init

db_include/partitioning/partbounds.h

@@ -0,0 +1,128 @@
+/*-------------------------------------------------------------------------
+ *
+ * partbounds.h
+ *
+ * Copyright (c) 2007-2021, PostgreSQL Global Development Group
+ *
+ * src/include/partitioning/partbounds.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PARTBOUNDS_H
+#define PARTBOUNDS_H
+
+#include "fmgr.h"
+#include "parser/parse_node.h"
+#include "partitioning/partdefs.h"
+
+struct RelOptInfo;				/* avoid including pathnodes.h here */
+
+
+/*
+ * PartitionBoundInfoData encapsulates a set of partition bounds. It is
+ * usually associated with partitioned tables as part of its partition
+ * descriptor, but may also be used to represent a virtual partitioned
+ * table such as a partitioned joinrel within the planner.
+ *
+ * A list partition datum that is known to be NULL is never put into the
+ * datums array. Instead, it is tracked using the null_index field.
+ *
+ * In the case of range partitioning, ndatums will typically be far less than
+ * 2 * nparts, because a partition's upper bound and the next partition's lower
+ * bound are the same in most common cases, and we only store one of them (the
+ * upper bound).  In case of hash partitioning, ndatums will be the same as the
+ * number of partitions.
+ *
+ * For range and list partitioned tables, datums is an array of datum-tuples
+ * with key->partnatts datums each.  For hash partitioned tables, it is an array
+ * of datum-tuples with 2 datums, modulus and remainder, corresponding to a
+ * given partition.
+ *
+ * The datums in datums array are arranged in increasing order as defined by
+ * functions qsort_partition_rbound_cmp(), qsort_partition_list_value_cmp() and
+ * qsort_partition_hbound_cmp() for range, list and hash partitioned tables
+ * respectively. For range and list partitions this simply means that the
+ * datums in the datums array are arranged in increasing order as defined by
+ * the partition key's operator classes and collations.
+ *
+ * In the case of list partitioning, the indexes array stores one entry for
+ * each datum-array entry, which is the index of the partition that accepts
+ * rows matching that datum.  So nindexes == ndatums.
+ *
+ * In the case of range partitioning, the indexes array stores one entry per
+ * distinct range datum, which is the index of the partition for which that
+ * datum is an upper bound (or -1 for a "gap" that has no partition).  It is
+ * convenient to have an extra -1 entry representing values above the last
+ * range datum, so nindexes == ndatums + 1.
+ *
+ * In the case of hash partitioning, the number of entries in the indexes
+ * array is the same as the greatest modulus amongst all partitions (which
+ * is a multiple of all partition moduli), so nindexes == greatest modulus.
+ * The indexes array is indexed according to the hash key's remainder modulo
+ * the greatest modulus, and it contains either the partition index accepting
+ * that remainder, or -1 if there is no partition for that remainder.
+ */
+typedef struct PartitionBoundInfoData
+{
+	char		strategy;		/* hash, list or range? */
+	int			ndatums;		/* Length of the datums[] array */
+	Datum	  **datums;
+	PartitionRangeDatumKind **kind; /* The kind of each range bound datum;
+									 * NULL for hash and list partitioned
+									 * tables */
+	int			nindexes;		/* Length of the indexes[] array */
+	int		   *indexes;		/* Partition indexes */
+	int			null_index;		/* Index of the null-accepting partition; -1
+								 * if there isn't one */
+	int			default_index;	/* Index of the default partition; -1 if there
+								 * isn't one */
+} PartitionBoundInfoData;
+
+#define partition_bound_accepts_nulls(bi) ((bi)->null_index != -1)
+#define partition_bound_has_default(bi) ((bi)->default_index != -1)
+
+extern int	get_hash_partition_greatest_modulus(PartitionBoundInfo b);
+extern uint64 compute_partition_hash_value(int partnatts, FmgrInfo *partsupfunc,
+										   Oid *partcollation,
+										   Datum *values, bool *isnull);
+extern List *get_qual_from_partbound(Relation rel, Relation parent,
+									 PartitionBoundSpec *spec);
+extern PartitionBoundInfo partition_bounds_create(PartitionBoundSpec **boundspecs,
+												  int nparts, PartitionKey key, int **mapping);
+extern bool partition_bounds_equal(int partnatts, int16 *parttyplen,
+								   bool *parttypbyval, PartitionBoundInfo b1,
+								   PartitionBoundInfo b2);
+extern PartitionBoundInfo partition_bounds_copy(PartitionBoundInfo src,
+												PartitionKey key);
+extern PartitionBoundInfo partition_bounds_merge(int partnatts,
+												 FmgrInfo *partsupfunc,
+												 Oid *partcollation,
+												 struct RelOptInfo *outer_rel,
+												 struct RelOptInfo *inner_rel,
+												 JoinType jointype,
+												 List **outer_parts,
+												 List **inner_parts);
+extern bool partitions_are_ordered(PartitionBoundInfo boundinfo, int nparts);
+extern void check_new_partition_bound(char *relname, Relation parent,
+									  PartitionBoundSpec *spec,
+									  ParseState *pstate);
+extern void check_default_partition_contents(Relation parent,
+											 Relation defaultRel,
+											 PartitionBoundSpec *new_spec);
+
+extern int32 partition_rbound_datum_cmp(FmgrInfo *partsupfunc,
+										Oid *partcollation,
+										Datum *rb_datums, PartitionRangeDatumKind *rb_kind,
+										Datum *tuple_datums, int n_tuple_datums);
+extern int	partition_list_bsearch(FmgrInfo *partsupfunc,
+								   Oid *partcollation,
+								   PartitionBoundInfo boundinfo,
+								   Datum value, bool *is_equal);
+extern int	partition_range_datum_bsearch(FmgrInfo *partsupfunc,
+										  Oid *partcollation,
+										  PartitionBoundInfo boundinfo,
+										  int nvalues, Datum *values, bool *is_equal);
+extern int	partition_hash_bsearch(PartitionBoundInfo boundinfo,
+								   int modulus, int remainder);
+
+#endif							/* PARTBOUNDS_H */

db_include/partitioning/partdefs.h

@@ -0,0 +1,26 @@
+/*-------------------------------------------------------------------------
+ *
+ * partdefs.h
+ *		Base definitions for partitioned table handling
+ *
+ * Copyright (c) 2007-2021, PostgreSQL Global Development Group
+ *
+ * src/include/partitioning/partdefs.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PARTDEFS_H
+#define PARTDEFS_H
+
+
+typedef struct PartitionBoundInfoData *PartitionBoundInfo;
+
+typedef struct PartitionKeyData *PartitionKey;
+
+typedef struct PartitionBoundSpec PartitionBoundSpec;
+
+typedef struct PartitionDescData *PartitionDesc;
+
+typedef struct PartitionDirectoryData *PartitionDirectory;
+
+#endif							/* PARTDEFS_H */

db_include/partitioning/partdesc.h

@@ -0,0 +1,50 @@
+/*-------------------------------------------------------------------------
+ *
+ * partdesc.h
+ *
+ * Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ *
+ * src/include/partitioning/partdesc.h
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef PARTDESC_H
+#define PARTDESC_H
+
+#include "partitioning/partdefs.h"
+#include "utils/relcache.h"
+
+/*
+ * Information about partitions of a partitioned table.
+ *
+ * For partitioned tables where detached partitions exist, we only cache
+ * descriptors that include all partitions, including detached; when we're
+ * requested a descriptor without the detached partitions, we create one
+ * afresh each time.  (The reason for this is that the set of detached
+ * partitions that are visible to each caller depends on the snapshot it has,
+ * so it's pretty much impossible to evict a descriptor from cache at the
+ * right time.)
+ */
+typedef struct PartitionDescData
+{
+	int			nparts;			/* Number of partitions */
+	bool		detached_exist; /* Are there any detached partitions? */
+	Oid		   *oids;			/* Array of 'nparts' elements containing
+								 * partition OIDs in order of the their bounds */
+	bool	   *is_leaf;		/* Array of 'nparts' elements storing whether
+								 * the corresponding 'oids' element belongs to
+								 * a leaf partition or not */
+	PartitionBoundInfo boundinfo;	/* collection of partition bounds */
+} PartitionDescData;
+
+
+extern PartitionDesc RelationGetPartitionDesc(Relation rel, bool omit_detached);
+
+extern PartitionDirectory CreatePartitionDirectory(MemoryContext mcxt, bool omit_detached);
+extern PartitionDesc PartitionDirectoryLookup(PartitionDirectory, Relation);
+extern void DestroyPartitionDirectory(PartitionDirectory pdir);
+
+extern Oid	get_default_oid_from_partdesc(PartitionDesc partdesc);
+
+#endif							/* PARTCACHE_H */

db_include/partitioning/partprune.h

@@ -0,0 +1,79 @@
+/*-------------------------------------------------------------------------
+ *
+ * partprune.h
+ *	  prototypes for partprune.c
+ *
+ *
+ * Portions Copyright (c) 1996-2021, 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 "partitioning/partdefs.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.
+ * 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;
+	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.)
+ */
+#define PruneCxtStateIdx(partnatts, step_id, keyno) \
+	((partnatts) * (step_id) + (keyno))
+
+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);
+
+#endif							/* PARTPRUNE_H */