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/*-------------------------------------------------------------------------
*
* 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 */
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