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/*-------------------------------------------------------------------------
*
* partprune.h
* prototypes for partprune.c
*
*
* Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/partitioning/partprune.h
*
*-------------------------------------------------------------------------
*/
#ifndef PARTPRUNE_H
#define PARTPRUNE_H
#include "nodes/execnodes.h"
#include "nodes/relation.h"
/*
* PartitionPruneContext
* Stores information needed at runtime for pruning computations
* related to a single partitioned table.
*
* partrel Relcache pointer for the partitioned table,
* if we have it open (else NULL).
* strategy Partition strategy, e.g. LIST, RANGE, HASH.
* partnatts Number of columns in the partition key.
* nparts Number of partitions in this partitioned table.
* boundinfo Partition boundary info for the partitioned table.
* partcollation Array of partnatts elements, storing the collations of the
* partition key columns.
* partsupfunc Array of FmgrInfos for the comparison or hashing functions
* associated with the partition keys (partnatts elements).
* (This points into the partrel's partition key, typically.)
* stepcmpfuncs Array of FmgrInfos for the comparison or hashing function
* for each pruning step and partition key.
* ppccontext Memory context holding this PartitionPruneContext's
* subsidiary data, such as the FmgrInfos.
* planstate Points to the parent plan node's PlanState when called
* during execution; NULL when called from the planner.
* exprstates Array of ExprStates, indexed as per PruneCtxStateIdx; one
* for each partition key in each pruning step. Allocated if
* planstate is non-NULL, otherwise NULL.
*/
typedef struct PartitionPruneContext
{
Relation partrel;
char strategy;
int partnatts;
int nparts;
PartitionBoundInfo boundinfo;
Oid *partcollation;
FmgrInfo *partsupfunc;
FmgrInfo *stepcmpfuncs;
MemoryContext ppccontext;
PlanState *planstate;
ExprState **exprstates;
} PartitionPruneContext;
/*
* PruneCxtStateIdx() computes the correct index into the stepcmpfuncs[],
* exprstates[] and exprhasexecparam[] arrays for step step_id and
* partition key column keyno. (Note: there is code that assumes the
* entries for a given step are sequential, so this is not chosen freely.)
*/
#define PruneCxtStateIdx(partnatts, step_id, keyno) \
((partnatts) * (step_id) + (keyno))
extern PartitionPruneInfo *make_partition_pruneinfo(PlannerInfo *root,
RelOptInfo *parentrel,
List *subpaths,
List *partitioned_rels,
List *prunequal);
extern Relids prune_append_rel_partitions(RelOptInfo *rel);
extern Bitmapset *get_matching_partitions(PartitionPruneContext *context,
List *pruning_steps);
#endif /* PARTPRUNE_H */
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