init

2026-04-07 13:35:22 +08:00
commit 0120fa9ce3
1530 changed files with 424864 additions and 0 deletions
--- a/db_include/statistics/extended_stats_internal.h
+++ b/db_include/statistics/extended_stats_internal.h
@@ -0,0 +1,130 @@
+/*-------------------------------------------------------------------------
+ *
+ * extended_stats_internal.h
+ *	  POSTGRES extended statistics internal declarations
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/include/statistics/extended_stats_internal.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef EXTENDED_STATS_INTERNAL_H
+#define EXTENDED_STATS_INTERNAL_H
+
+#include "statistics/statistics.h"
+#include "utils/sortsupport.h"
+
+typedef struct
+{
+	Oid			eqopr;			/* '=' operator for datatype, if any */
+	Oid			eqfunc;			/* and associated function */
+	Oid			ltopr;			/* '<' operator for datatype, if any */
+} StdAnalyzeData;
+
+typedef struct
+{
+	Datum		value;			/* a data value */
+	int			tupno;			/* position index for tuple it came from */
+} ScalarItem;
+
+/* (de)serialization info */
+typedef struct DimensionInfo
+{
+	int			nvalues;		/* number of deduplicated values */
+	int			nbytes;			/* number of bytes (serialized) */
+	int			nbytes_aligned; /* size of deserialized data with alignment */
+	int			typlen;			/* pg_type.typlen */
+	bool		typbyval;		/* pg_type.typbyval */
+} DimensionInfo;
+
+/* multi-sort */
+typedef struct MultiSortSupportData
+{
+	int			ndims;			/* number of dimensions */
+	/* sort support data for each dimension: */
+	SortSupportData ssup[FLEXIBLE_ARRAY_MEMBER];
+} MultiSortSupportData;
+
+typedef MultiSortSupportData *MultiSortSupport;
+
+typedef struct SortItem
+{
+	Datum	   *values;
+	bool	   *isnull;
+	int			count;
+} SortItem;
+
+/* a unified representation of the data the statistics is built on */
+typedef struct StatsBuildData
+{
+	int			numrows;
+	int			nattnums;
+	AttrNumber *attnums;
+	VacAttrStats **stats;
+	Datum	  **values;
+	bool	  **nulls;
+} StatsBuildData;
+
+
+extern MVNDistinct *statext_ndistinct_build(double totalrows, StatsBuildData *data);
+extern bytea *statext_ndistinct_serialize(MVNDistinct *ndistinct);
+extern MVNDistinct *statext_ndistinct_deserialize(bytea *data);
+
+extern MVDependencies *statext_dependencies_build(StatsBuildData *data);
+extern bytea *statext_dependencies_serialize(MVDependencies *dependencies);
+extern MVDependencies *statext_dependencies_deserialize(bytea *data);
+
+extern MCVList *statext_mcv_build(StatsBuildData *data,
+								  double totalrows, int stattarget);
+extern bytea *statext_mcv_serialize(MCVList *mcv, VacAttrStats **stats);
+extern MCVList *statext_mcv_deserialize(bytea *data);
+
+extern MultiSortSupport multi_sort_init(int ndims);
+extern void multi_sort_add_dimension(MultiSortSupport mss, int sortdim,
+									 Oid oper, Oid collation);
+extern int	multi_sort_compare(const void *a, const void *b, void *arg);
+extern int	multi_sort_compare_dim(int dim, const SortItem *a,
+								   const SortItem *b, MultiSortSupport mss);
+extern int	multi_sort_compare_dims(int start, int end, const SortItem *a,
+									const SortItem *b, MultiSortSupport mss);
+extern int	compare_scalars_simple(const void *a, const void *b, void *arg);
+extern int	compare_datums_simple(Datum a, Datum b, SortSupport ssup);
+
+extern AttrNumber *build_attnums_array(Bitmapset *attrs, int nexprs, int *numattrs);
+
+extern SortItem *build_sorted_items(StatsBuildData *data, int *nitems,
+									MultiSortSupport mss,
+									int numattrs, AttrNumber *attnums);
+
+extern bool examine_opclause_args(List *args, Node **exprp,
+								  Const **cstp, bool *expronleftp);
+
+extern Selectivity mcv_combine_selectivities(Selectivity simple_sel,
+											 Selectivity mcv_sel,
+											 Selectivity mcv_basesel,
+											 Selectivity mcv_totalsel);
+
+extern Selectivity mcv_clauselist_selectivity(PlannerInfo *root,
+											  StatisticExtInfo *stat,
+											  List *clauses,
+											  int varRelid,
+											  JoinType jointype,
+											  SpecialJoinInfo *sjinfo,
+											  RelOptInfo *rel,
+											  Selectivity *basesel,
+											  Selectivity *totalsel);
+
+extern Selectivity mcv_clause_selectivity_or(PlannerInfo *root,
+											 StatisticExtInfo *stat,
+											 MCVList *mcv,
+											 Node *clause,
+											 bool **or_matches,
+											 Selectivity *basesel,
+											 Selectivity *overlap_mcvsel,
+											 Selectivity *overlap_basesel,
+											 Selectivity *totalsel);
+
+#endif							/* EXTENDED_STATS_INTERNAL_H */