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blue-lemon0104
130
db_include/statistics/extended_stats_internal.h
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130
db_include/statistics/extended_stats_internal.h
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/*-------------------------------------------------------------------------
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*
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* extended_stats_internal.h
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* POSTGRES extended statistics internal declarations
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*
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* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* src/include/statistics/extended_stats_internal.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef EXTENDED_STATS_INTERNAL_H
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#define EXTENDED_STATS_INTERNAL_H
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#include "statistics/statistics.h"
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#include "utils/sortsupport.h"
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typedef struct
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{
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Oid eqopr; /* '=' operator for datatype, if any */
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Oid eqfunc; /* and associated function */
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Oid ltopr; /* '<' operator for datatype, if any */
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} StdAnalyzeData;
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typedef struct
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{
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Datum value; /* a data value */
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int tupno; /* position index for tuple it came from */
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} ScalarItem;
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/* (de)serialization info */
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typedef struct DimensionInfo
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{
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int nvalues; /* number of deduplicated values */
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int nbytes; /* number of bytes (serialized) */
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int nbytes_aligned; /* size of deserialized data with alignment */
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int typlen; /* pg_type.typlen */
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bool typbyval; /* pg_type.typbyval */
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} DimensionInfo;
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/* multi-sort */
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typedef struct MultiSortSupportData
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{
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int ndims; /* number of dimensions */
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/* sort support data for each dimension: */
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SortSupportData ssup[FLEXIBLE_ARRAY_MEMBER];
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} MultiSortSupportData;
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typedef MultiSortSupportData *MultiSortSupport;
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typedef struct SortItem
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{
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Datum *values;
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bool *isnull;
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int count;
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} SortItem;
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/* a unified representation of the data the statistics is built on */
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typedef struct StatsBuildData
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{
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int numrows;
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int nattnums;
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AttrNumber *attnums;
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VacAttrStats **stats;
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Datum **values;
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bool **nulls;
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} StatsBuildData;
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extern MVNDistinct *statext_ndistinct_build(double totalrows, StatsBuildData *data);
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extern bytea *statext_ndistinct_serialize(MVNDistinct *ndistinct);
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extern MVNDistinct *statext_ndistinct_deserialize(bytea *data);
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extern MVDependencies *statext_dependencies_build(StatsBuildData *data);
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extern bytea *statext_dependencies_serialize(MVDependencies *dependencies);
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extern MVDependencies *statext_dependencies_deserialize(bytea *data);
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extern MCVList *statext_mcv_build(StatsBuildData *data,
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double totalrows, int stattarget);
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extern bytea *statext_mcv_serialize(MCVList *mcv, VacAttrStats **stats);
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extern MCVList *statext_mcv_deserialize(bytea *data);
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extern MultiSortSupport multi_sort_init(int ndims);
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extern void multi_sort_add_dimension(MultiSortSupport mss, int sortdim,
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Oid oper, Oid collation);
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extern int multi_sort_compare(const void *a, const void *b, void *arg);
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extern int multi_sort_compare_dim(int dim, const SortItem *a,
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const SortItem *b, MultiSortSupport mss);
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extern int multi_sort_compare_dims(int start, int end, const SortItem *a,
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const SortItem *b, MultiSortSupport mss);
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extern int compare_scalars_simple(const void *a, const void *b, void *arg);
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extern int compare_datums_simple(Datum a, Datum b, SortSupport ssup);
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extern AttrNumber *build_attnums_array(Bitmapset *attrs, int nexprs, int *numattrs);
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extern SortItem *build_sorted_items(StatsBuildData *data, int *nitems,
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MultiSortSupport mss,
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int numattrs, AttrNumber *attnums);
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extern bool examine_opclause_args(List *args, Node **exprp,
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Const **cstp, bool *expronleftp);
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extern Selectivity mcv_combine_selectivities(Selectivity simple_sel,
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Selectivity mcv_sel,
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Selectivity mcv_basesel,
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Selectivity mcv_totalsel);
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extern Selectivity mcv_clauselist_selectivity(PlannerInfo *root,
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StatisticExtInfo *stat,
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List *clauses,
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int varRelid,
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JoinType jointype,
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SpecialJoinInfo *sjinfo,
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RelOptInfo *rel,
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Selectivity *basesel,
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Selectivity *totalsel);
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extern Selectivity mcv_clause_selectivity_or(PlannerInfo *root,
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StatisticExtInfo *stat,
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MCVList *mcv,
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Node *clause,
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bool **or_matches,
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Selectivity *basesel,
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Selectivity *overlap_mcvsel,
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Selectivity *overlap_basesel,
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Selectivity *totalsel);
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#endif /* EXTENDED_STATS_INTERNAL_H */
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129
db_include/statistics/statistics.h
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129
db_include/statistics/statistics.h
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/*-------------------------------------------------------------------------
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*
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* statistics.h
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* Extended statistics and selectivity estimation functions.
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*
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* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/statistics/statistics.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef STATISTICS_H
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#define STATISTICS_H
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#include "commands/vacuum.h"
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#include "nodes/pathnodes.h"
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#define STATS_MAX_DIMENSIONS 8 /* max number of attributes */
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/* Multivariate distinct coefficients */
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#define STATS_NDISTINCT_MAGIC 0xA352BFA4 /* struct identifier */
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#define STATS_NDISTINCT_TYPE_BASIC 1 /* struct version */
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/* MVNDistinctItem represents a single combination of columns */
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typedef struct MVNDistinctItem
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{
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double ndistinct; /* ndistinct value for this combination */
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int nattributes; /* number of attributes */
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AttrNumber *attributes; /* attribute numbers */
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} MVNDistinctItem;
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/* A MVNDistinct object, comprising all possible combinations of columns */
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typedef struct MVNDistinct
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{
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uint32 magic; /* magic constant marker */
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uint32 type; /* type of ndistinct (BASIC) */
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uint32 nitems; /* number of items in the statistic */
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MVNDistinctItem items[FLEXIBLE_ARRAY_MEMBER];
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} MVNDistinct;
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/* Multivariate functional dependencies */
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#define STATS_DEPS_MAGIC 0xB4549A2C /* marks serialized bytea */
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#define STATS_DEPS_TYPE_BASIC 1 /* basic dependencies type */
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/*
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* Functional dependencies, tracking column-level relationships (values
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* in one column determine values in another one).
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*/
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typedef struct MVDependency
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{
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double degree; /* degree of validity (0-1) */
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AttrNumber nattributes; /* number of attributes */
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AttrNumber attributes[FLEXIBLE_ARRAY_MEMBER]; /* attribute numbers */
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} MVDependency;
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typedef struct MVDependencies
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{
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uint32 magic; /* magic constant marker */
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uint32 type; /* type of MV Dependencies (BASIC) */
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uint32 ndeps; /* number of dependencies */
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MVDependency *deps[FLEXIBLE_ARRAY_MEMBER]; /* dependencies */
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} MVDependencies;
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/* used to flag stats serialized to bytea */
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#define STATS_MCV_MAGIC 0xE1A651C2 /* marks serialized bytea */
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#define STATS_MCV_TYPE_BASIC 1 /* basic MCV list type */
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/* max items in MCV list (should be equal to max default_statistics_target) */
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#define STATS_MCVLIST_MAX_ITEMS 10000
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/*
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* Multivariate MCV (most-common value) lists
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*
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* A straightforward extension of MCV items - i.e. a list (array) of
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* combinations of attribute values, together with a frequency and null flags.
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*/
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typedef struct MCVItem
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{
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double frequency; /* frequency of this combination */
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double base_frequency; /* frequency if independent */
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bool *isnull; /* NULL flags */
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Datum *values; /* item values */
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} MCVItem;
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/* multivariate MCV list - essentially an array of MCV items */
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typedef struct MCVList
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{
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uint32 magic; /* magic constant marker */
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uint32 type; /* type of MCV list (BASIC) */
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uint32 nitems; /* number of MCV items in the array */
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AttrNumber ndimensions; /* number of dimensions */
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Oid types[STATS_MAX_DIMENSIONS]; /* OIDs of data types */
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MCVItem items[FLEXIBLE_ARRAY_MEMBER]; /* array of MCV items */
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} MCVList;
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extern MVNDistinct *statext_ndistinct_load(Oid mvoid);
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extern MVDependencies *statext_dependencies_load(Oid mvoid);
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extern MCVList *statext_mcv_load(Oid mvoid);
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extern void BuildRelationExtStatistics(Relation onerel, double totalrows,
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int numrows, HeapTuple *rows,
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int natts, VacAttrStats **vacattrstats);
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extern int ComputeExtStatisticsRows(Relation onerel,
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int natts, VacAttrStats **stats);
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extern bool statext_is_kind_built(HeapTuple htup, char kind);
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extern Selectivity dependencies_clauselist_selectivity(PlannerInfo *root,
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List *clauses,
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int varRelid,
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JoinType jointype,
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SpecialJoinInfo *sjinfo,
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RelOptInfo *rel,
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Bitmapset **estimatedclauses);
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extern Selectivity statext_clauselist_selectivity(PlannerInfo *root,
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List *clauses,
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int varRelid,
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JoinType jointype,
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SpecialJoinInfo *sjinfo,
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RelOptInfo *rel,
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Bitmapset **estimatedclauses,
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bool is_or);
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extern bool has_stats_of_kind(List *stats, char requiredkind);
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extern StatisticExtInfo *choose_best_statistics(List *stats, char requiredkind,
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Bitmapset **clause_attnums,
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List **clause_exprs,
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int nclauses);
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extern HeapTuple statext_expressions_load(Oid stxoid, int idx);
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#endif /* STATISTICS_H */
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