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/*-------------------------------------------------------------------------
*
* execnodes.h
* definitions for executor state nodes
*
*
* Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/nodes/execnodes.h
*
*-------------------------------------------------------------------------
*/
#ifndef EXECNODES_H
#define EXECNODES_H
#include "access/genam.h"
#include "access/heapam.h"
#include "access/tupconvert.h"
#include "executor/instrument.h"
#include "lib/pairingheap.h"
#include "nodes/params.h"
#include "nodes/plannodes.h"
#include "utils/hsearch.h"
#include "utils/queryenvironment.h"
#include "utils/reltrigger.h"
#include "utils/sharedtuplestore.h"
#include "utils/sortsupport.h"
#include "utils/tuplestore.h"
#include "utils/tuplesort.h"
#include "nodes/tidbitmap.h"
#include "storage/condition_variable.h"
struct PlanState; /* forward references in this file */
struct ParallelHashJoinState;
struct ExprState;
struct ExprContext;
struct ExprEvalStep; /* avoid including execExpr.h everywhere */
/* ----------------
* ExprState node
*
* ExprState is the top-level node for expression evaluation.
* It contains instructions (in ->steps) to evaluate the expression.
* ----------------
*/
typedef Datum (*ExprStateEvalFunc) (struct ExprState *expression,
struct ExprContext *econtext,
bool *isNull);
/* Bits in ExprState->flags (see also execExpr.h for private flag bits): */
/* expression is for use with ExecQual() */
#define EEO_FLAG_IS_QUAL (1 << 0)
typedef struct ExprState
{
Node tag;
uint8 flags; /* bitmask of EEO_FLAG_* bits, see above */
/*
* Storage for result value of a scalar expression, or for individual
* column results within expressions built by ExecBuildProjectionInfo().
*/
#define FIELDNO_EXPRSTATE_RESNULL 2
bool resnull;
#define FIELDNO_EXPRSTATE_RESVALUE 3
Datum resvalue;
/*
* If projecting a tuple result, this slot holds the result; else NULL.
*/
#define FIELDNO_EXPRSTATE_RESULTSLOT 4
TupleTableSlot *resultslot;
/*
* Instructions to compute expression's return value.
*/
struct ExprEvalStep *steps;
/*
* Function that actually evaluates the expression. This can be set to
* different values depending on the complexity of the expression.
*/
ExprStateEvalFunc evalfunc;
/* original expression tree, for debugging only */
Expr *expr;
/* private state for an evalfunc */
void *evalfunc_private;
/*
* XXX: following fields only needed during "compilation" (ExecInitExpr);
* could be thrown away afterwards.
*/
int steps_len; /* number of steps currently */
int steps_alloc; /* allocated length of steps array */
struct PlanState *parent; /* parent PlanState node, if any */
ParamListInfo ext_params; /* for compiling PARAM_EXTERN nodes */
Datum *innermost_caseval;
bool *innermost_casenull;
Datum *innermost_domainval;
bool *innermost_domainnull;
} ExprState;
/* ----------------
* IndexInfo information
*
* this struct holds the information needed to construct new index
* entries for a particular index. Used for both index_build and
* retail creation of index entries.
*
* NumIndexAttrs total number of columns in this index
* NumIndexKeyAttrs number of key columns in index
* IndexAttrNumbers underlying-rel attribute numbers used as keys
* (zeroes indicate expressions). It also contains
* info about included columns.
* Expressions expr trees for expression entries, or NIL if none
* ExpressionsState exec state for expressions, or NIL if none
* Predicate partial-index predicate, or NIL if none
* PredicateState exec state for predicate, or NIL if none
* ExclusionOps Per-column exclusion operators, or NULL if none
* ExclusionProcs Underlying function OIDs for ExclusionOps
* ExclusionStrats Opclass strategy numbers for ExclusionOps
* UniqueOps Theses are like Exclusion*, but for unique indexes
* UniqueProcs
* UniqueStrats
* Unique is it a unique index?
* ReadyForInserts is it valid for inserts?
* Concurrent are we doing a concurrent index build?
* BrokenHotChain did we detect any broken HOT chains?
* ParallelWorkers # of workers requested (excludes leader)
* Am Oid of index AM
* AmCache private cache area for index AM
* Context memory context holding this IndexInfo
*
* ii_Concurrent, ii_BrokenHotChain, and ii_ParallelWorkers are used only
* during index build; they're conventionally zeroed otherwise.
* ----------------
*/
typedef struct IndexInfo
{
NodeTag type;
int ii_NumIndexAttrs; /* total number of columns in index */
int ii_NumIndexKeyAttrs; /* number of key columns in index */
AttrNumber ii_IndexAttrNumbers[INDEX_MAX_KEYS];
List *ii_Expressions; /* list of Expr */
List *ii_ExpressionsState; /* list of ExprState */
List *ii_Predicate; /* list of Expr */
ExprState *ii_PredicateState;
Oid *ii_ExclusionOps; /* array with one entry per column */
Oid *ii_ExclusionProcs; /* array with one entry per column */
uint16 *ii_ExclusionStrats; /* array with one entry per column */
Oid *ii_UniqueOps; /* array with one entry per column */
Oid *ii_UniqueProcs; /* array with one entry per column */
uint16 *ii_UniqueStrats; /* array with one entry per column */
bool ii_Unique;
bool ii_ReadyForInserts;
bool ii_Concurrent;
bool ii_BrokenHotChain;
int ii_ParallelWorkers;
Oid ii_Am;
void *ii_AmCache;
MemoryContext ii_Context;
} IndexInfo;
/* ----------------
* ExprContext_CB
*
* List of callbacks to be called at ExprContext shutdown.
* ----------------
*/
typedef void (*ExprContextCallbackFunction) (Datum arg);
typedef struct ExprContext_CB
{
struct ExprContext_CB *next;
ExprContextCallbackFunction function;
Datum arg;
} ExprContext_CB;
/* ----------------
* ExprContext
*
* This class holds the "current context" information
* needed to evaluate expressions for doing tuple qualifications
* and tuple projections. For example, if an expression refers
* to an attribute in the current inner tuple then we need to know
* what the current inner tuple is and so we look at the expression
* context.
*
* There are two memory contexts associated with an ExprContext:
* * ecxt_per_query_memory is a query-lifespan context, typically the same
* context the ExprContext node itself is allocated in. This context
* can be used for purposes such as storing function call cache info.
* * ecxt_per_tuple_memory is a short-term context for expression results.
* As the name suggests, it will typically be reset once per tuple,
* before we begin to evaluate expressions for that tuple. Each
* ExprContext normally has its very own per-tuple memory context.
*
* CurrentMemoryContext should be set to ecxt_per_tuple_memory before
* calling ExecEvalExpr() --- see ExecEvalExprSwitchContext().
* ----------------
*/
typedef struct ExprContext
{
NodeTag type;
/* Tuples that Var nodes in expression may refer to */
#define FIELDNO_EXPRCONTEXT_SCANTUPLE 1
TupleTableSlot *ecxt_scantuple;
#define FIELDNO_EXPRCONTEXT_INNERTUPLE 2
TupleTableSlot *ecxt_innertuple;
#define FIELDNO_EXPRCONTEXT_OUTERTUPLE 3
TupleTableSlot *ecxt_outertuple;
/* Memory contexts for expression evaluation --- see notes above */
MemoryContext ecxt_per_query_memory;
MemoryContext ecxt_per_tuple_memory;
/* Values to substitute for Param nodes in expression */
ParamExecData *ecxt_param_exec_vals; /* for PARAM_EXEC params */
ParamListInfo ecxt_param_list_info; /* for other param types */
/*
* Values to substitute for Aggref nodes in the expressions of an Agg
* node, or for WindowFunc nodes within a WindowAgg node.
*/
#define FIELDNO_EXPRCONTEXT_AGGVALUES 8
Datum *ecxt_aggvalues; /* precomputed values for aggs/windowfuncs */
#define FIELDNO_EXPRCONTEXT_AGGNULLS 9
bool *ecxt_aggnulls; /* null flags for aggs/windowfuncs */
/* Value to substitute for CaseTestExpr nodes in expression */
#define FIELDNO_EXPRCONTEXT_CASEDATUM 10
Datum caseValue_datum;
#define FIELDNO_EXPRCONTEXT_CASENULL 11
bool caseValue_isNull;
/* Value to substitute for CoerceToDomainValue nodes in expression */
#define FIELDNO_EXPRCONTEXT_DOMAINDATUM 12
Datum domainValue_datum;
#define FIELDNO_EXPRCONTEXT_DOMAINNULL 13
bool domainValue_isNull;
/* Link to containing EState (NULL if a standalone ExprContext) */
struct EState *ecxt_estate;
/* Functions to call back when ExprContext is shut down or rescanned */
ExprContext_CB *ecxt_callbacks;
} ExprContext;
/*
* Set-result status used when evaluating functions potentially returning a
* set.
*/
typedef enum
{
ExprSingleResult, /* expression does not return a set */
ExprMultipleResult, /* this result is an element of a set */
ExprEndResult /* there are no more elements in the set */
} ExprDoneCond;
/*
* Return modes for functions returning sets. Note values must be chosen
* as separate bits so that a bitmask can be formed to indicate supported
* modes. SFRM_Materialize_Random and SFRM_Materialize_Preferred are
* auxiliary flags about SFRM_Materialize mode, rather than separate modes.
*/
typedef enum
{
SFRM_ValuePerCall = 0x01, /* one value returned per call */
SFRM_Materialize = 0x02, /* result set instantiated in Tuplestore */
SFRM_Materialize_Random = 0x04, /* Tuplestore needs randomAccess */
SFRM_Materialize_Preferred = 0x08 /* caller prefers Tuplestore */
} SetFunctionReturnMode;
/*
* When calling a function that might return a set (multiple rows),
* a node of this type is passed as fcinfo->resultinfo to allow
* return status to be passed back. A function returning set should
* raise an error if no such resultinfo is provided.
*/
typedef struct ReturnSetInfo
{
NodeTag type;
/* values set by caller: */
ExprContext *econtext; /* context function is being called in */
TupleDesc expectedDesc; /* tuple descriptor expected by caller */
int allowedModes; /* bitmask: return modes caller can handle */
/* result status from function (but pre-initialized by caller): */
SetFunctionReturnMode returnMode; /* actual return mode */
ExprDoneCond isDone; /* status for ValuePerCall mode */
/* fields filled by function in Materialize return mode: */
Tuplestorestate *setResult; /* holds the complete returned tuple set */
TupleDesc setDesc; /* actual descriptor for returned tuples */
} ReturnSetInfo;
/* ----------------
* ProjectionInfo node information
*
* This is all the information needed to perform projections ---
* that is, form new tuples by evaluation of targetlist expressions.
* Nodes which need to do projections create one of these.
*
* The target tuple slot is kept in ProjectionInfo->pi_state.resultslot.
* ExecProject() evaluates the tlist, forms a tuple, and stores it
* in the given slot. Note that the result will be a "virtual" tuple
* unless ExecMaterializeSlot() is then called to force it to be
* converted to a physical tuple. The slot must have a tupledesc
* that matches the output of the tlist!
* ----------------
*/
typedef struct ProjectionInfo
{
NodeTag type;
/* instructions to evaluate projection */
ExprState pi_state;
/* expression context in which to evaluate expression */
ExprContext *pi_exprContext;
} ProjectionInfo;
/* ----------------
* JunkFilter
*
* This class is used to store information regarding junk attributes.
* A junk attribute is an attribute in a tuple that is needed only for
* storing intermediate information in the executor, and does not belong
* in emitted tuples. For example, when we do an UPDATE query,
* the planner adds a "junk" entry to the targetlist so that the tuples
* returned to ExecutePlan() contain an extra attribute: the ctid of
* the tuple to be updated. This is needed to do the update, but we
* don't want the ctid to be part of the stored new tuple! So, we
* apply a "junk filter" to remove the junk attributes and form the
* real output tuple. The junkfilter code also provides routines to
* extract the values of the junk attribute(s) from the input tuple.
*
* targetList: the original target list (including junk attributes).
* cleanTupType: the tuple descriptor for the "clean" tuple (with
* junk attributes removed).
* cleanMap: A map with the correspondence between the non-junk
* attribute numbers of the "original" tuple and the
* attribute numbers of the "clean" tuple.
* resultSlot: tuple slot used to hold cleaned tuple.
* junkAttNo: not used by junkfilter code. Can be used by caller
* to remember the attno of a specific junk attribute
* (nodeModifyTable.c keeps the "ctid" or "wholerow"
* attno here).
* ----------------
*/
typedef struct JunkFilter
{
NodeTag type;
List *jf_targetList;
TupleDesc jf_cleanTupType;
AttrNumber *jf_cleanMap;
TupleTableSlot *jf_resultSlot;
AttrNumber jf_junkAttNo;
} JunkFilter;
/*
* OnConflictSetState
*
* Executor state of an ON CONFLICT DO UPDATE operation.
*/
typedef struct OnConflictSetState
{
NodeTag type;
ProjectionInfo *oc_ProjInfo; /* for ON CONFLICT DO UPDATE SET */
TupleDesc oc_ProjTupdesc; /* TupleDesc for the above projection */
ExprState *oc_WhereClause; /* state for the WHERE clause */
} OnConflictSetState;
/*
* ResultRelInfo
*
* Whenever we update an existing relation, we have to update indexes on the
* relation, and perhaps also fire triggers. ResultRelInfo holds all the
* information needed about a result relation, including indexes.
*/
typedef struct ResultRelInfo
{
NodeTag type;
/* result relation's range table index */
Index ri_RangeTableIndex;
/* relation descriptor for result relation */
Relation ri_RelationDesc;
/* # of indices existing on result relation */
int ri_NumIndices;
/* array of relation descriptors for indices */
RelationPtr ri_IndexRelationDescs;
/* array of key/attr info for indices */
IndexInfo **ri_IndexRelationInfo;
/* triggers to be fired, if any */
TriggerDesc *ri_TrigDesc;
/* cached lookup info for trigger functions */
FmgrInfo *ri_TrigFunctions;
/* array of trigger WHEN expr states */
ExprState **ri_TrigWhenExprs;
/* optional runtime measurements for triggers */
Instrumentation *ri_TrigInstrument;
/* FDW callback functions, if foreign table */
struct FdwRoutine *ri_FdwRoutine;
/* available to save private state of FDW */
void *ri_FdwState;
/* true when modifying foreign table directly */
bool ri_usesFdwDirectModify;
/* list of WithCheckOption's to be checked */
List *ri_WithCheckOptions;
/* list of WithCheckOption expr states */
List *ri_WithCheckOptionExprs;
/* array of constraint-checking expr states */
ExprState **ri_ConstraintExprs;
/* for removing junk attributes from tuples */
JunkFilter *ri_junkFilter;
/* list of RETURNING expressions */
List *ri_returningList;
/* for computing a RETURNING list */
ProjectionInfo *ri_projectReturning;
/* list of arbiter indexes to use to check conflicts */
List *ri_onConflictArbiterIndexes;
/* ON CONFLICT evaluation state */
OnConflictSetState *ri_onConflict;
/* partition check expression */
List *ri_PartitionCheck;
/* partition check expression state */
ExprState *ri_PartitionCheckExpr;
/*
* RootResultRelInfo gives the target relation mentioned in the query, if
* it's a partitioned table. It is not set if the target relation
* mentioned in the query is an inherited table, nor when tuple routing is
* not needed.
*/
struct ResultRelInfo *ri_RootResultRelInfo;
/* true if ready for tuple routing */
bool ri_PartitionReadyForRouting;
} ResultRelInfo;
/* ----------------
* EState information
*
* Master working state for an Executor invocation
* ----------------
*/
typedef struct EState
{
NodeTag type;
/* Basic state for all query types: */
ScanDirection es_direction; /* current scan direction */
Snapshot es_snapshot; /* time qual to use */
Snapshot es_crosscheck_snapshot; /* crosscheck time qual for RI */
List *es_range_table; /* List of RangeTblEntry */
PlannedStmt *es_plannedstmt; /* link to top of plan tree */
const char *es_sourceText; /* Source text from QueryDesc */
JunkFilter *es_junkFilter; /* top-level junk filter, if any */
/* If query can insert/delete tuples, the command ID to mark them with */
CommandId es_output_cid;
/* Info about target table(s) for insert/update/delete queries: */
ResultRelInfo *es_result_relations; /* array of ResultRelInfos */
int es_num_result_relations; /* length of array */
ResultRelInfo *es_result_relation_info; /* currently active array elt */
/*
* Info about the target partitioned target table root(s) for
* update/delete queries. They required only to fire any per-statement
* triggers defined on the table. It exists separately from
* es_result_relations, because partitioned tables don't appear in the
* plan tree for the update/delete cases.
*/
ResultRelInfo *es_root_result_relations; /* array of ResultRelInfos */
int es_num_root_result_relations; /* length of the array */
/*
* The following list contains ResultRelInfos created by the tuple routing
* code for partitions that don't already have one.
*/
List *es_tuple_routing_result_relations;
/* Stuff used for firing triggers: */
List *es_trig_target_relations; /* trigger-only ResultRelInfos */
TupleTableSlot *es_trig_tuple_slot; /* for trigger output tuples */
TupleTableSlot *es_trig_oldtup_slot; /* for TriggerEnabled */
TupleTableSlot *es_trig_newtup_slot; /* for TriggerEnabled */
/* Parameter info: */
ParamListInfo es_param_list_info; /* values of external params */
ParamExecData *es_param_exec_vals; /* values of internal params */
QueryEnvironment *es_queryEnv; /* query environment */
/* Other working state: */
MemoryContext es_query_cxt; /* per-query context in which EState lives */
List *es_tupleTable; /* List of TupleTableSlots */
List *es_rowMarks; /* List of ExecRowMarks */
uint64 es_processed; /* # of tuples processed */
Oid es_lastoid; /* last oid processed (by INSERT) */
int es_top_eflags; /* eflags passed to ExecutorStart */
int es_instrument; /* OR of InstrumentOption flags */
bool es_finished; /* true when ExecutorFinish is done */
List *es_exprcontexts; /* List of ExprContexts within EState */
List *es_subplanstates; /* List of PlanState for SubPlans */
List *es_auxmodifytables; /* List of secondary ModifyTableStates */
/*
* this ExprContext is for per-output-tuple operations, such as constraint
* checks and index-value computations. It will be reset for each output
* tuple. Note that it will be created only if needed.
*/
ExprContext *es_per_tuple_exprcontext;
/*
* These fields are for re-evaluating plan quals when an updated tuple is
* substituted in READ COMMITTED mode. es_epqTuple[] contains tuples that
* scan plan nodes should return instead of whatever they'd normally
* return, or NULL if nothing to return; es_epqTupleSet[] is true if a
* particular array entry is valid; and es_epqScanDone[] is state to
* remember if the tuple has been returned already. Arrays are of size
* list_length(es_range_table) and are indexed by scan node scanrelid - 1.
*/
HeapTuple *es_epqTuple; /* array of EPQ substitute tuples */
bool *es_epqTupleSet; /* true if EPQ tuple is provided */
bool *es_epqScanDone; /* true if EPQ tuple has been fetched */
bool es_use_parallel_mode; /* can we use parallel workers? */
/* The per-query shared memory area to use for parallel execution. */
struct dsa_area *es_query_dsa;
/*
* JIT information. es_jit_flags indicates whether JIT should be performed
* and with which options. es_jit is created on-demand when JITing is
* performed.
*
* es_jit_combined_instr is the the combined, on demand allocated,
* instrumentation from all workers. The leader's instrumentation is kept
* separate, and is combined on demand by ExplainPrintJITSummary().
*/
int es_jit_flags;
struct JitContext *es_jit;
struct JitInstrumentation *es_jit_worker_instr;
} EState;
/*
* ExecRowMark -
* runtime representation of FOR [KEY] UPDATE/SHARE clauses
*
* When doing UPDATE, DELETE, or SELECT FOR [KEY] UPDATE/SHARE, we will have an
* ExecRowMark for each non-target relation in the query (except inheritance
* parent RTEs, which can be ignored at runtime). Virtual relations such as
* subqueries-in-FROM will have an ExecRowMark with relation == NULL. See
* PlanRowMark for details about most of the fields. In addition to fields
* directly derived from PlanRowMark, we store an activity flag (to denote
* inactive children of inheritance trees), curCtid, which is used by the
* WHERE CURRENT OF code, and ermExtra, which is available for use by the plan
* node that sources the relation (e.g., for a foreign table the FDW can use
* ermExtra to hold information).
*
* EState->es_rowMarks is a list of these structs.
*/
typedef struct ExecRowMark
{
Relation relation; /* opened and suitably locked relation */
Oid relid; /* its OID (or InvalidOid, if subquery) */
Index rti; /* its range table index */
Index prti; /* parent range table index, if child */
Index rowmarkId; /* unique identifier for resjunk columns */
RowMarkType markType; /* see enum in nodes/plannodes.h */
LockClauseStrength strength; /* LockingClause's strength, or LCS_NONE */
LockWaitPolicy waitPolicy; /* NOWAIT and SKIP LOCKED */
bool ermActive; /* is this mark relevant for current tuple? */
ItemPointerData curCtid; /* ctid of currently locked tuple, if any */
void *ermExtra; /* available for use by relation source node */
} ExecRowMark;
/*
* ExecAuxRowMark -
* additional runtime representation of FOR [KEY] UPDATE/SHARE clauses
*
* Each LockRows and ModifyTable node keeps a list of the rowmarks it needs to
* deal with. In addition to a pointer to the related entry in es_rowMarks,
* this struct carries the column number(s) of the resjunk columns associated
* with the rowmark (see comments for PlanRowMark for more detail). In the
* case of ModifyTable, there has to be a separate ExecAuxRowMark list for
* each child plan, because the resjunk columns could be at different physical
* column positions in different subplans.
*/
typedef struct ExecAuxRowMark
{
ExecRowMark *rowmark; /* related entry in es_rowMarks */
AttrNumber ctidAttNo; /* resno of ctid junk attribute, if any */
AttrNumber toidAttNo; /* resno of tableoid junk attribute, if any */
AttrNumber wholeAttNo; /* resno of whole-row junk attribute, if any */
} ExecAuxRowMark;
/* ----------------------------------------------------------------
* Tuple Hash Tables
*
* All-in-memory tuple hash tables are used for a number of purposes.
*
* Note: tab_hash_funcs are for the key datatype(s) stored in the table,
* and tab_eq_funcs are non-cross-type equality operators for those types.
* Normally these are the only functions used, but FindTupleHashEntry()
* supports searching a hashtable using cross-data-type hashing. For that,
* the caller must supply hash functions for the LHS datatype as well as
* the cross-type equality operators to use. in_hash_funcs and cur_eq_func
* are set to point to the caller's function arrays while doing such a search.
* During LookupTupleHashEntry(), they point to tab_hash_funcs and
* tab_eq_func respectively.
* ----------------------------------------------------------------
*/
typedef struct TupleHashEntryData *TupleHashEntry;
typedef struct TupleHashTableData *TupleHashTable;
typedef struct TupleHashEntryData
{
MinimalTuple firstTuple; /* copy of first tuple in this group */
void *additional; /* user data */
uint32 status; /* hash status */
uint32 hash; /* hash value (cached) */
} TupleHashEntryData;
/* define parameters necessary to generate the tuple hash table interface */
#define SH_PREFIX tuplehash
#define SH_ELEMENT_TYPE TupleHashEntryData
#define SH_KEY_TYPE MinimalTuple
#define SH_SCOPE extern
#define SH_DECLARE
#include "lib/simplehash.h"
typedef struct TupleHashTableData
{
tuplehash_hash *hashtab; /* underlying hash table */
int numCols; /* number of columns in lookup key */
AttrNumber *keyColIdx; /* attr numbers of key columns */
FmgrInfo *tab_hash_funcs; /* hash functions for table datatype(s) */
ExprState *tab_eq_func; /* comparator for table datatype(s) */
MemoryContext tablecxt; /* memory context containing table */
MemoryContext tempcxt; /* context for function evaluations */
Size entrysize; /* actual size to make each hash entry */
TupleTableSlot *tableslot; /* slot for referencing table entries */
/* The following fields are set transiently for each table search: */
TupleTableSlot *inputslot; /* current input tuple's slot */
FmgrInfo *in_hash_funcs; /* hash functions for input datatype(s) */
ExprState *cur_eq_func; /* comparator for input vs. table */
uint32 hash_iv; /* hash-function IV */
ExprContext *exprcontext; /* expression context */
} TupleHashTableData;
typedef tuplehash_iterator TupleHashIterator;
/*
* Use InitTupleHashIterator/TermTupleHashIterator for a read/write scan.
* Use ResetTupleHashIterator if the table can be frozen (in this case no
* explicit scan termination is needed).
*/
#define InitTupleHashIterator(htable, iter) \
tuplehash_start_iterate(htable->hashtab, iter)
#define TermTupleHashIterator(iter) \
((void) 0)
#define ResetTupleHashIterator(htable, iter) \
InitTupleHashIterator(htable, iter)
#define ScanTupleHashTable(htable, iter) \
tuplehash_iterate(htable->hashtab, iter)
/* ----------------------------------------------------------------
* Expression State Nodes
*
* Formerly, there was a separate executor expression state node corresponding
* to each node in a planned expression tree. That's no longer the case; for
* common expression node types, all the execution info is embedded into
* step(s) in a single ExprState node. But we still have a few executor state
* node types for selected expression node types, mostly those in which info
* has to be shared with other parts of the execution state tree.
* ----------------------------------------------------------------
*/
/* ----------------
* AggrefExprState node
* ----------------
*/
typedef struct AggrefExprState
{
NodeTag type;
Aggref *aggref; /* expression plan node */
int aggno; /* ID number for agg within its plan node */
} AggrefExprState;
/* ----------------
* WindowFuncExprState node
* ----------------
*/
typedef struct WindowFuncExprState
{
NodeTag type;
WindowFunc *wfunc; /* expression plan node */
List *args; /* ExprStates for argument expressions */
ExprState *aggfilter; /* FILTER expression */
int wfuncno; /* ID number for wfunc within its plan node */
} WindowFuncExprState;
/* ----------------
* SetExprState node
*
* State for evaluating a potentially set-returning expression (like FuncExpr
* or OpExpr). In some cases, like some of the expressions in ROWS FROM(...)
* the expression might not be a SRF, but nonetheless it uses the same
* machinery as SRFs; it will be treated as a SRF returning a single row.
* ----------------
*/
typedef struct SetExprState
{
NodeTag type;
Expr *expr; /* expression plan node */
List *args; /* ExprStates for argument expressions */
/*
* In ROWS FROM, functions can be inlined, removing the FuncExpr normally
* inside. In such a case this is the compiled expression (which cannot
* return a set), which'll be evaluated using regular ExecEvalExpr().
*/
ExprState *elidedFuncState;
/*
* Function manager's lookup info for the target function. If func.fn_oid
* is InvalidOid, we haven't initialized it yet (nor any of the following
* fields, except funcReturnsSet).
*/
FmgrInfo func;
/*
* For a set-returning function (SRF) that returns a tuplestore, we keep
* the tuplestore here and dole out the result rows one at a time. The
* slot holds the row currently being returned.
*/
Tuplestorestate *funcResultStore;
TupleTableSlot *funcResultSlot;
/*
* In some cases we need to compute a tuple descriptor for the function's
* output. If so, it's stored here.
*/
TupleDesc funcResultDesc;
bool funcReturnsTuple; /* valid when funcResultDesc isn't NULL */
/*
* Remember whether the function is declared to return a set. This is set
* by ExecInitExpr, and is valid even before the FmgrInfo is set up.
*/
bool funcReturnsSet;
/*
* setArgsValid is true when we are evaluating a set-returning function
* that uses value-per-call mode and we are in the middle of a call
* series; we want to pass the same argument values to the function again
* (and again, until it returns ExprEndResult). This indicates that
* fcinfo_data already contains valid argument data.
*/
bool setArgsValid;
/*
* Flag to remember whether we have registered a shutdown callback for
* this SetExprState. We do so only if funcResultStore or setArgsValid
* has been set at least once (since all the callback is for is to release
* the tuplestore or clear setArgsValid).
*/
bool shutdown_reg; /* a shutdown callback is registered */
/*
* Call parameter structure for the function. This has been initialized
* (by InitFunctionCallInfoData) if func.fn_oid is valid. It also saves
* argument values between calls, when setArgsValid is true.
*/
FunctionCallInfoData fcinfo_data;
} SetExprState;
/* ----------------
* SubPlanState node
* ----------------
*/
typedef struct SubPlanState
{
NodeTag type;
SubPlan *subplan; /* expression plan node */
struct PlanState *planstate; /* subselect plan's state tree */
struct PlanState *parent; /* parent plan node's state tree */
ExprState *testexpr; /* state of combining expression */
List *args; /* states of argument expression(s) */
HeapTuple curTuple; /* copy of most recent tuple from subplan */
Datum curArray; /* most recent array from ARRAY() subplan */
/* these are used when hashing the subselect's output: */
TupleDesc descRight; /* subselect desc after projection */
ProjectionInfo *projLeft; /* for projecting lefthand exprs */
ProjectionInfo *projRight; /* for projecting subselect output */
TupleHashTable hashtable; /* hash table for no-nulls subselect rows */
TupleHashTable hashnulls; /* hash table for rows with null(s) */
bool havehashrows; /* true if hashtable is not empty */
bool havenullrows; /* true if hashnulls is not empty */
MemoryContext hashtablecxt; /* memory context containing hash tables */
MemoryContext hashtempcxt; /* temp memory context for hash tables */
ExprContext *innerecontext; /* econtext for computing inner tuples */
/* each of the following fields is an array of length numCols: */
AttrNumber *keyColIdx; /* control data for hash tables */
Oid *tab_eq_funcoids; /* equality func oids for table
* datatype(s) */
FmgrInfo *tab_hash_funcs; /* hash functions for table datatype(s) */
FmgrInfo *tab_eq_funcs; /* equality functions for table datatype(s) */
FmgrInfo *lhs_hash_funcs; /* hash functions for lefthand datatype(s) */
FmgrInfo *cur_eq_funcs; /* equality functions for LHS vs. table */
ExprState *cur_eq_comp; /* equality comparator for LHS vs. table */
int numCols; /* number of columns being hashed */
} SubPlanState;
/* ----------------
* AlternativeSubPlanState node
* ----------------
*/
typedef struct AlternativeSubPlanState
{
NodeTag type;
AlternativeSubPlan *subplan; /* expression plan node */
List *subplans; /* SubPlanStates of alternative subplans */
int active; /* list index of the one we're using */
} AlternativeSubPlanState;
/*
* DomainConstraintState - one item to check during CoerceToDomain
*
* Note: we consider this to be part of an ExprState tree, so we give it
* a name following the xxxState convention. But there's no directly
* associated plan-tree node.
*/
typedef enum DomainConstraintType
{
DOM_CONSTRAINT_NOTNULL,
DOM_CONSTRAINT_CHECK
} DomainConstraintType;
typedef struct DomainConstraintState
{
NodeTag type;
DomainConstraintType constrainttype; /* constraint type */
char *name; /* name of constraint (for error msgs) */
Expr *check_expr; /* for CHECK, a boolean expression */
ExprState *check_exprstate; /* check_expr's eval state, or NULL */
} DomainConstraintState;
/* ----------------------------------------------------------------
* Executor State Trees
*
* An executing query has a PlanState tree paralleling the Plan tree
* that describes the plan.
* ----------------------------------------------------------------
*/
/* ----------------
* ExecProcNodeMtd
*
* This is the method called by ExecProcNode to return the next tuple
* from an executor node. It returns NULL, or an empty TupleTableSlot,
* if no more tuples are available.
* ----------------
*/
typedef TupleTableSlot *(*ExecProcNodeMtd) (struct PlanState *pstate);
/* ----------------
* PlanState node
*
* We never actually instantiate any PlanState nodes; this is just the common
* abstract superclass for all PlanState-type nodes.
* ----------------
*/
typedef struct PlanState
{
NodeTag type;
Plan *plan; /* associated Plan node */
EState *state; /* at execution time, states of individual
* nodes point to one EState for the whole
* top-level plan */
ExecProcNodeMtd ExecProcNode; /* function to return next tuple */
ExecProcNodeMtd ExecProcNodeReal; /* actual function, if above is a
* wrapper */
Instrumentation *instrument; /* Optional runtime stats for this node */
WorkerInstrumentation *worker_instrument; /* per-worker instrumentation */
/* Per-worker JIT instrumentation */
struct SharedJitInstrumentation *worker_jit_instrument;
/*
* Common structural data for all Plan types. These links to subsidiary
* state trees parallel links in the associated plan tree (except for the
* subPlan list, which does not exist in the plan tree).
*/
ExprState *qual; /* boolean qual condition */
struct PlanState *lefttree; /* input plan tree(s) */
struct PlanState *righttree;
List *initPlan; /* Init SubPlanState nodes (un-correlated expr
* subselects) */
List *subPlan; /* SubPlanState nodes in my expressions */
/*
* State for management of parameter-change-driven rescanning
*/
Bitmapset *chgParam; /* set of IDs of changed Params */
/*
* Other run-time state needed by most if not all node types.
*/
TupleTableSlot *ps_ResultTupleSlot; /* slot for my result tuples */
ExprContext *ps_ExprContext; /* node's expression-evaluation context */
ProjectionInfo *ps_ProjInfo; /* info for doing tuple projection */
/*
* Scanslot's descriptor if known. This is a bit of a hack, but otherwise
* it's hard for expression compilation to optimize based on the
* descriptor, without encoding knowledge about all executor nodes.
*/
TupleDesc scandesc;
} PlanState;
/* ----------------
* these are defined to avoid confusion problems with "left"
* and "right" and "inner" and "outer". The convention is that
* the "left" plan is the "outer" plan and the "right" plan is
* the inner plan, but these make the code more readable.
* ----------------
*/
#define innerPlanState(node) (((PlanState *)(node))->righttree)
#define outerPlanState(node) (((PlanState *)(node))->lefttree)
/* Macros for inline access to certain instrumentation counters */
#define InstrCountTuples2(node, delta) \
do { \
if (((PlanState *)(node))->instrument) \
((PlanState *)(node))->instrument->ntuples2 += (delta); \
} while (0)
#define InstrCountFiltered1(node, delta) \
do { \
if (((PlanState *)(node))->instrument) \
((PlanState *)(node))->instrument->nfiltered1 += (delta); \
} while(0)
#define InstrCountFiltered2(node, delta) \
do { \
if (((PlanState *)(node))->instrument) \
((PlanState *)(node))->instrument->nfiltered2 += (delta); \
} while(0)
/*
* EPQState is state for executing an EvalPlanQual recheck on a candidate
* tuple in ModifyTable or LockRows. The estate and planstate fields are
* NULL if inactive.
*/
typedef struct EPQState
{
EState *estate; /* subsidiary EState */
PlanState *planstate; /* plan state tree ready to be executed */
TupleTableSlot *origslot; /* original output tuple to be rechecked */
Plan *plan; /* plan tree to be executed */
List *arowMarks; /* ExecAuxRowMarks (non-locking only) */
int epqParam; /* ID of Param to force scan node re-eval */
} EPQState;
/* ----------------
* ResultState information
* ----------------
*/
typedef struct ResultState
{
PlanState ps; /* its first field is NodeTag */
ExprState *resconstantqual;
bool rs_done; /* are we done? */
bool rs_checkqual; /* do we need to check the qual? */
} ResultState;
/* ----------------
* ProjectSetState information
*
* Note: at least one of the "elems" will be a SetExprState; the rest are
* regular ExprStates.
* ----------------
*/
typedef struct ProjectSetState
{
PlanState ps; /* its first field is NodeTag */
Node **elems; /* array of expression states */
ExprDoneCond *elemdone; /* array of per-SRF is-done states */
int nelems; /* length of elemdone[] array */
bool pending_srf_tuples; /* still evaluating srfs in tlist? */
MemoryContext argcontext; /* context for SRF arguments */
} ProjectSetState;
/* ----------------
* ModifyTableState information
* ----------------
*/
typedef struct ModifyTableState
{
PlanState ps; /* its first field is NodeTag */
CmdType operation; /* INSERT, UPDATE, or DELETE */
bool canSetTag; /* do we set the command tag/es_processed? */
bool mt_done; /* are we done? */
PlanState **mt_plans; /* subplans (one per target rel) */
int mt_nplans; /* number of plans in the array */
int mt_whichplan; /* which one is being executed (0..n-1) */
ResultRelInfo *resultRelInfo; /* per-subplan target relations */
ResultRelInfo *rootResultRelInfo; /* root target relation (partitioned
* table root) */
List **mt_arowmarks; /* per-subplan ExecAuxRowMark lists */
EPQState mt_epqstate; /* for evaluating EvalPlanQual rechecks */
bool fireBSTriggers; /* do we need to fire stmt triggers? */
TupleTableSlot *mt_existing; /* slot to store existing target tuple in */
List *mt_excludedtlist; /* the excluded pseudo relation's tlist */
TupleTableSlot *mt_conflproj; /* CONFLICT ... SET ... projection target */
/* Tuple-routing support info */
struct PartitionTupleRouting *mt_partition_tuple_routing;
/* controls transition table population for specified operation */
struct TransitionCaptureState *mt_transition_capture;
/* controls transition table population for INSERT...ON CONFLICT UPDATE */
struct TransitionCaptureState *mt_oc_transition_capture;
/* Per plan map for tuple conversion from child to root */
TupleConversionMap **mt_per_subplan_tupconv_maps;
} ModifyTableState;
/* ----------------
* AppendState information
*
* nplans how many plans are in the array
* whichplan which plan is being executed (0 .. n-1), or a
* special negative value. See nodeAppend.c.
* prune_state details required to allow partitions to be
* eliminated from the scan, or NULL if not possible.
* valid_subplans for runtime pruning, valid appendplans indexes to
* scan.
* ----------------
*/
struct AppendState;
typedef struct AppendState AppendState;
struct ParallelAppendState;
typedef struct ParallelAppendState ParallelAppendState;
struct PartitionPruneState;
struct AppendState
{
PlanState ps; /* its first field is NodeTag */
PlanState **appendplans; /* array of PlanStates for my inputs */
int as_nplans;
int as_whichplan;
int as_first_partial_plan; /* Index of 'appendplans' containing
* the first partial plan */
ParallelAppendState *as_pstate; /* parallel coordination info */
Size pstate_len; /* size of parallel coordination info */
struct PartitionPruneState *as_prune_state;
Bitmapset *as_valid_subplans;
bool (*choose_next_subplan) (AppendState *);
};
/* ----------------
* MergeAppendState information
*
* nplans how many plans are in the array
* nkeys number of sort key columns
* sortkeys sort keys in SortSupport representation
* slots current output tuple of each subplan
* heap heap of active tuples
* initialized true if we have fetched first tuple from each subplan
* ----------------
*/
typedef struct MergeAppendState
{
PlanState ps; /* its first field is NodeTag */
PlanState **mergeplans; /* array of PlanStates for my inputs */
int ms_nplans;
int ms_nkeys;
SortSupport ms_sortkeys; /* array of length ms_nkeys */
TupleTableSlot **ms_slots; /* array of length ms_nplans */
struct binaryheap *ms_heap; /* binary heap of slot indices */
bool ms_initialized; /* are subplans started? */
} MergeAppendState;
/* ----------------
* RecursiveUnionState information
*
* RecursiveUnionState is used for performing a recursive union.
*
* recursing T when we're done scanning the non-recursive term
* intermediate_empty T if intermediate_table is currently empty
* working_table working table (to be scanned by recursive term)
* intermediate_table current recursive output (next generation of WT)
* ----------------
*/
typedef struct RecursiveUnionState
{
PlanState ps; /* its first field is NodeTag */
bool recursing;
bool intermediate_empty;
Tuplestorestate *working_table;
Tuplestorestate *intermediate_table;
/* Remaining fields are unused in UNION ALL case */
Oid *eqfuncoids; /* per-grouping-field equality fns */
FmgrInfo *hashfunctions; /* per-grouping-field hash fns */
MemoryContext tempContext; /* short-term context for comparisons */
TupleHashTable hashtable; /* hash table for tuples already seen */
MemoryContext tableContext; /* memory context containing hash table */
} RecursiveUnionState;
/* ----------------
* BitmapAndState information
* ----------------
*/
typedef struct BitmapAndState
{
PlanState ps; /* its first field is NodeTag */
PlanState **bitmapplans; /* array of PlanStates for my inputs */
int nplans; /* number of input plans */
} BitmapAndState;
/* ----------------
* BitmapOrState information
* ----------------
*/
typedef struct BitmapOrState
{
PlanState ps; /* its first field is NodeTag */
PlanState **bitmapplans; /* array of PlanStates for my inputs */
int nplans; /* number of input plans */
} BitmapOrState;
/* ----------------------------------------------------------------
* Scan State Information
* ----------------------------------------------------------------
*/
/* ----------------
* ScanState information
*
* ScanState extends PlanState for node types that represent
* scans of an underlying relation. It can also be used for nodes
* that scan the output of an underlying plan node --- in that case,
* only ScanTupleSlot is actually useful, and it refers to the tuple
* retrieved from the subplan.
*
* currentRelation relation being scanned (NULL if none)
* currentScanDesc current scan descriptor for scan (NULL if none)
* ScanTupleSlot pointer to slot in tuple table holding scan tuple
* ----------------
*/
typedef struct ScanState
{
PlanState ps; /* its first field is NodeTag */
Relation ss_currentRelation;
HeapScanDesc ss_currentScanDesc;
TupleTableSlot *ss_ScanTupleSlot;
} ScanState;
/* ----------------
* SeqScanState information
* ----------------
*/
typedef struct SeqScanState
{
ScanState ss; /* its first field is NodeTag */
Size pscan_len; /* size of parallel heap scan descriptor */
} SeqScanState;
/* ----------------
* SampleScanState information
* ----------------
*/
typedef struct SampleScanState
{
ScanState ss;
List *args; /* expr states for TABLESAMPLE params */
ExprState *repeatable; /* expr state for REPEATABLE expr */
/* use struct pointer to avoid including tsmapi.h here */
struct TsmRoutine *tsmroutine; /* descriptor for tablesample method */
void *tsm_state; /* tablesample method can keep state here */
bool use_bulkread; /* use bulkread buffer access strategy? */
bool use_pagemode; /* use page-at-a-time visibility checking? */
bool begun; /* false means need to call BeginSampleScan */
uint32 seed; /* random seed */
} SampleScanState;
/*
* These structs store information about index quals that don't have simple
* constant right-hand sides. See comments for ExecIndexBuildScanKeys()
* for discussion.
*/
typedef struct
{
ScanKey scan_key; /* scankey to put value into */
ExprState *key_expr; /* expr to evaluate to get value */
bool key_toastable; /* is expr's result a toastable datatype? */
} IndexRuntimeKeyInfo;
typedef struct
{
ScanKey scan_key; /* scankey to put value into */
ExprState *array_expr; /* expr to evaluate to get array value */
int next_elem; /* next array element to use */
int num_elems; /* number of elems in current array value */
Datum *elem_values; /* array of num_elems Datums */
bool *elem_nulls; /* array of num_elems is-null flags */
} IndexArrayKeyInfo;
/* ----------------
* IndexScanState information
*
* indexqualorig execution state for indexqualorig expressions
* indexorderbyorig execution state for indexorderbyorig expressions
* ScanKeys Skey structures for index quals
* NumScanKeys number of ScanKeys
* OrderByKeys Skey structures for index ordering operators
* NumOrderByKeys number of OrderByKeys
* RuntimeKeys info about Skeys that must be evaluated at runtime
* NumRuntimeKeys number of RuntimeKeys
* RuntimeKeysReady true if runtime Skeys have been computed
* RuntimeContext expr context for evaling runtime Skeys
* RelationDesc index relation descriptor
* ScanDesc index scan descriptor
*
* ReorderQueue tuples that need reordering due to re-check
* ReachedEnd have we fetched all tuples from index already?
* OrderByValues values of ORDER BY exprs of last fetched tuple
* OrderByNulls null flags for OrderByValues
* SortSupport for reordering ORDER BY exprs
* OrderByTypByVals is the datatype of order by expression pass-by-value?
* OrderByTypLens typlens of the datatypes of order by expressions
* pscan_len size of parallel index scan descriptor
* ----------------
*/
typedef struct IndexScanState
{
ScanState ss; /* its first field is NodeTag */
ExprState *indexqualorig;
List *indexorderbyorig;
ScanKey iss_ScanKeys;
int iss_NumScanKeys;
ScanKey iss_OrderByKeys;
int iss_NumOrderByKeys;
IndexRuntimeKeyInfo *iss_RuntimeKeys;
int iss_NumRuntimeKeys;
bool iss_RuntimeKeysReady;
ExprContext *iss_RuntimeContext;
Relation iss_RelationDesc;
IndexScanDesc iss_ScanDesc;
/* These are needed for re-checking ORDER BY expr ordering */
pairingheap *iss_ReorderQueue;
bool iss_ReachedEnd;
Datum *iss_OrderByValues;
bool *iss_OrderByNulls;
SortSupport iss_SortSupport;
bool *iss_OrderByTypByVals;
int16 *iss_OrderByTypLens;
Size iss_PscanLen;
} IndexScanState;
/* ----------------
* IndexOnlyScanState information
*
* recheckqual execution state for recheckqual expressions
* ScanKeys Skey structures for index quals
* NumScanKeys number of ScanKeys
* OrderByKeys Skey structures for index ordering operators
* NumOrderByKeys number of OrderByKeys
* RuntimeKeys info about Skeys that must be evaluated at runtime
* NumRuntimeKeys number of RuntimeKeys
* RuntimeKeysReady true if runtime Skeys have been computed
* RuntimeContext expr context for evaling runtime Skeys
* RelationDesc index relation descriptor
* ScanDesc index scan descriptor
* VMBuffer buffer in use for visibility map testing, if any
* ioss_PscanLen Size of parallel index-only scan descriptor
* ----------------
*/
typedef struct IndexOnlyScanState
{
ScanState ss; /* its first field is NodeTag */
ExprState *recheckqual;
ScanKey ioss_ScanKeys;
int ioss_NumScanKeys;
ScanKey ioss_OrderByKeys;
int ioss_NumOrderByKeys;
IndexRuntimeKeyInfo *ioss_RuntimeKeys;
int ioss_NumRuntimeKeys;
bool ioss_RuntimeKeysReady;
ExprContext *ioss_RuntimeContext;
Relation ioss_RelationDesc;
IndexScanDesc ioss_ScanDesc;
Buffer ioss_VMBuffer;
Size ioss_PscanLen;
} IndexOnlyScanState;
/* ----------------
* BitmapIndexScanState information
*
* result bitmap to return output into, or NULL
* ScanKeys Skey structures for index quals
* NumScanKeys number of ScanKeys
* RuntimeKeys info about Skeys that must be evaluated at runtime
* NumRuntimeKeys number of RuntimeKeys
* ArrayKeys info about Skeys that come from ScalarArrayOpExprs
* NumArrayKeys number of ArrayKeys
* RuntimeKeysReady true if runtime Skeys have been computed
* RuntimeContext expr context for evaling runtime Skeys
* RelationDesc index relation descriptor
* ScanDesc index scan descriptor
* ----------------
*/
typedef struct BitmapIndexScanState
{
ScanState ss; /* its first field is NodeTag */
TIDBitmap *biss_result;
ScanKey biss_ScanKeys;
int biss_NumScanKeys;
IndexRuntimeKeyInfo *biss_RuntimeKeys;
int biss_NumRuntimeKeys;
IndexArrayKeyInfo *biss_ArrayKeys;
int biss_NumArrayKeys;
bool biss_RuntimeKeysReady;
ExprContext *biss_RuntimeContext;
Relation biss_RelationDesc;
IndexScanDesc biss_ScanDesc;
} BitmapIndexScanState;
/* ----------------
* SharedBitmapState information
*
* BM_INITIAL TIDBitmap creation is not yet started, so first worker
* to see this state will set the state to BM_INPROGRESS
* and that process will be responsible for creating
* TIDBitmap.
* BM_INPROGRESS TIDBitmap creation is in progress; workers need to
* sleep until it's finished.
* BM_FINISHED TIDBitmap creation is done, so now all workers can
* proceed to iterate over TIDBitmap.
* ----------------
*/
typedef enum
{
BM_INITIAL,
BM_INPROGRESS,
BM_FINISHED
} SharedBitmapState;
/* ----------------
* ParallelBitmapHeapState information
* tbmiterator iterator for scanning current pages
* prefetch_iterator iterator for prefetching ahead of current page
* mutex mutual exclusion for the prefetching variable
* and state
* prefetch_pages # pages prefetch iterator is ahead of current
* prefetch_target current target prefetch distance
* state current state of the TIDBitmap
* cv conditional wait variable
* phs_snapshot_data snapshot data shared to workers
* ----------------
*/
typedef struct ParallelBitmapHeapState
{
dsa_pointer tbmiterator;
dsa_pointer prefetch_iterator;
slock_t mutex;
int prefetch_pages;
int prefetch_target;
SharedBitmapState state;
ConditionVariable cv;
char phs_snapshot_data[FLEXIBLE_ARRAY_MEMBER];
} ParallelBitmapHeapState;
/* ----------------
* BitmapHeapScanState information
*
* bitmapqualorig execution state for bitmapqualorig expressions
* tbm bitmap obtained from child index scan(s)
* tbmiterator iterator for scanning current pages
* tbmres current-page data
* can_skip_fetch can we potentially skip tuple fetches in this scan?
* skip_fetch are we skipping tuple fetches on this page?
* vmbuffer buffer for visibility-map lookups
* pvmbuffer ditto, for prefetched pages
* exact_pages total number of exact pages retrieved
* lossy_pages total number of lossy pages retrieved
* prefetch_iterator iterator for prefetching ahead of current page
* prefetch_pages # pages prefetch iterator is ahead of current
* prefetch_target current target prefetch distance
* prefetch_maximum maximum value for prefetch_target
* pscan_len size of the shared memory for parallel bitmap
* initialized is node is ready to iterate
* shared_tbmiterator shared iterator
* shared_prefetch_iterator shared iterator for prefetching
* pstate shared state for parallel bitmap scan
* ----------------
*/
typedef struct BitmapHeapScanState
{
ScanState ss; /* its first field is NodeTag */
ExprState *bitmapqualorig;
TIDBitmap *tbm;
TBMIterator *tbmiterator;
TBMIterateResult *tbmres;
bool can_skip_fetch;
bool skip_fetch;
Buffer vmbuffer;
Buffer pvmbuffer;
long exact_pages;
long lossy_pages;
TBMIterator *prefetch_iterator;
int prefetch_pages;
int prefetch_target;
int prefetch_maximum;
Size pscan_len;
bool initialized;
TBMSharedIterator *shared_tbmiterator;
TBMSharedIterator *shared_prefetch_iterator;
ParallelBitmapHeapState *pstate;
} BitmapHeapScanState;
/* ----------------
* TidScanState information
*
* tidexprs list of TidExpr structs (see nodeTidscan.c)
* isCurrentOf scan has a CurrentOfExpr qual
* NumTids number of tids in this scan
* TidPtr index of currently fetched tid
* TidList evaluated item pointers (array of size NumTids)
* htup currently-fetched tuple, if any
* ----------------
*/
typedef struct TidScanState
{
ScanState ss; /* its first field is NodeTag */
List *tss_tidexprs;
bool tss_isCurrentOf;
int tss_NumTids;
int tss_TidPtr;
ItemPointerData *tss_TidList;
HeapTupleData tss_htup;
} TidScanState;
/* ----------------
* SubqueryScanState information
*
* SubqueryScanState is used for scanning a sub-query in the range table.
* ScanTupleSlot references the current output tuple of the sub-query.
* ----------------
*/
typedef struct SubqueryScanState
{
ScanState ss; /* its first field is NodeTag */
PlanState *subplan;
} SubqueryScanState;
/* ----------------
* FunctionScanState information
*
* Function nodes are used to scan the results of a
* function appearing in FROM (typically a function returning set).
*
* eflags node's capability flags
* ordinality is this scan WITH ORDINALITY?
* simple true if we have 1 function and no ordinality
* ordinal current ordinal column value
* nfuncs number of functions being executed
* funcstates per-function execution states (private in
* nodeFunctionscan.c)
* argcontext memory context to evaluate function arguments in
* ----------------
*/
struct FunctionScanPerFuncState;
typedef struct FunctionScanState
{
ScanState ss; /* its first field is NodeTag */
int eflags;
bool ordinality;
bool simple;
int64 ordinal;
int nfuncs;
struct FunctionScanPerFuncState *funcstates; /* array of length nfuncs */
MemoryContext argcontext;
} FunctionScanState;
/* ----------------
* ValuesScanState information
*
* ValuesScan nodes are used to scan the results of a VALUES list
*
* rowcontext per-expression-list context
* exprlists array of expression lists being evaluated
* exprstatelists array of expression state lists, for SubPlans only
* array_len size of above arrays
* curr_idx current array index (0-based)
*
* Note: ss.ps.ps_ExprContext is used to evaluate any qual or projection
* expressions attached to the node. We create a second ExprContext,
* rowcontext, in which to build the executor expression state for each
* Values sublist. Resetting this context lets us get rid of expression
* state for each row, avoiding major memory leakage over a long values list.
* However, that doesn't work for sublists containing SubPlans, because a
* SubPlan has to be connected up to the outer plan tree to work properly.
* Therefore, for only those sublists containing SubPlans, we do expression
* state construction at executor start, and store those pointers in
* exprstatelists[]. NULL entries in that array correspond to simple
* subexpressions that are handled as described above.
* ----------------
*/
typedef struct ValuesScanState
{
ScanState ss; /* its first field is NodeTag */
ExprContext *rowcontext;
List **exprlists;
int array_len;
int curr_idx;
/* in back branches, put this at the end to avoid ABI break: */
List **exprstatelists;
} ValuesScanState;
/* ----------------
* TableFuncScanState node
*
* Used in table-expression functions like XMLTABLE.
* ----------------
*/
typedef struct TableFuncScanState
{
ScanState ss; /* its first field is NodeTag */
ExprState *docexpr; /* state for document expression */
ExprState *rowexpr; /* state for row-generating expression */
List *colexprs; /* state for column-generating expression */
List *coldefexprs; /* state for column default expressions */
List *ns_names; /* same as TableFunc.ns_names */
List *ns_uris; /* list of states of namespace URI exprs */
Bitmapset *notnulls; /* nullability flag for each output column */
void *opaque; /* table builder private space */
const struct TableFuncRoutine *routine; /* table builder methods */
FmgrInfo *in_functions; /* input function for each column */
Oid *typioparams; /* typioparam for each column */
int64 ordinal; /* row number to be output next */
MemoryContext perTableCxt; /* per-table context */
Tuplestorestate *tupstore; /* output tuple store */
} TableFuncScanState;
/* ----------------
* CteScanState information
*
* CteScan nodes are used to scan a CommonTableExpr query.
*
* Multiple CteScan nodes can read out from the same CTE query. We use
* a tuplestore to hold rows that have been read from the CTE query but
* not yet consumed by all readers.
* ----------------
*/
typedef struct CteScanState
{
ScanState ss; /* its first field is NodeTag */
int eflags; /* capability flags to pass to tuplestore */
int readptr; /* index of my tuplestore read pointer */
PlanState *cteplanstate; /* PlanState for the CTE query itself */
/* Link to the "leader" CteScanState (possibly this same node) */
struct CteScanState *leader;
/* The remaining fields are only valid in the "leader" CteScanState */
Tuplestorestate *cte_table; /* rows already read from the CTE query */
bool eof_cte; /* reached end of CTE query? */
} CteScanState;
/* ----------------
* NamedTuplestoreScanState information
*
* NamedTuplestoreScan nodes are used to scan a Tuplestore created and
* named prior to execution of the query. An example is a transition
* table for an AFTER trigger.
*
* Multiple NamedTuplestoreScan nodes can read out from the same Tuplestore.
* ----------------
*/
typedef struct NamedTuplestoreScanState
{
ScanState ss; /* its first field is NodeTag */
int readptr; /* index of my tuplestore read pointer */
TupleDesc tupdesc; /* format of the tuples in the tuplestore */
Tuplestorestate *relation; /* the rows */
} NamedTuplestoreScanState;
/* ----------------
* WorkTableScanState information
*
* WorkTableScan nodes are used to scan the work table created by
* a RecursiveUnion node. We locate the RecursiveUnion node
* during executor startup.
* ----------------
*/
typedef struct WorkTableScanState
{
ScanState ss; /* its first field is NodeTag */
RecursiveUnionState *rustate;
} WorkTableScanState;
/* ----------------
* ForeignScanState information
*
* ForeignScan nodes are used to scan foreign-data tables.
* ----------------
*/
typedef struct ForeignScanState
{
ScanState ss; /* its first field is NodeTag */
ExprState *fdw_recheck_quals; /* original quals not in ss.ps.qual */
Size pscan_len; /* size of parallel coordination information */
/* use struct pointer to avoid including fdwapi.h here */
struct FdwRoutine *fdwroutine;
void *fdw_state; /* foreign-data wrapper can keep state here */
} ForeignScanState;
/* ----------------
* CustomScanState information
*
* CustomScan nodes are used to execute custom code within executor.
*
* Core code must avoid assuming that the CustomScanState is only as large as
* the structure declared here; providers are allowed to make it the first
* element in a larger structure, and typically would need to do so. The
* struct is actually allocated by the CreateCustomScanState method associated
* with the plan node. Any additional fields can be initialized there, or in
* the BeginCustomScan method.
* ----------------
*/
struct CustomExecMethods;
typedef struct CustomScanState
{
ScanState ss;
uint32 flags; /* mask of CUSTOMPATH_* flags, see
* nodes/extensible.h */
List *custom_ps; /* list of child PlanState nodes, if any */
Size pscan_len; /* size of parallel coordination information */
const struct CustomExecMethods *methods;
} CustomScanState;
/* ----------------------------------------------------------------
* Join State Information
* ----------------------------------------------------------------
*/
/* ----------------
* JoinState information
*
* Superclass for state nodes of join plans.
* ----------------
*/
typedef struct JoinState
{
PlanState ps;
JoinType jointype;
bool single_match; /* True if we should skip to next outer tuple
* after finding one inner match */
ExprState *joinqual; /* JOIN quals (in addition to ps.qual) */
} JoinState;
/* ----------------
* NestLoopState information
*
* NeedNewOuter true if need new outer tuple on next call
* MatchedOuter true if found a join match for current outer tuple
* NullInnerTupleSlot prepared null tuple for left outer joins
* ----------------
*/
typedef struct NestLoopState
{
JoinState js; /* its first field is NodeTag */
bool nl_NeedNewOuter;
bool nl_MatchedOuter;
TupleTableSlot *nl_NullInnerTupleSlot;
} NestLoopState;
/* ----------------
* MergeJoinState information
*
* NumClauses number of mergejoinable join clauses
* Clauses info for each mergejoinable clause
* JoinState current state of ExecMergeJoin state machine
* SkipMarkRestore true if we may skip Mark and Restore operations
* ExtraMarks true to issue extra Mark operations on inner scan
* ConstFalseJoin true if we have a constant-false joinqual
* FillOuter true if should emit unjoined outer tuples anyway
* FillInner true if should emit unjoined inner tuples anyway
* MatchedOuter true if found a join match for current outer tuple
* MatchedInner true if found a join match for current inner tuple
* OuterTupleSlot slot in tuple table for cur outer tuple
* InnerTupleSlot slot in tuple table for cur inner tuple
* MarkedTupleSlot slot in tuple table for marked tuple
* NullOuterTupleSlot prepared null tuple for right outer joins
* NullInnerTupleSlot prepared null tuple for left outer joins
* OuterEContext workspace for computing outer tuple's join values
* InnerEContext workspace for computing inner tuple's join values
* ----------------
*/
/* private in nodeMergejoin.c: */
typedef struct MergeJoinClauseData *MergeJoinClause;
typedef struct MergeJoinState
{
JoinState js; /* its first field is NodeTag */
int mj_NumClauses;
MergeJoinClause mj_Clauses; /* array of length mj_NumClauses */
int mj_JoinState;
bool mj_SkipMarkRestore;
bool mj_ExtraMarks;
bool mj_ConstFalseJoin;
bool mj_FillOuter;
bool mj_FillInner;
bool mj_MatchedOuter;
bool mj_MatchedInner;
TupleTableSlot *mj_OuterTupleSlot;
TupleTableSlot *mj_InnerTupleSlot;
TupleTableSlot *mj_MarkedTupleSlot;
TupleTableSlot *mj_NullOuterTupleSlot;
TupleTableSlot *mj_NullInnerTupleSlot;
ExprContext *mj_OuterEContext;
ExprContext *mj_InnerEContext;
} MergeJoinState;
/* ----------------
* HashJoinState information
*
* hashclauses original form of the hashjoin condition
* hj_OuterHashKeys the outer hash keys in the hashjoin condition
* hj_InnerHashKeys the inner hash keys in the hashjoin condition
* hj_HashOperators the join operators in the hashjoin condition
* hj_HashTable hash table for the hashjoin
* (NULL if table not built yet)
* hj_CurHashValue hash value for current outer tuple
* hj_CurBucketNo regular bucket# for current outer tuple
* hj_CurSkewBucketNo skew bucket# for current outer tuple
* hj_CurTuple last inner tuple matched to current outer
* tuple, or NULL if starting search
* (hj_CurXXX variables are undefined if
* OuterTupleSlot is empty!)
* hj_OuterTupleSlot tuple slot for outer tuples
* hj_HashTupleSlot tuple slot for inner (hashed) tuples
* hj_NullOuterTupleSlot prepared null tuple for right/full outer joins
* hj_NullInnerTupleSlot prepared null tuple for left/full outer joins
* hj_FirstOuterTupleSlot first tuple retrieved from outer plan
* hj_JoinState current state of ExecHashJoin state machine
* hj_MatchedOuter true if found a join match for current outer
* hj_OuterNotEmpty true if outer relation known not empty
* ----------------
*/
/* these structs are defined in executor/hashjoin.h: */
typedef struct HashJoinTupleData *HashJoinTuple;
typedef struct HashJoinTableData *HashJoinTable;
typedef struct HashJoinState
{
JoinState js; /* its first field is NodeTag */
ExprState *hashclauses;
List *hj_OuterHashKeys; /* list of ExprState nodes */
List *hj_InnerHashKeys; /* list of ExprState nodes */
List *hj_HashOperators; /* list of operator OIDs */
HashJoinTable hj_HashTable;
uint32 hj_CurHashValue;
int hj_CurBucketNo;
int hj_CurSkewBucketNo;
HashJoinTuple hj_CurTuple;
TupleTableSlot *hj_OuterTupleSlot;
TupleTableSlot *hj_HashTupleSlot;
TupleTableSlot *hj_NullOuterTupleSlot;
TupleTableSlot *hj_NullInnerTupleSlot;
TupleTableSlot *hj_FirstOuterTupleSlot;
int hj_JoinState;
bool hj_MatchedOuter;
bool hj_OuterNotEmpty;
} HashJoinState;
/* ----------------------------------------------------------------
* Materialization State Information
* ----------------------------------------------------------------
*/
/* ----------------
* MaterialState information
*
* materialize nodes are used to materialize the results
* of a subplan into a temporary file.
*
* ss.ss_ScanTupleSlot refers to output of underlying plan.
* ----------------
*/
typedef struct MaterialState
{
ScanState ss; /* its first field is NodeTag */
int eflags; /* capability flags to pass to tuplestore */
bool eof_underlying; /* reached end of underlying plan? */
Tuplestorestate *tuplestorestate;
} MaterialState;
/* ----------------
* Shared memory container for per-worker sort information
* ----------------
*/
typedef struct SharedSortInfo
{
int num_workers;
TuplesortInstrumentation sinstrument[FLEXIBLE_ARRAY_MEMBER];
} SharedSortInfo;
/* ----------------
* SortState information
* ----------------
*/
typedef struct SortState
{
ScanState ss; /* its first field is NodeTag */
bool randomAccess; /* need random access to sort output? */
bool bounded; /* is the result set bounded? */
int64 bound; /* if bounded, how many tuples are needed */
bool sort_Done; /* sort completed yet? */
bool bounded_Done; /* value of bounded we did the sort with */
int64 bound_Done; /* value of bound we did the sort with */
void *tuplesortstate; /* private state of tuplesort.c */
bool am_worker; /* are we a worker? */
SharedSortInfo *shared_info; /* one entry per worker */
} SortState;
/* ---------------------
* GroupState information
* ---------------------
*/
typedef struct GroupState
{
ScanState ss; /* its first field is NodeTag */
ExprState *eqfunction; /* equality function */
bool grp_done; /* indicates completion of Group scan */
} GroupState;
/* ---------------------
* AggState information
*
* ss.ss_ScanTupleSlot refers to output of underlying plan.
*
* Note: ss.ps.ps_ExprContext contains ecxt_aggvalues and
* ecxt_aggnulls arrays, which hold the computed agg values for the current
* input group during evaluation of an Agg node's output tuple(s). We
* create a second ExprContext, tmpcontext, in which to evaluate input
* expressions and run the aggregate transition functions.
* ---------------------
*/
/* these structs are private in nodeAgg.c: */
typedef struct AggStatePerAggData *AggStatePerAgg;
typedef struct AggStatePerTransData *AggStatePerTrans;
typedef struct AggStatePerGroupData *AggStatePerGroup;
typedef struct AggStatePerPhaseData *AggStatePerPhase;
typedef struct AggStatePerHashData *AggStatePerHash;
typedef struct AggState
{
ScanState ss; /* its first field is NodeTag */
List *aggs; /* all Aggref nodes in targetlist & quals */
int numaggs; /* length of list (could be zero!) */
int numtrans; /* number of pertrans items */
AggStrategy aggstrategy; /* strategy mode */
AggSplit aggsplit; /* agg-splitting mode, see nodes.h */
AggStatePerPhase phase; /* pointer to current phase data */
int numphases; /* number of phases (including phase 0) */
int current_phase; /* current phase number */
AggStatePerAgg peragg; /* per-Aggref information */
AggStatePerTrans pertrans; /* per-Trans state information */
ExprContext *hashcontext; /* econtexts for long-lived data (hashtable) */
ExprContext **aggcontexts; /* econtexts for long-lived data (per GS) */
ExprContext *tmpcontext; /* econtext for input expressions */
#define FIELDNO_AGGSTATE_CURAGGCONTEXT 14
ExprContext *curaggcontext; /* currently active aggcontext */
AggStatePerAgg curperagg; /* currently active aggregate, if any */
#define FIELDNO_AGGSTATE_CURPERTRANS 16
AggStatePerTrans curpertrans; /* currently active trans state, if any */
bool input_done; /* indicates end of input */
bool agg_done; /* indicates completion of Agg scan */
int projected_set; /* The last projected grouping set */
#define FIELDNO_AGGSTATE_CURRENT_SET 20
int current_set; /* The current grouping set being evaluated */
Bitmapset *grouped_cols; /* grouped cols in current projection */
List *all_grouped_cols; /* list of all grouped cols in DESC order */
/* These fields are for grouping set phase data */
int maxsets; /* The max number of sets in any phase */
AggStatePerPhase phases; /* array of all phases */
Tuplesortstate *sort_in; /* sorted input to phases > 1 */
Tuplesortstate *sort_out; /* input is copied here for next phase */
TupleTableSlot *sort_slot; /* slot for sort results */
/* these fields are used in AGG_PLAIN and AGG_SORTED modes: */
AggStatePerGroup *pergroups; /* grouping set indexed array of per-group
* pointers */
HeapTuple grp_firstTuple; /* copy of first tuple of current group */
/* these fields are used in AGG_HASHED and AGG_MIXED modes: */
bool table_filled; /* hash table filled yet? */
int num_hashes;
AggStatePerHash perhash; /* array of per-hashtable data */
AggStatePerGroup *hash_pergroup; /* grouping set indexed array of
* per-group pointers */
/* support for evaluation of agg input expressions: */
#define FIELDNO_AGGSTATE_ALL_PERGROUPS 34
AggStatePerGroup *all_pergroups; /* array of first ->pergroups, than
* ->hash_pergroup */
ProjectionInfo *combinedproj; /* projection machinery */
} AggState;
/* ----------------
* WindowAggState information
* ----------------
*/
/* these structs are private in nodeWindowAgg.c: */
typedef struct WindowStatePerFuncData *WindowStatePerFunc;
typedef struct WindowStatePerAggData *WindowStatePerAgg;
typedef struct WindowAggState
{
ScanState ss; /* its first field is NodeTag */
/* these fields are filled in by ExecInitExpr: */
List *funcs; /* all WindowFunc nodes in targetlist */
int numfuncs; /* total number of window functions */
int numaggs; /* number that are plain aggregates */
WindowStatePerFunc perfunc; /* per-window-function information */
WindowStatePerAgg peragg; /* per-plain-aggregate information */
ExprState *partEqfunction; /* equality funcs for partition columns */
ExprState *ordEqfunction; /* equality funcs for ordering columns */
Tuplestorestate *buffer; /* stores rows of current partition */
int current_ptr; /* read pointer # for current row */
int framehead_ptr; /* read pointer # for frame head, if used */
int frametail_ptr; /* read pointer # for frame tail, if used */
int grouptail_ptr; /* read pointer # for group tail, if used */
int64 spooled_rows; /* total # of rows in buffer */
int64 currentpos; /* position of current row in partition */
int64 frameheadpos; /* current frame head position */
int64 frametailpos; /* current frame tail position (frame end+1) */
/* use struct pointer to avoid including windowapi.h here */
struct WindowObjectData *agg_winobj; /* winobj for aggregate fetches */
int64 aggregatedbase; /* start row for current aggregates */
int64 aggregatedupto; /* rows before this one are aggregated */
int frameOptions; /* frame_clause options, see WindowDef */
ExprState *startOffset; /* expression for starting bound offset */
ExprState *endOffset; /* expression for ending bound offset */
Datum startOffsetValue; /* result of startOffset evaluation */
Datum endOffsetValue; /* result of endOffset evaluation */
/* these fields are used with RANGE offset PRECEDING/FOLLOWING: */
FmgrInfo startInRangeFunc; /* in_range function for startOffset */
FmgrInfo endInRangeFunc; /* in_range function for endOffset */
Oid inRangeColl; /* collation for in_range tests */
bool inRangeAsc; /* use ASC sort order for in_range tests? */
bool inRangeNullsFirst; /* nulls sort first for in_range tests? */
/* these fields are used in GROUPS mode: */
int64 currentgroup; /* peer group # of current row in partition */
int64 frameheadgroup; /* peer group # of frame head row */
int64 frametailgroup; /* peer group # of frame tail row */
int64 groupheadpos; /* current row's peer group head position */
int64 grouptailpos; /* " " " " tail position (group end+1) */
MemoryContext partcontext; /* context for partition-lifespan data */
MemoryContext aggcontext; /* shared context for aggregate working data */
MemoryContext curaggcontext; /* current aggregate's working data */
ExprContext *tmpcontext; /* short-term evaluation context */
bool all_first; /* true if the scan is starting */
bool all_done; /* true if the scan is finished */
bool partition_spooled; /* true if all tuples in current partition
* have been spooled into tuplestore */
bool more_partitions; /* true if there's more partitions after
* this one */
bool framehead_valid; /* true if frameheadpos is known up to
* date for current row */
bool frametail_valid; /* true if frametailpos is known up to
* date for current row */
bool grouptail_valid; /* true if grouptailpos is known up to
* date for current row */
TupleTableSlot *first_part_slot; /* first tuple of current or next
* partition */
TupleTableSlot *framehead_slot; /* first tuple of current frame */
TupleTableSlot *frametail_slot; /* first tuple after current frame */
/* temporary slots for tuples fetched back from tuplestore */
TupleTableSlot *agg_row_slot;
TupleTableSlot *temp_slot_1;
TupleTableSlot *temp_slot_2;
} WindowAggState;
/* ----------------
* UniqueState information
*
* Unique nodes are used "on top of" sort nodes to discard
* duplicate tuples returned from the sort phase. Basically
* all it does is compare the current tuple from the subplan
* with the previously fetched tuple (stored in its result slot).
* If the two are identical in all interesting fields, then
* we just fetch another tuple from the sort and try again.
* ----------------
*/
typedef struct UniqueState
{
PlanState ps; /* its first field is NodeTag */
ExprState *eqfunction; /* tuple equality qual */
} UniqueState;
/* ----------------
* GatherState information
*
* Gather nodes launch 1 or more parallel workers, run a subplan
* in those workers, and collect the results.
* ----------------
*/
typedef struct GatherState
{
PlanState ps; /* its first field is NodeTag */
bool initialized; /* workers launched? */
bool need_to_scan_locally; /* need to read from local plan? */
int64 tuples_needed; /* tuple bound, see ExecSetTupleBound */
/* these fields are set up once: */
TupleTableSlot *funnel_slot;
struct ParallelExecutorInfo *pei;
/* all remaining fields are reinitialized during a rescan: */
int nworkers_launched; /* original number of workers */
int nreaders; /* number of still-active workers */
int nextreader; /* next one to try to read from */
struct TupleQueueReader **reader; /* array with nreaders active entries */
} GatherState;
/* ----------------
* GatherMergeState information
*
* Gather merge nodes launch 1 or more parallel workers, run a
* subplan which produces sorted output in each worker, and then
* merge the results into a single sorted stream.
* ----------------
*/
struct GMReaderTupleBuffer; /* private in nodeGatherMerge.c */
typedef struct GatherMergeState
{
PlanState ps; /* its first field is NodeTag */
bool initialized; /* workers launched? */
bool gm_initialized; /* gather_merge_init() done? */
bool need_to_scan_locally; /* need to read from local plan? */
int64 tuples_needed; /* tuple bound, see ExecSetTupleBound */
/* these fields are set up once: */
TupleDesc tupDesc; /* descriptor for subplan result tuples */
int gm_nkeys; /* number of sort columns */
SortSupport gm_sortkeys; /* array of length gm_nkeys */
struct ParallelExecutorInfo *pei;
/* all remaining fields are reinitialized during a rescan */
/* (but the arrays are not reallocated, just cleared) */
int nworkers_launched; /* original number of workers */
int nreaders; /* number of active workers */
TupleTableSlot **gm_slots; /* array with nreaders+1 entries */
struct TupleQueueReader **reader; /* array with nreaders active entries */
struct GMReaderTupleBuffer *gm_tuple_buffers; /* nreaders tuple buffers */
struct binaryheap *gm_heap; /* binary heap of slot indices */
} GatherMergeState;
/* ----------------
* Values displayed by EXPLAIN ANALYZE
* ----------------
*/
typedef struct HashInstrumentation
{
int nbuckets; /* number of buckets at end of execution */
int nbuckets_original; /* planned number of buckets */
int nbatch; /* number of batches at end of execution */
int nbatch_original; /* planned number of batches */
size_t space_peak; /* speak memory usage in bytes */
} HashInstrumentation;
/* ----------------
* Shared memory container for per-worker hash information
* ----------------
*/
typedef struct SharedHashInfo
{
int num_workers;
HashInstrumentation hinstrument[FLEXIBLE_ARRAY_MEMBER];
} SharedHashInfo;
/* ----------------
* HashState information
* ----------------
*/
typedef struct HashState
{
PlanState ps; /* its first field is NodeTag */
HashJoinTable hashtable; /* hash table for the hashjoin */
List *hashkeys; /* list of ExprState nodes */
/* hashkeys is same as parent's hj_InnerHashKeys */
SharedHashInfo *shared_info; /* one entry per worker */
HashInstrumentation *hinstrument; /* this worker's entry */
/* Parallel hash state. */
struct ParallelHashJoinState *parallel_state;
} HashState;
/* ----------------
* SetOpState information
*
* Even in "sorted" mode, SetOp nodes are more complex than a simple
* Unique, since we have to count how many duplicates to return. But
* we also support hashing, so this is really more like a cut-down
* form of Agg.
* ----------------
*/
/* this struct is private in nodeSetOp.c: */
typedef struct SetOpStatePerGroupData *SetOpStatePerGroup;
typedef struct SetOpState
{
PlanState ps; /* its first field is NodeTag */
ExprState *eqfunction; /* equality comparator */
Oid *eqfuncoids; /* per-grouping-field equality fns */
FmgrInfo *hashfunctions; /* per-grouping-field hash fns */
bool setop_done; /* indicates completion of output scan */
long numOutput; /* number of dups left to output */
/* these fields are used in SETOP_SORTED mode: */
SetOpStatePerGroup pergroup; /* per-group working state */
HeapTuple grp_firstTuple; /* copy of first tuple of current group */
/* these fields are used in SETOP_HASHED mode: */
TupleHashTable hashtable; /* hash table with one entry per group */
MemoryContext tableContext; /* memory context containing hash table */
bool table_filled; /* hash table filled yet? */
TupleHashIterator hashiter; /* for iterating through hash table */
} SetOpState;
/* ----------------
* LockRowsState information
*
* LockRows nodes are used to enforce FOR [KEY] UPDATE/SHARE locking.
* ----------------
*/
typedef struct LockRowsState
{
PlanState ps; /* its first field is NodeTag */
List *lr_arowMarks; /* List of ExecAuxRowMarks */
EPQState lr_epqstate; /* for evaluating EvalPlanQual rechecks */
HeapTuple *lr_curtuples; /* locked tuples (one entry per RT entry) */
int lr_ntables; /* length of lr_curtuples[] array */
} LockRowsState;
/* ----------------
* LimitState information
*
* Limit nodes are used to enforce LIMIT/OFFSET clauses.
* They just select the desired subrange of their subplan's output.
*
* offset is the number of initial tuples to skip (0 does nothing).
* count is the number of tuples to return after skipping the offset tuples.
* If no limit count was specified, count is undefined and noCount is true.
* When lstate == LIMIT_INITIAL, offset/count/noCount haven't been set yet.
* ----------------
*/
typedef enum
{
LIMIT_INITIAL, /* initial state for LIMIT node */
LIMIT_RESCAN, /* rescan after recomputing parameters */
LIMIT_EMPTY, /* there are no returnable rows */
LIMIT_INWINDOW, /* have returned a row in the window */
LIMIT_SUBPLANEOF, /* at EOF of subplan (within window) */
LIMIT_WINDOWEND, /* stepped off end of window */
LIMIT_WINDOWSTART /* stepped off beginning of window */
} LimitStateCond;
typedef struct LimitState
{
PlanState ps; /* its first field is NodeTag */
ExprState *limitOffset; /* OFFSET parameter, or NULL if none */
ExprState *limitCount; /* COUNT parameter, or NULL if none */
int64 offset; /* current OFFSET value */
int64 count; /* current COUNT, if any */
bool noCount; /* if true, ignore count */
LimitStateCond lstate; /* state machine status, as above */
int64 position; /* 1-based index of last tuple returned */
TupleTableSlot *subSlot; /* tuple last obtained from subplan */
} LimitState;
#endif /* EXECNODES_H */
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