| /*------------------------------------------------------------------------- | |
| * | |
| * partprune.h | |
| * prototypes for partprune.c | |
| * | |
| * | |
| * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group | |
| * Portions Copyright (c) 1994, Regents of the University of California | |
| * | |
| * src/include/partitioning/partprune.h | |
| * | |
| *------------------------------------------------------------------------- | |
| */ | |
| struct PlannerInfo; /* avoid including pathnodes.h here */ | |
| struct RelOptInfo; | |
| /* | |
| * PartitionPruneContext | |
| * Stores information needed at runtime for pruning computations | |
| * related to a single partitioned table. | |
| * | |
| * 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. | |
| * exprcontext ExprContext to use when evaluating pruning expressions | |
| * exprstates Array of ExprStates, indexed as per PruneCxtStateIdx; one | |
| * for each partition key in each pruning step. Allocated if | |
| * planstate is non-NULL, otherwise NULL. | |
| */ | |
| typedef struct PartitionPruneContext | |
| { | |
| char strategy; | |
| int partnatts; | |
| int nparts; | |
| PartitionBoundInfo boundinfo; | |
| Oid *partcollation; | |
| FmgrInfo *partsupfunc; | |
| FmgrInfo *stepcmpfuncs; | |
| MemoryContext ppccontext; | |
| PlanState *planstate; | |
| ExprContext *exprcontext; | |
| ExprState **exprstates; | |
| } PartitionPruneContext; | |
| /* | |
| * PruneCxtStateIdx() computes the correct index into the stepcmpfuncs[] | |
| * and exprstates[] 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.) | |
| */ | |
| extern PartitionPruneInfo *make_partition_pruneinfo(struct PlannerInfo *root, | |
| struct RelOptInfo *parentrel, | |
| List *subpaths, | |
| List *prunequal); | |
| extern Bitmapset *prune_append_rel_partitions(struct RelOptInfo *rel); | |
| extern Bitmapset *get_matching_partitions(PartitionPruneContext *context, | |
| List *pruning_steps); | |