mirror of
https://github.com/postgres/postgres.git
synced 2026-04-13 21:17:00 -04:00
fc4faea179
The examine_opclause_expression function needs to return information on which side of the operator we found the Var, but the variable was called "isgt" which is rather misleading (it assumes the operator is either less-than or greater-than, but it may be equality or something else). Other places in the planner use a variable called "varonleft" for this purpose, so just adopt the same convention here. The code also assumed we don't care about this flag for equality, as (Var = Const) and (Const = Var) should be the same thing. But that does not work for cross-type operators, in which case we need to pass the parameters to the procedure in the right order. So just use the same code for all types of expressions. This means we don't need to care about the selectivity estimation function anymore, at least not in this code. We should only get the supported cases here (thanks to statext_is_compatible_clause). Reviewed-by: Tom Lane Discussion: https://postgr.es/m/8736jdhbhc.fsf%40ansel.ydns.eu Backpatch-to: 12
113 lines
3.9 KiB
C
113 lines
3.9 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* extended_stats_internal.h
|
|
* POSTGRES extended statistics internal declarations
|
|
*
|
|
* Portions Copyright (c) 1996-2019, 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 "utils/sortsupport.h"
|
|
#include "statistics/statistics.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;
|
|
|
|
extern MVNDistinct *statext_ndistinct_build(double totalrows,
|
|
int numrows, HeapTuple *rows,
|
|
Bitmapset *attrs, VacAttrStats **stats);
|
|
extern bytea *statext_ndistinct_serialize(MVNDistinct *ndistinct);
|
|
extern MVNDistinct *statext_ndistinct_deserialize(bytea *data);
|
|
|
|
extern MVDependencies *statext_dependencies_build(int numrows, HeapTuple *rows,
|
|
Bitmapset *attrs, VacAttrStats **stats);
|
|
extern bytea *statext_dependencies_serialize(MVDependencies *dependencies);
|
|
extern MVDependencies *statext_dependencies_deserialize(bytea *data);
|
|
|
|
extern MCVList *statext_mcv_build(int numrows, HeapTuple *rows,
|
|
Bitmapset *attrs, VacAttrStats **stats,
|
|
double totalrows);
|
|
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 void *bsearch_arg(const void *key, const void *base,
|
|
size_t nmemb, size_t size,
|
|
int (*compar) (const void *, const void *, void *),
|
|
void *arg);
|
|
|
|
extern AttrNumber *build_attnums_array(Bitmapset *attrs, int *numattrs);
|
|
|
|
extern SortItem *build_sorted_items(int numrows, int *nitems, HeapTuple *rows,
|
|
TupleDesc tdesc, MultiSortSupport mss,
|
|
int numattrs, AttrNumber *attnums);
|
|
|
|
extern bool examine_opclause_expression(OpExpr *expr, Var **varp,
|
|
Const **cstp, bool *varonleftp);
|
|
|
|
extern Selectivity mcv_clauselist_selectivity(PlannerInfo *root,
|
|
StatisticExtInfo *stat,
|
|
List *clauses,
|
|
int varRelid,
|
|
JoinType jointype,
|
|
SpecialJoinInfo *sjinfo,
|
|
RelOptInfo *rel,
|
|
Selectivity *basesel,
|
|
Selectivity *totalsel);
|
|
|
|
#endif /* EXTENDED_STATS_INTERNAL_H */
|