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plancat.h File Reference
#include "nodes/pathnodes.h"
#include "utils/relcache.h"
Include dependency graph for plancat.h:
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Typedefs

typedef void(* get_relation_info_hook_type) (PlannerInfo *root, Oid relationObjectId, bool inhparent, RelOptInfo *rel)
 

Functions

void get_relation_info (PlannerInfo *root, Oid relationObjectId, bool inhparent, RelOptInfo *rel)
 
Listinfer_arbiter_indexes (PlannerInfo *root)
 
void estimate_rel_size (Relation rel, int32 *attr_widths, BlockNumber *pages, double *tuples, double *allvisfrac)
 
int32 get_rel_data_width (Relation rel, int32 *attr_widths)
 
int32 get_relation_data_width (Oid relid, int32 *attr_widths)
 
bool relation_excluded_by_constraints (PlannerInfo *root, RelOptInfo *rel, RangeTblEntry *rte)
 
Listbuild_physical_tlist (PlannerInfo *root, RelOptInfo *rel)
 
bool has_unique_index (RelOptInfo *rel, AttrNumber attno)
 
Selectivity restriction_selectivity (PlannerInfo *root, Oid operatorid, List *args, Oid inputcollid, int varRelid)
 
Selectivity join_selectivity (PlannerInfo *root, Oid operatorid, List *args, Oid inputcollid, JoinType jointype, SpecialJoinInfo *sjinfo)
 
Selectivity function_selectivity (PlannerInfo *root, Oid funcid, List *args, Oid inputcollid, bool is_join, int varRelid, JoinType jointype, SpecialJoinInfo *sjinfo)
 
void add_function_cost (PlannerInfo *root, Oid funcid, Node *node, QualCost *cost)
 
double get_function_rows (PlannerInfo *root, Oid funcid, Node *node)
 
bool has_row_triggers (PlannerInfo *root, Index rti, CmdType event)
 
bool has_stored_generated_columns (PlannerInfo *root, Index rti)
 
Bitmapsetget_dependent_generated_columns (PlannerInfo *root, Index rti, Bitmapset *target_cols)
 

Variables

PGDLLIMPORT get_relation_info_hook_type get_relation_info_hook
 

Typedef Documentation

◆ get_relation_info_hook_type

typedef void(* get_relation_info_hook_type) (PlannerInfo *root, Oid relationObjectId, bool inhparent, RelOptInfo *rel)

Definition at line 21 of file plancat.h.

Function Documentation

◆ add_function_cost()

void add_function_cost ( PlannerInfo root,
Oid  funcid,
Node node,
QualCost cost 
)

Definition at line 2109 of file plancat.c.

2111{
2112 HeapTuple proctup;
2113 Form_pg_proc procform;
2114
2115 proctup = SearchSysCache1(PROCOID, ObjectIdGetDatum(funcid));
2116 if (!HeapTupleIsValid(proctup))
2117 elog(ERROR, "cache lookup failed for function %u", funcid);
2118 procform = (Form_pg_proc) GETSTRUCT(proctup);
2119
2120 if (OidIsValid(procform->prosupport))
2121 {
2123 SupportRequestCost *sresult;
2124
2125 req.type = T_SupportRequestCost;
2126 req.root = root;
2127 req.funcid = funcid;
2128 req.node = node;
2129
2130 /* Initialize cost fields so that support function doesn't have to */
2131 req.startup = 0;
2132 req.per_tuple = 0;
2133
2134 sresult = (SupportRequestCost *)
2135 DatumGetPointer(OidFunctionCall1(procform->prosupport,
2136 PointerGetDatum(&req)));
2137
2138 if (sresult == &req)
2139 {
2140 /* Success, so accumulate support function's estimate into *cost */
2141 cost->startup += req.startup;
2142 cost->per_tuple += req.per_tuple;
2143 ReleaseSysCache(proctup);
2144 return;
2145 }
2146 }
2147
2148 /* No support function, or it failed, so rely on procost */
2149 cost->per_tuple += procform->procost * cpu_operator_cost;
2150
2151 ReleaseSysCache(proctup);
2152}
#define OidIsValid(objectId)
Definition: c.h:732
double cpu_operator_cost
Definition: costsize.c:134
#define ERROR
Definition: elog.h:39
#define elog(elevel,...)
Definition: elog.h:225
#define OidFunctionCall1(functionId, arg1)
Definition: fmgr.h:679
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
#define GETSTRUCT(TUP)
Definition: htup_details.h:653
FormData_pg_proc * Form_pg_proc
Definition: pg_proc.h:136
static Datum PointerGetDatum(const void *X)
Definition: postgres.h:327
static Datum ObjectIdGetDatum(Oid X)
Definition: postgres.h:257
static Pointer DatumGetPointer(Datum X)
Definition: postgres.h:317
tree ctl root
Definition: radixtree.h:1857
Cost per_tuple
Definition: pathnodes.h:48
Cost startup
Definition: pathnodes.h:47
struct PlannerInfo * root
Definition: supportnodes.h:136
void ReleaseSysCache(HeapTuple tuple)
Definition: syscache.c:269
HeapTuple SearchSysCache1(int cacheId, Datum key1)
Definition: syscache.c:221

References cpu_operator_cost, DatumGetPointer(), elog, ERROR, SupportRequestCost::funcid, GETSTRUCT, HeapTupleIsValid, SupportRequestCost::node, ObjectIdGetDatum(), OidFunctionCall1, OidIsValid, QualCost::per_tuple, SupportRequestCost::per_tuple, PointerGetDatum(), ReleaseSysCache(), root, SupportRequestCost::root, SearchSysCache1(), QualCost::startup, SupportRequestCost::startup, and SupportRequestCost::type.

Referenced by cost_qual_eval_walker(), cost_windowagg(), and get_agg_clause_costs().

◆ build_physical_tlist()

List * build_physical_tlist ( PlannerInfo root,
RelOptInfo rel 
)

Definition at line 1784 of file plancat.c.

1785{
1786 List *tlist = NIL;
1787 Index varno = rel->relid;
1788 RangeTblEntry *rte = planner_rt_fetch(varno, root);
1789 Relation relation;
1790 Query *subquery;
1791 Var *var;
1792 ListCell *l;
1793 int attrno,
1794 numattrs;
1795 List *colvars;
1796
1797 switch (rte->rtekind)
1798 {
1799 case RTE_RELATION:
1800 /* Assume we already have adequate lock */
1801 relation = table_open(rte->relid, NoLock);
1802
1803 numattrs = RelationGetNumberOfAttributes(relation);
1804 for (attrno = 1; attrno <= numattrs; attrno++)
1805 {
1806 Form_pg_attribute att_tup = TupleDescAttr(relation->rd_att,
1807 attrno - 1);
1808
1809 if (att_tup->attisdropped || att_tup->atthasmissing)
1810 {
1811 /* found a dropped or missing col, so punt */
1812 tlist = NIL;
1813 break;
1814 }
1815
1816 var = makeVar(varno,
1817 attrno,
1818 att_tup->atttypid,
1819 att_tup->atttypmod,
1820 att_tup->attcollation,
1821 0);
1822
1823 tlist = lappend(tlist,
1824 makeTargetEntry((Expr *) var,
1825 attrno,
1826 NULL,
1827 false));
1828 }
1829
1830 table_close(relation, NoLock);
1831 break;
1832
1833 case RTE_SUBQUERY:
1834 subquery = rte->subquery;
1835 foreach(l, subquery->targetList)
1836 {
1837 TargetEntry *tle = (TargetEntry *) lfirst(l);
1838
1839 /*
1840 * A resjunk column of the subquery can be reflected as
1841 * resjunk in the physical tlist; we need not punt.
1842 */
1843 var = makeVarFromTargetEntry(varno, tle);
1844
1845 tlist = lappend(tlist,
1846 makeTargetEntry((Expr *) var,
1847 tle->resno,
1848 NULL,
1849 tle->resjunk));
1850 }
1851 break;
1852
1853 case RTE_FUNCTION:
1854 case RTE_TABLEFUNC:
1855 case RTE_VALUES:
1856 case RTE_CTE:
1858 case RTE_RESULT:
1859 /* Not all of these can have dropped cols, but share code anyway */
1860 expandRTE(rte, varno, 0, VAR_RETURNING_DEFAULT, -1,
1861 true /* include dropped */ , NULL, &colvars);
1862 foreach(l, colvars)
1863 {
1864 var = (Var *) lfirst(l);
1865
1866 /*
1867 * A non-Var in expandRTE's output means a dropped column;
1868 * must punt.
1869 */
1870 if (!IsA(var, Var))
1871 {
1872 tlist = NIL;
1873 break;
1874 }
1875
1876 tlist = lappend(tlist,
1877 makeTargetEntry((Expr *) var,
1878 var->varattno,
1879 NULL,
1880 false));
1881 }
1882 break;
1883
1884 default:
1885 /* caller error */
1886 elog(ERROR, "unsupported RTE kind %d in build_physical_tlist",
1887 (int) rte->rtekind);
1888 break;
1889 }
1890
1891 return tlist;
1892}
unsigned int Index
Definition: c.h:571
List * lappend(List *list, void *datum)
Definition: list.c:339
#define NoLock
Definition: lockdefs.h:34
Var * makeVarFromTargetEntry(int varno, TargetEntry *tle)
Definition: makefuncs.c:107
Var * makeVar(int varno, AttrNumber varattno, Oid vartype, int32 vartypmod, Oid varcollid, Index varlevelsup)
Definition: makefuncs.c:66
TargetEntry * makeTargetEntry(Expr *expr, AttrNumber resno, char *resname, bool resjunk)
Definition: makefuncs.c:242
#define IsA(nodeptr, _type_)
Definition: nodes.h:158
void expandRTE(RangeTblEntry *rte, int rtindex, int sublevels_up, VarReturningType returning_type, int location, bool include_dropped, List **colnames, List **colvars)
@ RTE_CTE
Definition: parsenodes.h:1032
@ RTE_NAMEDTUPLESTORE
Definition: parsenodes.h:1033
@ RTE_VALUES
Definition: parsenodes.h:1031
@ RTE_SUBQUERY
Definition: parsenodes.h:1027
@ RTE_RESULT
Definition: parsenodes.h:1034
@ RTE_FUNCTION
Definition: parsenodes.h:1029
@ RTE_TABLEFUNC
Definition: parsenodes.h:1030
@ RTE_RELATION
Definition: parsenodes.h:1026
#define planner_rt_fetch(rti, root)
Definition: pathnodes.h:570
FormData_pg_attribute * Form_pg_attribute
Definition: pg_attribute.h:200
#define lfirst(lc)
Definition: pg_list.h:172
#define NIL
Definition: pg_list.h:68
@ VAR_RETURNING_DEFAULT
Definition: primnodes.h:255
#define RelationGetNumberOfAttributes(relation)
Definition: rel.h:511
Definition: pg_list.h:54
List * targetList
Definition: parsenodes.h:193
Query * subquery
Definition: parsenodes.h:1113
RTEKind rtekind
Definition: parsenodes.h:1056
Index relid
Definition: pathnodes.h:918
TupleDesc rd_att
Definition: rel.h:112
AttrNumber resno
Definition: primnodes.h:2247
Definition: primnodes.h:261
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:126
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:40
static FormData_pg_attribute * TupleDescAttr(TupleDesc tupdesc, int i)
Definition: tupdesc.h:153

References elog, ERROR, expandRTE(), IsA, lappend(), lfirst, makeTargetEntry(), makeVar(), makeVarFromTargetEntry(), NIL, NoLock, planner_rt_fetch, RelationData::rd_att, RelationGetNumberOfAttributes, RangeTblEntry::relid, RelOptInfo::relid, TargetEntry::resno, root, RTE_CTE, RTE_FUNCTION, RTE_NAMEDTUPLESTORE, RTE_RELATION, RTE_RESULT, RTE_SUBQUERY, RTE_TABLEFUNC, RTE_VALUES, RangeTblEntry::rtekind, RangeTblEntry::subquery, table_close(), table_open(), Query::targetList, TupleDescAttr(), and VAR_RETURNING_DEFAULT.

Referenced by create_scan_plan().

◆ estimate_rel_size()

void estimate_rel_size ( Relation  rel,
int32 attr_widths,
BlockNumber pages,
double *  tuples,
double *  allvisfrac 
)

Definition at line 1067 of file plancat.c.

1069{
1070 BlockNumber curpages;
1071 BlockNumber relpages;
1072 double reltuples;
1073 BlockNumber relallvisible;
1074 double density;
1075
1076 if (RELKIND_HAS_TABLE_AM(rel->rd_rel->relkind))
1077 {
1078 table_relation_estimate_size(rel, attr_widths, pages, tuples,
1079 allvisfrac);
1080 }
1081 else if (rel->rd_rel->relkind == RELKIND_INDEX)
1082 {
1083 /*
1084 * XXX: It'd probably be good to move this into a callback, individual
1085 * index types e.g. know if they have a metapage.
1086 */
1087
1088 /* it has storage, ok to call the smgr */
1089 curpages = RelationGetNumberOfBlocks(rel);
1090
1091 /* report estimated # pages */
1092 *pages = curpages;
1093 /* quick exit if rel is clearly empty */
1094 if (curpages == 0)
1095 {
1096 *tuples = 0;
1097 *allvisfrac = 0;
1098 return;
1099 }
1100
1101 /* coerce values in pg_class to more desirable types */
1102 relpages = (BlockNumber) rel->rd_rel->relpages;
1103 reltuples = (double) rel->rd_rel->reltuples;
1104 relallvisible = (BlockNumber) rel->rd_rel->relallvisible;
1105
1106 /*
1107 * Discount the metapage while estimating the number of tuples. This
1108 * is a kluge because it assumes more than it ought to about index
1109 * structure. Currently it's OK for btree, hash, and GIN indexes but
1110 * suspect for GiST indexes.
1111 */
1112 if (relpages > 0)
1113 {
1114 curpages--;
1115 relpages--;
1116 }
1117
1118 /* estimate number of tuples from previous tuple density */
1119 if (reltuples >= 0 && relpages > 0)
1120 density = reltuples / (double) relpages;
1121 else
1122 {
1123 /*
1124 * If we have no data because the relation was never vacuumed,
1125 * estimate tuple width from attribute datatypes. We assume here
1126 * that the pages are completely full, which is OK for tables
1127 * (since they've presumably not been VACUUMed yet) but is
1128 * probably an overestimate for indexes. Fortunately
1129 * get_relation_info() can clamp the overestimate to the parent
1130 * table's size.
1131 *
1132 * Note: this code intentionally disregards alignment
1133 * considerations, because (a) that would be gilding the lily
1134 * considering how crude the estimate is, and (b) it creates
1135 * platform dependencies in the default plans which are kind of a
1136 * headache for regression testing.
1137 *
1138 * XXX: Should this logic be more index specific?
1139 */
1140 int32 tuple_width;
1141
1142 tuple_width = get_rel_data_width(rel, attr_widths);
1143 tuple_width += MAXALIGN(SizeofHeapTupleHeader);
1144 tuple_width += sizeof(ItemIdData);
1145 /* note: integer division is intentional here */
1146 density = (BLCKSZ - SizeOfPageHeaderData) / tuple_width;
1147 }
1148 *tuples = rint(density * (double) curpages);
1149
1150 /*
1151 * We use relallvisible as-is, rather than scaling it up like we do
1152 * for the pages and tuples counts, on the theory that any pages added
1153 * since the last VACUUM are most likely not marked all-visible. But
1154 * costsize.c wants it converted to a fraction.
1155 */
1156 if (relallvisible == 0 || curpages <= 0)
1157 *allvisfrac = 0;
1158 else if ((double) relallvisible >= curpages)
1159 *allvisfrac = 1;
1160 else
1161 *allvisfrac = (double) relallvisible / curpages;
1162 }
1163 else
1164 {
1165 /*
1166 * Just use whatever's in pg_class. This covers foreign tables,
1167 * sequences, and also relkinds without storage (shouldn't get here?);
1168 * see initializations in AddNewRelationTuple(). Note that FDW must
1169 * cope if reltuples is -1!
1170 */
1171 *pages = rel->rd_rel->relpages;
1172 *tuples = rel->rd_rel->reltuples;
1173 *allvisfrac = 0;
1174 }
1175}
uint32 BlockNumber
Definition: block.h:31
#define RelationGetNumberOfBlocks(reln)
Definition: bufmgr.h:273
#define SizeOfPageHeaderData
Definition: bufpage.h:216
#define MAXALIGN(LEN)
Definition: c.h:768
int32_t int32
Definition: c.h:484
#define SizeofHeapTupleHeader
Definition: htup_details.h:185
if(TABLE==NULL||TABLE_index==NULL)
Definition: isn.c:76
struct ItemIdData ItemIdData
int32 get_rel_data_width(Relation rel, int32 *attr_widths)
Definition: plancat.c:1192
Form_pg_class rd_rel
Definition: rel.h:111
static void table_relation_estimate_size(Relation rel, int32 *attr_widths, BlockNumber *pages, double *tuples, double *allvisfrac)
Definition: tableam.h:1942

References get_rel_data_width(), if(), MAXALIGN, RelationData::rd_rel, RelationGetNumberOfBlocks, SizeofHeapTupleHeader, SizeOfPageHeaderData, and table_relation_estimate_size().

Referenced by get_relation_info(), hashbuild(), and plan_create_index_workers().

◆ function_selectivity()

Selectivity function_selectivity ( PlannerInfo root,
Oid  funcid,
List args,
Oid  inputcollid,
bool  is_join,
int  varRelid,
JoinType  jointype,
SpecialJoinInfo sjinfo 
)

Definition at line 2047 of file plancat.c.

2055{
2056 RegProcedure prosupport = get_func_support(funcid);
2059
2060 /*
2061 * If no support function is provided, use our historical default
2062 * estimate, 0.3333333. This seems a pretty unprincipled choice, but
2063 * Postgres has been using that estimate for function calls since 1992.
2064 * The hoariness of this behavior suggests that we should not be in too
2065 * much hurry to use another value.
2066 */
2067 if (!prosupport)
2068 return (Selectivity) 0.3333333;
2069
2070 req.type = T_SupportRequestSelectivity;
2071 req.root = root;
2072 req.funcid = funcid;
2073 req.args = args;
2074 req.inputcollid = inputcollid;
2075 req.is_join = is_join;
2076 req.varRelid = varRelid;
2077 req.jointype = jointype;
2078 req.sjinfo = sjinfo;
2079 req.selectivity = -1; /* to catch failure to set the value */
2080
2081 sresult = (SupportRequestSelectivity *)
2083 PointerGetDatum(&req)));
2084
2085 /* If support function fails, use default */
2086 if (sresult != &req)
2087 return (Selectivity) 0.3333333;
2088
2089 if (req.selectivity < 0.0 || req.selectivity > 1.0)
2090 elog(ERROR, "invalid function selectivity: %f", req.selectivity);
2091
2092 return (Selectivity) req.selectivity;
2093}
regproc RegProcedure
Definition: c.h:607
RegProcedure get_func_support(Oid funcid)
Definition: lsyscache.c:1858
double Selectivity
Definition: nodes.h:250
struct PlannerInfo * root
Definition: supportnodes.h:96
struct SpecialJoinInfo * sjinfo
Definition: supportnodes.h:103

References generate_unaccent_rules::args, SupportRequestSelectivity::args, DatumGetPointer(), elog, ERROR, SupportRequestSelectivity::funcid, get_func_support(), SupportRequestSelectivity::inputcollid, SupportRequestSelectivity::is_join, SupportRequestSelectivity::jointype, OidFunctionCall1, PointerGetDatum(), root, SupportRequestSelectivity::root, SupportRequestSelectivity::selectivity, SupportRequestSelectivity::sjinfo, SupportRequestSelectivity::type, and SupportRequestSelectivity::varRelid.

Referenced by clause_selectivity_ext().

◆ get_dependent_generated_columns()

Bitmapset * get_dependent_generated_columns ( PlannerInfo root,
Index  rti,
Bitmapset target_cols 
)

Definition at line 2337 of file plancat.c.

2339{
2340 Bitmapset *dependentCols = NULL;
2341 RangeTblEntry *rte = planner_rt_fetch(rti, root);
2342 Relation relation;
2343 TupleDesc tupdesc;
2344 TupleConstr *constr;
2345
2346 /* Assume we already have adequate lock */
2347 relation = table_open(rte->relid, NoLock);
2348
2349 tupdesc = RelationGetDescr(relation);
2350 constr = tupdesc->constr;
2351
2352 if (constr && constr->has_generated_stored)
2353 {
2354 for (int i = 0; i < constr->num_defval; i++)
2355 {
2356 AttrDefault *defval = &constr->defval[i];
2357 Node *expr;
2358 Bitmapset *attrs_used = NULL;
2359
2360 /* skip if not generated column */
2361 if (!TupleDescAttr(tupdesc, defval->adnum - 1)->attgenerated)
2362 continue;
2363
2364 /* identify columns this generated column depends on */
2365 expr = stringToNode(defval->adbin);
2366 pull_varattnos(expr, 1, &attrs_used);
2367
2368 if (bms_overlap(target_cols, attrs_used))
2369 dependentCols = bms_add_member(dependentCols,
2371 }
2372 }
2373
2374 table_close(relation, NoLock);
2375
2376 return dependentCols;
2377}
Bitmapset * bms_add_member(Bitmapset *a, int x)
Definition: bitmapset.c:815
bool bms_overlap(const Bitmapset *a, const Bitmapset *b)
Definition: bitmapset.c:582
int i
Definition: isn.c:72
void * stringToNode(const char *str)
Definition: read.c:90
#define RelationGetDescr(relation)
Definition: rel.h:531
AttrNumber adnum
Definition: tupdesc.h:24
char * adbin
Definition: tupdesc.h:25
Definition: nodes.h:129
AttrDefault * defval
Definition: tupdesc.h:40
bool has_generated_stored
Definition: tupdesc.h:46
uint16 num_defval
Definition: tupdesc.h:43
TupleConstr * constr
Definition: tupdesc.h:134
#define FirstLowInvalidHeapAttributeNumber
Definition: sysattr.h:27
void pull_varattnos(Node *node, Index varno, Bitmapset **varattnos)
Definition: var.c:296

References AttrDefault::adbin, AttrDefault::adnum, bms_add_member(), bms_overlap(), TupleDescData::constr, TupleConstr::defval, FirstLowInvalidHeapAttributeNumber, TupleConstr::has_generated_stored, i, NoLock, TupleConstr::num_defval, planner_rt_fetch, pull_varattnos(), RelationGetDescr, RangeTblEntry::relid, root, stringToNode(), table_close(), table_open(), and TupleDescAttr().

Referenced by get_rel_all_updated_cols().

◆ get_function_rows()

double get_function_rows ( PlannerInfo root,
Oid  funcid,
Node node 
)

Definition at line 2170 of file plancat.c.

2171{
2172 HeapTuple proctup;
2173 Form_pg_proc procform;
2174 double result;
2175
2176 proctup = SearchSysCache1(PROCOID, ObjectIdGetDatum(funcid));
2177 if (!HeapTupleIsValid(proctup))
2178 elog(ERROR, "cache lookup failed for function %u", funcid);
2179 procform = (Form_pg_proc) GETSTRUCT(proctup);
2180
2181 Assert(procform->proretset); /* else caller error */
2182
2183 if (OidIsValid(procform->prosupport))
2184 {
2186 SupportRequestRows *sresult;
2187
2188 req.type = T_SupportRequestRows;
2189 req.root = root;
2190 req.funcid = funcid;
2191 req.node = node;
2192
2193 req.rows = 0; /* just for sanity */
2194
2195 sresult = (SupportRequestRows *)
2196 DatumGetPointer(OidFunctionCall1(procform->prosupport,
2197 PointerGetDatum(&req)));
2198
2199 if (sresult == &req)
2200 {
2201 /* Success */
2202 ReleaseSysCache(proctup);
2203 return req.rows;
2204 }
2205 }
2206
2207 /* No support function, or it failed, so rely on prorows */
2208 result = procform->prorows;
2209
2210 ReleaseSysCache(proctup);
2211
2212 return result;
2213}
#define Assert(condition)
Definition: c.h:815
struct PlannerInfo * root
Definition: supportnodes.h:163

References Assert, DatumGetPointer(), elog, ERROR, SupportRequestRows::funcid, GETSTRUCT, HeapTupleIsValid, SupportRequestRows::node, ObjectIdGetDatum(), OidFunctionCall1, OidIsValid, PointerGetDatum(), ReleaseSysCache(), root, SupportRequestRows::root, SupportRequestRows::rows, SearchSysCache1(), and SupportRequestRows::type.

Referenced by expression_returns_set_rows().

◆ get_rel_data_width()

int32 get_rel_data_width ( Relation  rel,
int32 attr_widths 
)

Definition at line 1192 of file plancat.c.

1193{
1194 int64 tuple_width = 0;
1195 int i;
1196
1197 for (i = 1; i <= RelationGetNumberOfAttributes(rel); i++)
1198 {
1199 Form_pg_attribute att = TupleDescAttr(rel->rd_att, i - 1);
1200 int32 item_width;
1201
1202 if (att->attisdropped)
1203 continue;
1204
1205 /* use previously cached data, if any */
1206 if (attr_widths != NULL && attr_widths[i] > 0)
1207 {
1208 tuple_width += attr_widths[i];
1209 continue;
1210 }
1211
1212 /* This should match set_rel_width() in costsize.c */
1213 item_width = get_attavgwidth(RelationGetRelid(rel), i);
1214 if (item_width <= 0)
1215 {
1216 item_width = get_typavgwidth(att->atttypid, att->atttypmod);
1217 Assert(item_width > 0);
1218 }
1219 if (attr_widths != NULL)
1220 attr_widths[i] = item_width;
1221 tuple_width += item_width;
1222 }
1223
1224 return clamp_width_est(tuple_width);
1225}
int64_t int64
Definition: c.h:485
int32 clamp_width_est(int64 tuple_width)
Definition: costsize.c:242
int32 get_attavgwidth(Oid relid, AttrNumber attnum)
Definition: lsyscache.c:3158
int32 get_typavgwidth(Oid typid, int32 typmod)
Definition: lsyscache.c:2578
#define RelationGetRelid(relation)
Definition: rel.h:505

References Assert, clamp_width_est(), get_attavgwidth(), get_typavgwidth(), i, RelationData::rd_att, RelationGetNumberOfAttributes, RelationGetRelid, and TupleDescAttr().

Referenced by estimate_rel_size(), get_relation_data_width(), and table_block_relation_estimate_size().

◆ get_relation_data_width()

int32 get_relation_data_width ( Oid  relid,
int32 attr_widths 
)

Definition at line 1234 of file plancat.c.

1235{
1236 int32 result;
1237 Relation relation;
1238
1239 /* As above, assume relation is already locked */
1240 relation = table_open(relid, NoLock);
1241
1242 result = get_rel_data_width(relation, attr_widths);
1243
1244 table_close(relation, NoLock);
1245
1246 return result;
1247}

References get_rel_data_width(), NoLock, table_close(), and table_open().

Referenced by plan_cluster_use_sort(), and set_rel_width().

◆ get_relation_info()

void get_relation_info ( PlannerInfo root,
Oid  relationObjectId,
bool  inhparent,
RelOptInfo rel 
)

Definition at line 116 of file plancat.c.

118{
119 Index varno = rel->relid;
120 Relation relation;
121 bool hasindex;
122 List *indexinfos = NIL;
123
124 /*
125 * We need not lock the relation since it was already locked, either by
126 * the rewriter or when expand_inherited_rtentry() added it to the query's
127 * rangetable.
128 */
129 relation = table_open(relationObjectId, NoLock);
130
131 /*
132 * Relations without a table AM can be used in a query only if they are of
133 * special-cased relkinds. This check prevents us from crashing later if,
134 * for example, a view's ON SELECT rule has gone missing. Note that
135 * table_open() already rejected indexes and composite types; spell the
136 * error the same way it does.
137 */
138 if (!relation->rd_tableam)
139 {
140 if (!(relation->rd_rel->relkind == RELKIND_FOREIGN_TABLE ||
141 relation->rd_rel->relkind == RELKIND_PARTITIONED_TABLE))
143 (errcode(ERRCODE_WRONG_OBJECT_TYPE),
144 errmsg("cannot open relation \"%s\"",
145 RelationGetRelationName(relation)),
146 errdetail_relkind_not_supported(relation->rd_rel->relkind)));
147 }
148
149 /* Temporary and unlogged relations are inaccessible during recovery. */
150 if (!RelationIsPermanent(relation) && RecoveryInProgress())
152 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
153 errmsg("cannot access temporary or unlogged relations during recovery")));
154
157 rel->reltablespace = RelationGetForm(relation)->reltablespace;
158
159 Assert(rel->max_attr >= rel->min_attr);
160 rel->attr_needed = (Relids *)
161 palloc0((rel->max_attr - rel->min_attr + 1) * sizeof(Relids));
162 rel->attr_widths = (int32 *)
163 palloc0((rel->max_attr - rel->min_attr + 1) * sizeof(int32));
164
165 /*
166 * Record which columns are defined as NOT NULL. We leave this
167 * unpopulated for non-partitioned inheritance parent relations as it's
168 * ambiguous as to what it means. Some child tables may have a NOT NULL
169 * constraint for a column while others may not. We could work harder and
170 * build a unioned set of all child relations notnullattnums, but there's
171 * currently no need. The RelOptInfo corresponding to the !inh
172 * RangeTblEntry does get populated.
173 */
174 if (!inhparent || relation->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
175 {
176 for (int i = 0; i < relation->rd_att->natts; i++)
177 {
178 CompactAttribute *attr = TupleDescCompactAttr(relation->rd_att, i);
179
180 if (attr->attnotnull)
181 {
183 i + 1);
184
185 /*
186 * Per RemoveAttributeById(), dropped columns will have their
187 * attnotnull unset, so we needn't check for dropped columns
188 * in the above condition.
189 */
190 Assert(!attr->attisdropped);
191 }
192 }
193 }
194
195 /*
196 * Estimate relation size --- unless it's an inheritance parent, in which
197 * case the size we want is not the rel's own size but the size of its
198 * inheritance tree. That will be computed in set_append_rel_size().
199 */
200 if (!inhparent)
201 estimate_rel_size(relation, rel->attr_widths - rel->min_attr,
202 &rel->pages, &rel->tuples, &rel->allvisfrac);
203
204 /* Retrieve the parallel_workers reloption, or -1 if not set. */
206
207 /*
208 * Make list of indexes. Ignore indexes on system catalogs if told to.
209 * Don't bother with indexes from traditional inheritance parents. For
210 * partitioned tables, we need a list of at least unique indexes as these
211 * serve as unique proofs for certain planner optimizations. However,
212 * let's not discriminate here and just record all partitioned indexes
213 * whether they're unique indexes or not.
214 */
215 if ((inhparent && relation->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
216 || (IgnoreSystemIndexes && IsSystemRelation(relation)))
217 hasindex = false;
218 else
219 hasindex = relation->rd_rel->relhasindex;
220
221 if (hasindex)
222 {
223 List *indexoidlist;
224 LOCKMODE lmode;
225 ListCell *l;
226
227 indexoidlist = RelationGetIndexList(relation);
228
229 /*
230 * For each index, we get the same type of lock that the executor will
231 * need, and do not release it. This saves a couple of trips to the
232 * shared lock manager while not creating any real loss of
233 * concurrency, because no schema changes could be happening on the
234 * index while we hold lock on the parent rel, and no lock type used
235 * for queries blocks any other kind of index operation.
236 */
237 lmode = root->simple_rte_array[varno]->rellockmode;
238
239 foreach(l, indexoidlist)
240 {
241 Oid indexoid = lfirst_oid(l);
242 Relation indexRelation;
244 IndexAmRoutine *amroutine = NULL;
245 IndexOptInfo *info;
246 int ncolumns,
247 nkeycolumns;
248 int i;
249
250 /*
251 * Extract info from the relation descriptor for the index.
252 */
253 indexRelation = index_open(indexoid, lmode);
254 index = indexRelation->rd_index;
255
256 /*
257 * Ignore invalid indexes, since they can't safely be used for
258 * queries. Note that this is OK because the data structure we
259 * are constructing is only used by the planner --- the executor
260 * still needs to insert into "invalid" indexes, if they're marked
261 * indisready.
262 */
263 if (!index->indisvalid)
264 {
265 index_close(indexRelation, NoLock);
266 continue;
267 }
268
269 /*
270 * If the index is valid, but cannot yet be used, ignore it; but
271 * mark the plan we are generating as transient. See
272 * src/backend/access/heap/README.HOT for discussion.
273 */
274 if (index->indcheckxmin &&
277 {
278 root->glob->transientPlan = true;
279 index_close(indexRelation, NoLock);
280 continue;
281 }
282
283 info = makeNode(IndexOptInfo);
284
285 info->indexoid = index->indexrelid;
286 info->reltablespace =
287 RelationGetForm(indexRelation)->reltablespace;
288 info->rel = rel;
289 info->ncolumns = ncolumns = index->indnatts;
290 info->nkeycolumns = nkeycolumns = index->indnkeyatts;
291
292 info->indexkeys = (int *) palloc(sizeof(int) * ncolumns);
293 info->indexcollations = (Oid *) palloc(sizeof(Oid) * nkeycolumns);
294 info->opfamily = (Oid *) palloc(sizeof(Oid) * nkeycolumns);
295 info->opcintype = (Oid *) palloc(sizeof(Oid) * nkeycolumns);
296 info->canreturn = (bool *) palloc(sizeof(bool) * ncolumns);
297
298 for (i = 0; i < ncolumns; i++)
299 {
300 info->indexkeys[i] = index->indkey.values[i];
301 info->canreturn[i] = index_can_return(indexRelation, i + 1);
302 }
303
304 for (i = 0; i < nkeycolumns; i++)
305 {
306 info->opfamily[i] = indexRelation->rd_opfamily[i];
307 info->opcintype[i] = indexRelation->rd_opcintype[i];
308 info->indexcollations[i] = indexRelation->rd_indcollation[i];
309 }
310
311 info->relam = indexRelation->rd_rel->relam;
312
313 /*
314 * We don't have an AM for partitioned indexes, so we'll just
315 * NULLify the AM related fields for those.
316 */
317 if (indexRelation->rd_rel->relkind != RELKIND_PARTITIONED_INDEX)
318 {
319 /* We copy just the fields we need, not all of rd_indam */
320 amroutine = indexRelation->rd_indam;
321 info->amcanorderbyop = amroutine->amcanorderbyop;
322 info->amoptionalkey = amroutine->amoptionalkey;
323 info->amsearcharray = amroutine->amsearcharray;
324 info->amsearchnulls = amroutine->amsearchnulls;
325 info->amcanparallel = amroutine->amcanparallel;
326 info->amhasgettuple = (amroutine->amgettuple != NULL);
327 info->amhasgetbitmap = amroutine->amgetbitmap != NULL &&
328 relation->rd_tableam->scan_bitmap_next_block != NULL;
329 info->amcanmarkpos = (amroutine->ammarkpos != NULL &&
330 amroutine->amrestrpos != NULL);
331 info->amcostestimate = amroutine->amcostestimate;
332 Assert(info->amcostestimate != NULL);
333
334 /* Fetch index opclass options */
335 info->opclassoptions = RelationGetIndexAttOptions(indexRelation, true);
336
337 /*
338 * Fetch the ordering information for the index, if any.
339 */
340 if (info->relam == BTREE_AM_OID)
341 {
342 /*
343 * If it's a btree index, we can use its opfamily OIDs
344 * directly as the sort ordering opfamily OIDs.
345 */
346 Assert(amroutine->amcanorder);
347
348 info->sortopfamily = info->opfamily;
349 info->reverse_sort = (bool *) palloc(sizeof(bool) * nkeycolumns);
350 info->nulls_first = (bool *) palloc(sizeof(bool) * nkeycolumns);
351
352 for (i = 0; i < nkeycolumns; i++)
353 {
354 int16 opt = indexRelation->rd_indoption[i];
355
356 info->reverse_sort[i] = (opt & INDOPTION_DESC) != 0;
357 info->nulls_first[i] = (opt & INDOPTION_NULLS_FIRST) != 0;
358 }
359 }
360 else if (amroutine->amcanorder)
361 {
362 /*
363 * Otherwise, identify the corresponding btree opfamilies
364 * by trying to map this index's "<" operators into btree.
365 * Since "<" uniquely defines the behavior of a sort
366 * order, this is a sufficient test.
367 *
368 * XXX This method is rather slow and also requires the
369 * undesirable assumption that the other index AM numbers
370 * its strategies the same as btree. It'd be better to
371 * have a way to explicitly declare the corresponding
372 * btree opfamily for each opfamily of the other index
373 * type. But given the lack of current or foreseeable
374 * amcanorder index types, it's not worth expending more
375 * effort on now.
376 */
377 info->sortopfamily = (Oid *) palloc(sizeof(Oid) * nkeycolumns);
378 info->reverse_sort = (bool *) palloc(sizeof(bool) * nkeycolumns);
379 info->nulls_first = (bool *) palloc(sizeof(bool) * nkeycolumns);
380
381 for (i = 0; i < nkeycolumns; i++)
382 {
383 int16 opt = indexRelation->rd_indoption[i];
384 Oid ltopr;
385 Oid btopfamily;
386 Oid btopcintype;
387 int16 btstrategy;
388
389 info->reverse_sort[i] = (opt & INDOPTION_DESC) != 0;
390 info->nulls_first[i] = (opt & INDOPTION_NULLS_FIRST) != 0;
391
392 ltopr = get_opfamily_member(info->opfamily[i],
393 info->opcintype[i],
394 info->opcintype[i],
396 if (OidIsValid(ltopr) &&
398 &btopfamily,
399 &btopcintype,
400 &btstrategy) &&
401 btopcintype == info->opcintype[i] &&
402 btstrategy == BTLessStrategyNumber)
403 {
404 /* Successful mapping */
405 info->sortopfamily[i] = btopfamily;
406 }
407 else
408 {
409 /* Fail ... quietly treat index as unordered */
410 info->sortopfamily = NULL;
411 info->reverse_sort = NULL;
412 info->nulls_first = NULL;
413 break;
414 }
415 }
416 }
417 else
418 {
419 info->sortopfamily = NULL;
420 info->reverse_sort = NULL;
421 info->nulls_first = NULL;
422 }
423 }
424 else
425 {
426 info->amcanorderbyop = false;
427 info->amoptionalkey = false;
428 info->amsearcharray = false;
429 info->amsearchnulls = false;
430 info->amcanparallel = false;
431 info->amhasgettuple = false;
432 info->amhasgetbitmap = false;
433 info->amcanmarkpos = false;
434 info->amcostestimate = NULL;
435
436 info->sortopfamily = NULL;
437 info->reverse_sort = NULL;
438 info->nulls_first = NULL;
439 }
440
441 /*
442 * Fetch the index expressions and predicate, if any. We must
443 * modify the copies we obtain from the relcache to have the
444 * correct varno for the parent relation, so that they match up
445 * correctly against qual clauses.
446 */
447 info->indexprs = RelationGetIndexExpressions(indexRelation);
448 info->indpred = RelationGetIndexPredicate(indexRelation);
449 if (info->indexprs && varno != 1)
450 ChangeVarNodes((Node *) info->indexprs, 1, varno, 0);
451 if (info->indpred && varno != 1)
452 ChangeVarNodes((Node *) info->indpred, 1, varno, 0);
453
454 /* Build targetlist using the completed indexprs data */
455 info->indextlist = build_index_tlist(root, info, relation);
456
457 info->indrestrictinfo = NIL; /* set later, in indxpath.c */
458 info->predOK = false; /* set later, in indxpath.c */
459 info->unique = index->indisunique;
460 info->nullsnotdistinct = index->indnullsnotdistinct;
461 info->immediate = index->indimmediate;
462 info->hypothetical = false;
463
464 /*
465 * Estimate the index size. If it's not a partial index, we lock
466 * the number-of-tuples estimate to equal the parent table; if it
467 * is partial then we have to use the same methods as we would for
468 * a table, except we can be sure that the index is not larger
469 * than the table. We must ignore partitioned indexes here as
470 * there are not physical indexes.
471 */
472 if (indexRelation->rd_rel->relkind != RELKIND_PARTITIONED_INDEX)
473 {
474 if (info->indpred == NIL)
475 {
476 info->pages = RelationGetNumberOfBlocks(indexRelation);
477 info->tuples = rel->tuples;
478 }
479 else
480 {
481 double allvisfrac; /* dummy */
482
483 estimate_rel_size(indexRelation, NULL,
484 &info->pages, &info->tuples, &allvisfrac);
485 if (info->tuples > rel->tuples)
486 info->tuples = rel->tuples;
487 }
488
489 /*
490 * Get tree height while we have the index open
491 */
492 if (amroutine->amgettreeheight)
493 {
494 info->tree_height = amroutine->amgettreeheight(indexRelation);
495 }
496 else
497 {
498 /* For other index types, just set it to "unknown" for now */
499 info->tree_height = -1;
500 }
501 }
502 else
503 {
504 /* Zero these out for partitioned indexes */
505 info->pages = 0;
506 info->tuples = 0.0;
507 info->tree_height = -1;
508 }
509
510 index_close(indexRelation, NoLock);
511
512 /*
513 * We've historically used lcons() here. It'd make more sense to
514 * use lappend(), but that causes the planner to change behavior
515 * in cases where two indexes seem equally attractive. For now,
516 * stick with lcons() --- few tables should have so many indexes
517 * that the O(N^2) behavior of lcons() is really a problem.
518 */
519 indexinfos = lcons(info, indexinfos);
520 }
521
522 list_free(indexoidlist);
523 }
524
525 rel->indexlist = indexinfos;
526
527 rel->statlist = get_relation_statistics(rel, relation);
528
529 /* Grab foreign-table info using the relcache, while we have it */
530 if (relation->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
531 {
532 /* Check if the access to foreign tables is restricted */
534 {
535 /* there must not be built-in foreign tables */
537
539 (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
540 errmsg("access to non-system foreign table is restricted")));
541 }
542
544 rel->fdwroutine = GetFdwRoutineForRelation(relation, true);
545 }
546 else
547 {
548 rel->serverid = InvalidOid;
549 rel->fdwroutine = NULL;
550 }
551
552 /* Collect info about relation's foreign keys, if relevant */
553 get_relation_foreign_keys(root, rel, relation, inhparent);
554
555 /* Collect info about functions implemented by the rel's table AM. */
556 if (relation->rd_tableam &&
557 relation->rd_tableam->scan_set_tidrange != NULL &&
558 relation->rd_tableam->scan_getnextslot_tidrange != NULL)
560
561 /*
562 * Collect info about relation's partitioning scheme, if any. Only
563 * inheritance parents may be partitioned.
564 */
565 if (inhparent && relation->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
566 set_relation_partition_info(root, rel, relation);
567
568 table_close(relation, NoLock);
569
570 /*
571 * Allow a plugin to editorialize on the info we obtained from the
572 * catalogs. Actions might include altering the assumed relation size,
573 * removing an index, or adding a hypothetical index to the indexlist.
574 */
576 (*get_relation_info_hook) (root, relationObjectId, inhparent, rel);
577}
int16_t int16
Definition: c.h:483
#define unlikely(x)
Definition: c.h:333
bool IsSystemRelation(Relation relation)
Definition: catalog.c:73
int errcode(int sqlerrcode)
Definition: elog.c:853
int errmsg(const char *fmt,...)
Definition: elog.c:1070
#define ereport(elevel,...)
Definition: elog.h:149
FdwRoutine * GetFdwRoutineForRelation(Relation relation, bool makecopy)
Definition: foreign.c:442
Oid GetForeignServerIdByRelId(Oid relid)
Definition: foreign.c:355
#define HeapTupleHeaderGetXmin(tup)
Definition: htup_details.h:309
void index_close(Relation relation, LOCKMODE lockmode)
Definition: indexam.c:177
bool index_can_return(Relation indexRelation, int attno)
Definition: indexam.c:790
Relation index_open(Oid relationId, LOCKMODE lockmode)
Definition: indexam.c:133
List * lcons(void *datum, List *list)
Definition: list.c:495
void list_free(List *list)
Definition: list.c:1546
int LOCKMODE
Definition: lockdefs.h:26
Oid get_opfamily_member(Oid opfamily, Oid lefttype, Oid righttype, int16 strategy)
Definition: lsyscache.c:166
bool get_ordering_op_properties(Oid opno, Oid *opfamily, Oid *opcintype, int16 *strategy)
Definition: lsyscache.c:207
void * palloc0(Size size)
Definition: mcxt.c:1347
void * palloc(Size size)
Definition: mcxt.c:1317
bool IgnoreSystemIndexes
Definition: miscinit.c:81
#define makeNode(_type_)
Definition: nodes.h:155
Bitmapset * Relids
Definition: pathnodes.h:30
#define AMFLAG_HAS_TID_RANGE
Definition: pathnodes.h:823
int errdetail_relkind_not_supported(char relkind)
Definition: pg_class.c:24
FormData_pg_index * Form_pg_index
Definition: pg_index.h:70
#define lfirst_oid(lc)
Definition: pg_list.h:174
void estimate_rel_size(Relation rel, int32 *attr_widths, BlockNumber *pages, double *tuples, double *allvisfrac)
Definition: plancat.c:1067
static void get_relation_foreign_keys(PlannerInfo *root, RelOptInfo *rel, Relation relation, bool inhparent)
Definition: plancat.c:590
get_relation_info_hook_type get_relation_info_hook
Definition: plancat.c:60
static List * build_index_tlist(PlannerInfo *root, IndexOptInfo *index, Relation heapRelation)
Definition: plancat.c:1905
static List * get_relation_statistics(RelOptInfo *rel, Relation relation)
Definition: plancat.c:1488
static void set_relation_partition_info(PlannerInfo *root, RelOptInfo *rel, Relation relation)
Definition: plancat.c:2385
int restrict_nonsystem_relation_kind
Definition: postgres.c:104
#define InvalidOid
Definition: postgres_ext.h:37
unsigned int Oid
Definition: postgres_ext.h:32
#define RelationGetForm(relation)
Definition: rel.h:499
#define RelationGetParallelWorkers(relation, defaultpw)
Definition: rel.h:397
#define RelationGetRelationName(relation)
Definition: rel.h:539
#define RelationIsPermanent(relation)
Definition: rel.h:617
List * RelationGetIndexList(Relation relation)
Definition: relcache.c:4756
List * RelationGetIndexPredicate(Relation relation)
Definition: relcache.c:5130
List * RelationGetIndexExpressions(Relation relation)
Definition: relcache.c:5017
bytea ** RelationGetIndexAttOptions(Relation relation, bool copy)
Definition: relcache.c:5908
void ChangeVarNodes(Node *node, int rt_index, int new_index, int sublevels_up)
Definition: rewriteManip.c:668
TransactionId TransactionXmin
Definition: snapmgr.c:99
#define BTLessStrategyNumber
Definition: stratnum.h:29
bool attisdropped
Definition: tupdesc.h:76
bool attnotnull
Definition: tupdesc.h:78
HeapTupleHeader t_data
Definition: htup.h:68
amrestrpos_function amrestrpos
Definition: amapi.h:298
amcostestimate_function amcostestimate
Definition: amapi.h:285
bool amcanorderbyop
Definition: amapi.h:237
bool amoptionalkey
Definition: amapi.h:245
amgettuple_function amgettuple
Definition: amapi.h:294
amgetbitmap_function amgetbitmap
Definition: amapi.h:295
bool amsearcharray
Definition: amapi.h:247
ammarkpos_function ammarkpos
Definition: amapi.h:297
bool amcanparallel
Definition: amapi.h:257
bool amcanorder
Definition: amapi.h:235
amgettreeheight_function amgettreeheight
Definition: amapi.h:286
bool amsearchnulls
Definition: amapi.h:249
bool amcanparallel
Definition: pathnodes.h:1209
void(* amcostestimate)(struct PlannerInfo *, struct IndexPath *, double, Cost *, Cost *, Selectivity *, double *, double *) pg_node_attr(read_write_ignore)
Definition: pathnodes.h:1214
bool amoptionalkey
Definition: pathnodes.h:1202
Oid reltablespace
Definition: pathnodes.h:1122
bool amcanmarkpos
Definition: pathnodes.h:1211
List * indrestrictinfo
Definition: pathnodes.h:1184
bool amhasgettuple
Definition: pathnodes.h:1206
bool amcanorderbyop
Definition: pathnodes.h:1201
bool hypothetical
Definition: pathnodes.h:1195
bool nullsnotdistinct
Definition: pathnodes.h:1191
List * indpred
Definition: pathnodes.h:1174
Cardinality tuples
Definition: pathnodes.h:1132
bool amsearcharray
Definition: pathnodes.h:1203
BlockNumber pages
Definition: pathnodes.h:1130
bool amsearchnulls
Definition: pathnodes.h:1204
bool amhasgetbitmap
Definition: pathnodes.h:1208
List * indextlist
Definition: pathnodes.h:1177
bool immediate
Definition: pathnodes.h:1193
uint32 amflags
Definition: pathnodes.h:958
Bitmapset * notnullattnums
Definition: pathnodes.h:936
List * statlist
Definition: pathnodes.h:946
Cardinality tuples
Definition: pathnodes.h:949
BlockNumber pages
Definition: pathnodes.h:948
List * indexlist
Definition: pathnodes.h:944
Oid reltablespace
Definition: pathnodes.h:920
Oid serverid
Definition: pathnodes.h:964
int rel_parallel_workers
Definition: pathnodes.h:956
AttrNumber max_attr
Definition: pathnodes.h:926
double allvisfrac
Definition: pathnodes.h:950
AttrNumber min_attr
Definition: pathnodes.h:924
const struct TableAmRoutine * rd_tableam
Definition: rel.h:189
struct IndexAmRoutine * rd_indam
Definition: rel.h:206
Oid * rd_opcintype
Definition: rel.h:208
struct HeapTupleData * rd_indextuple
Definition: rel.h:194
int16 * rd_indoption
Definition: rel.h:211
Form_pg_index rd_index
Definition: rel.h:192
Oid * rd_opfamily
Definition: rel.h:207
Oid * rd_indcollation
Definition: rel.h:217
bool(* scan_getnextslot_tidrange)(TableScanDesc scan, ScanDirection direction, TupleTableSlot *slot)
Definition: tableam.h:379
bool(* scan_bitmap_next_block)(TableScanDesc scan, BlockNumber *blockno, bool *recheck, uint64 *lossy_pages, uint64 *exact_pages)
Definition: tableam.h:819
void(* scan_set_tidrange)(TableScanDesc scan, ItemPointer mintid, ItemPointer maxtid)
Definition: tableam.h:371
Definition: type.h:96
#define RESTRICT_RELKIND_FOREIGN_TABLE
Definition: tcopprot.h:44
bool TransactionIdPrecedes(TransactionId id1, TransactionId id2)
Definition: transam.c:280
#define FirstNormalObjectId
Definition: transam.h:197
static CompactAttribute * TupleDescCompactAttr(TupleDesc tupdesc, int i)
Definition: tupdesc.h:168
bool RecoveryInProgress(void)
Definition: xlog.c:6334

References RelOptInfo::allvisfrac, IndexOptInfo::amcanmarkpos, IndexAmRoutine::amcanorder, IndexAmRoutine::amcanorderbyop, IndexOptInfo::amcanorderbyop, IndexAmRoutine::amcanparallel, IndexOptInfo::amcanparallel, IndexAmRoutine::amcostestimate, IndexOptInfo::amcostestimate, AMFLAG_HAS_TID_RANGE, RelOptInfo::amflags, IndexAmRoutine::amgetbitmap, IndexAmRoutine::amgettreeheight, IndexAmRoutine::amgettuple, IndexOptInfo::amhasgetbitmap, IndexOptInfo::amhasgettuple, IndexAmRoutine::ammarkpos, IndexAmRoutine::amoptionalkey, IndexOptInfo::amoptionalkey, IndexAmRoutine::amrestrpos, IndexAmRoutine::amsearcharray, IndexOptInfo::amsearcharray, IndexAmRoutine::amsearchnulls, IndexOptInfo::amsearchnulls, Assert, CompactAttribute::attisdropped, CompactAttribute::attnotnull, bms_add_member(), BTLessStrategyNumber, build_index_tlist(), ChangeVarNodes(), ereport, errcode(), errdetail_relkind_not_supported(), errmsg(), ERROR, estimate_rel_size(), FirstLowInvalidHeapAttributeNumber, FirstNormalObjectId, get_opfamily_member(), get_ordering_op_properties(), get_relation_foreign_keys(), get_relation_info_hook, get_relation_statistics(), GetFdwRoutineForRelation(), GetForeignServerIdByRelId(), HeapTupleHeaderGetXmin, IndexOptInfo::hypothetical, i, IgnoreSystemIndexes, IndexOptInfo::immediate, index_can_return(), index_close(), index_open(), RelOptInfo::indexlist, IndexOptInfo::indexoid, IndexOptInfo::indextlist, IndexOptInfo::indpred, IndexOptInfo::indrestrictinfo, InvalidOid, IsSystemRelation(), lcons(), lfirst_oid, list_free(), makeNode, RelOptInfo::max_attr, RelOptInfo::min_attr, TupleDescData::natts, IndexOptInfo::ncolumns, NIL, IndexOptInfo::nkeycolumns, NoLock, RelOptInfo::notnullattnums, IndexOptInfo::nullsnotdistinct, OidIsValid, RelOptInfo::pages, IndexOptInfo::pages, palloc(), palloc0(), IndexOptInfo::predOK, RelationData::rd_att, RelationData::rd_indam, RelationData::rd_indcollation, RelationData::rd_index, RelationData::rd_indextuple, RelationData::rd_indoption, RelationData::rd_opcintype, RelationData::rd_opfamily, RelationData::rd_rel, RelationData::rd_tableam, RecoveryInProgress(), RelOptInfo::rel_parallel_workers, IndexOptInfo::relam, RelationGetForm, RelationGetIndexAttOptions(), RelationGetIndexExpressions(), RelationGetIndexList(), RelationGetIndexPredicate(), RelationGetNumberOfAttributes, RelationGetNumberOfBlocks, RelationGetParallelWorkers, RelationGetRelationName, RelationGetRelid, RelationIsPermanent, RelOptInfo::relid, RelOptInfo::reltablespace, IndexOptInfo::reltablespace, restrict_nonsystem_relation_kind, RESTRICT_RELKIND_FOREIGN_TABLE, root, TableAmRoutine::scan_bitmap_next_block, TableAmRoutine::scan_getnextslot_tidrange, TableAmRoutine::scan_set_tidrange, RelOptInfo::serverid, set_relation_partition_info(), RelOptInfo::statlist, HeapTupleData::t_data, table_close(), table_open(), TransactionIdPrecedes(), TransactionXmin, IndexOptInfo::tree_height, TupleDescCompactAttr(), RelOptInfo::tuples, IndexOptInfo::tuples, IndexOptInfo::unique, and unlikely.

Referenced by build_simple_rel().

◆ has_row_triggers()

bool has_row_triggers ( PlannerInfo root,
Index  rti,
CmdType  event 
)

Definition at line 2260 of file plancat.c.

2261{
2262 RangeTblEntry *rte = planner_rt_fetch(rti, root);
2263 Relation relation;
2264 TriggerDesc *trigDesc;
2265 bool result = false;
2266
2267 /* Assume we already have adequate lock */
2268 relation = table_open(rte->relid, NoLock);
2269
2270 trigDesc = relation->trigdesc;
2271 switch (event)
2272 {
2273 case CMD_INSERT:
2274 if (trigDesc &&
2275 (trigDesc->trig_insert_after_row ||
2276 trigDesc->trig_insert_before_row))
2277 result = true;
2278 break;
2279 case CMD_UPDATE:
2280 if (trigDesc &&
2281 (trigDesc->trig_update_after_row ||
2282 trigDesc->trig_update_before_row))
2283 result = true;
2284 break;
2285 case CMD_DELETE:
2286 if (trigDesc &&
2287 (trigDesc->trig_delete_after_row ||
2288 trigDesc->trig_delete_before_row))
2289 result = true;
2290 break;
2291 /* There is no separate event for MERGE, only INSERT/UPDATE/DELETE */
2292 case CMD_MERGE:
2293 result = false;
2294 break;
2295 default:
2296 elog(ERROR, "unrecognized CmdType: %d", (int) event);
2297 break;
2298 }
2299
2300 table_close(relation, NoLock);
2301 return result;
2302}
@ CMD_MERGE
Definition: nodes.h:269
@ CMD_INSERT
Definition: nodes.h:267
@ CMD_DELETE
Definition: nodes.h:268
@ CMD_UPDATE
Definition: nodes.h:266
TriggerDesc * trigdesc
Definition: rel.h:117
bool trig_delete_before_row
Definition: reltrigger.h:66
bool trig_update_after_row
Definition: reltrigger.h:62
bool trig_insert_after_row
Definition: reltrigger.h:57
bool trig_update_before_row
Definition: reltrigger.h:61
bool trig_delete_after_row
Definition: reltrigger.h:67
bool trig_insert_before_row
Definition: reltrigger.h:56

References CMD_DELETE, CMD_INSERT, CMD_MERGE, CMD_UPDATE, elog, ERROR, NoLock, planner_rt_fetch, RangeTblEntry::relid, root, table_close(), table_open(), TriggerDesc::trig_delete_after_row, TriggerDesc::trig_delete_before_row, TriggerDesc::trig_insert_after_row, TriggerDesc::trig_insert_before_row, TriggerDesc::trig_update_after_row, TriggerDesc::trig_update_before_row, and RelationData::trigdesc.

Referenced by make_modifytable().

◆ has_stored_generated_columns()

bool has_stored_generated_columns ( PlannerInfo root,
Index  rti 
)

Definition at line 2310 of file plancat.c.

2311{
2312 RangeTblEntry *rte = planner_rt_fetch(rti, root);
2313 Relation relation;
2314 TupleDesc tupdesc;
2315 bool result = false;
2316
2317 /* Assume we already have adequate lock */
2318 relation = table_open(rte->relid, NoLock);
2319
2320 tupdesc = RelationGetDescr(relation);
2321 result = tupdesc->constr && tupdesc->constr->has_generated_stored;
2322
2323 table_close(relation, NoLock);
2324
2325 return result;
2326}

References TupleDescData::constr, TupleConstr::has_generated_stored, NoLock, planner_rt_fetch, RelationGetDescr, RangeTblEntry::relid, root, table_close(), and table_open().

Referenced by make_modifytable().

◆ has_unique_index()

bool has_unique_index ( RelOptInfo rel,
AttrNumber  attno 
)

Definition at line 2228 of file plancat.c.

2229{
2230 ListCell *ilist;
2231
2232 foreach(ilist, rel->indexlist)
2233 {
2234 IndexOptInfo *index = (IndexOptInfo *) lfirst(ilist);
2235
2236 /*
2237 * Note: ignore partial indexes, since they don't allow us to conclude
2238 * that all attr values are distinct, *unless* they are marked predOK
2239 * which means we know the index's predicate is satisfied by the
2240 * query. We don't take any interest in expressional indexes either.
2241 * Also, a multicolumn unique index doesn't allow us to conclude that
2242 * just the specified attr is unique.
2243 */
2244 if (index->unique &&
2245 index->nkeycolumns == 1 &&
2246 index->indexkeys[0] == attno &&
2247 (index->indpred == NIL || index->predOK))
2248 return true;
2249 }
2250 return false;
2251}

References RelOptInfo::indexlist, lfirst, and NIL.

Referenced by examine_variable().

◆ infer_arbiter_indexes()

List * infer_arbiter_indexes ( PlannerInfo root)

Definition at line 705 of file plancat.c.

706{
707 OnConflictExpr *onconflict = root->parse->onConflict;
708
709 /* Iteration state */
710 Index varno;
711 RangeTblEntry *rte;
712 Relation relation;
713 Oid indexOidFromConstraint = InvalidOid;
714 List *indexList;
715 ListCell *l;
716
717 /* Normalized inference attributes and inference expressions: */
718 Bitmapset *inferAttrs = NULL;
719 List *inferElems = NIL;
720
721 /* Results */
722 List *results = NIL;
723
724 /*
725 * Quickly return NIL for ON CONFLICT DO NOTHING without an inference
726 * specification or named constraint. ON CONFLICT DO UPDATE statements
727 * must always provide one or the other (but parser ought to have caught
728 * that already).
729 */
730 if (onconflict->arbiterElems == NIL &&
731 onconflict->constraint == InvalidOid)
732 return NIL;
733
734 /*
735 * We need not lock the relation since it was already locked, either by
736 * the rewriter or when expand_inherited_rtentry() added it to the query's
737 * rangetable.
738 */
739 varno = root->parse->resultRelation;
740 rte = rt_fetch(varno, root->parse->rtable);
741
742 relation = table_open(rte->relid, NoLock);
743
744 /*
745 * Build normalized/BMS representation of plain indexed attributes, as
746 * well as a separate list of expression items. This simplifies matching
747 * the cataloged definition of indexes.
748 */
749 foreach(l, onconflict->arbiterElems)
750 {
751 InferenceElem *elem = (InferenceElem *) lfirst(l);
752 Var *var;
753 int attno;
754
755 if (!IsA(elem->expr, Var))
756 {
757 /* If not a plain Var, just shove it in inferElems for now */
758 inferElems = lappend(inferElems, elem->expr);
759 continue;
760 }
761
762 var = (Var *) elem->expr;
763 attno = var->varattno;
764
765 if (attno == 0)
767 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
768 errmsg("whole row unique index inference specifications are not supported")));
769
770 inferAttrs = bms_add_member(inferAttrs,
772 }
773
774 /*
775 * Lookup named constraint's index. This is not immediately returned
776 * because some additional sanity checks are required.
777 */
778 if (onconflict->constraint != InvalidOid)
779 {
780 indexOidFromConstraint = get_constraint_index(onconflict->constraint);
781
782 if (indexOidFromConstraint == InvalidOid)
784 (errcode(ERRCODE_WRONG_OBJECT_TYPE),
785 errmsg("constraint in ON CONFLICT clause has no associated index")));
786 }
787
788 /*
789 * Using that representation, iterate through the list of indexes on the
790 * target relation to try and find a match
791 */
792 indexList = RelationGetIndexList(relation);
793
794 foreach(l, indexList)
795 {
796 Oid indexoid = lfirst_oid(l);
797 Relation idxRel;
798 Form_pg_index idxForm;
799 Bitmapset *indexedAttrs;
800 List *idxExprs;
801 List *predExprs;
802 AttrNumber natt;
803 ListCell *el;
804
805 /*
806 * Extract info from the relation descriptor for the index. Obtain
807 * the same lock type that the executor will ultimately use.
808 *
809 * Let executor complain about !indimmediate case directly, because
810 * enforcement needs to occur there anyway when an inference clause is
811 * omitted.
812 */
813 idxRel = index_open(indexoid, rte->rellockmode);
814 idxForm = idxRel->rd_index;
815
816 if (!idxForm->indisvalid)
817 goto next;
818
819 /*
820 * Note that we do not perform a check against indcheckxmin (like e.g.
821 * get_relation_info()) here to eliminate candidates, because
822 * uniqueness checking only cares about the most recently committed
823 * tuple versions.
824 */
825
826 /*
827 * Look for match on "ON constraint_name" variant, which may not be
828 * unique constraint. This can only be a constraint name.
829 */
830 if (indexOidFromConstraint == idxForm->indexrelid)
831 {
832 if (idxForm->indisexclusion && onconflict->action == ONCONFLICT_UPDATE)
834 (errcode(ERRCODE_WRONG_OBJECT_TYPE),
835 errmsg("ON CONFLICT DO UPDATE not supported with exclusion constraints")));
836
837 results = lappend_oid(results, idxForm->indexrelid);
838 list_free(indexList);
839 index_close(idxRel, NoLock);
840 table_close(relation, NoLock);
841 return results;
842 }
843 else if (indexOidFromConstraint != InvalidOid)
844 {
845 /* No point in further work for index in named constraint case */
846 goto next;
847 }
848
849 /*
850 * Only considering conventional inference at this point (not named
851 * constraints), so index under consideration can be immediately
852 * skipped if it's not unique
853 */
854 if (!idxForm->indisunique)
855 goto next;
856
857 /*
858 * So-called unique constraints with WITHOUT OVERLAPS are really
859 * exclusion constraints, so skip those too.
860 */
861 if (idxForm->indisexclusion)
862 goto next;
863
864 /* Build BMS representation of plain (non expression) index attrs */
865 indexedAttrs = NULL;
866 for (natt = 0; natt < idxForm->indnkeyatts; natt++)
867 {
868 int attno = idxRel->rd_index->indkey.values[natt];
869
870 if (attno != 0)
871 indexedAttrs = bms_add_member(indexedAttrs,
873 }
874
875 /* Non-expression attributes (if any) must match */
876 if (!bms_equal(indexedAttrs, inferAttrs))
877 goto next;
878
879 /* Expression attributes (if any) must match */
880 idxExprs = RelationGetIndexExpressions(idxRel);
881 if (idxExprs && varno != 1)
882 ChangeVarNodes((Node *) idxExprs, 1, varno, 0);
883
884 foreach(el, onconflict->arbiterElems)
885 {
886 InferenceElem *elem = (InferenceElem *) lfirst(el);
887
888 /*
889 * Ensure that collation/opclass aspects of inference expression
890 * element match. Even though this loop is primarily concerned
891 * with matching expressions, it is a convenient point to check
892 * this for both expressions and ordinary (non-expression)
893 * attributes appearing as inference elements.
894 */
895 if (!infer_collation_opclass_match(elem, idxRel, idxExprs))
896 goto next;
897
898 /*
899 * Plain Vars don't factor into count of expression elements, and
900 * the question of whether or not they satisfy the index
901 * definition has already been considered (they must).
902 */
903 if (IsA(elem->expr, Var))
904 continue;
905
906 /*
907 * Might as well avoid redundant check in the rare cases where
908 * infer_collation_opclass_match() is required to do real work.
909 * Otherwise, check that element expression appears in cataloged
910 * index definition.
911 */
912 if (elem->infercollid != InvalidOid ||
913 elem->inferopclass != InvalidOid ||
914 list_member(idxExprs, elem->expr))
915 continue;
916
917 goto next;
918 }
919
920 /*
921 * Now that all inference elements were matched, ensure that the
922 * expression elements from inference clause are not missing any
923 * cataloged expressions. This does the right thing when unique
924 * indexes redundantly repeat the same attribute, or if attributes
925 * redundantly appear multiple times within an inference clause.
926 */
927 if (list_difference(idxExprs, inferElems) != NIL)
928 goto next;
929
930 /*
931 * If it's a partial index, its predicate must be implied by the ON
932 * CONFLICT's WHERE clause.
933 */
934 predExprs = RelationGetIndexPredicate(idxRel);
935 if (predExprs && varno != 1)
936 ChangeVarNodes((Node *) predExprs, 1, varno, 0);
937
938 if (!predicate_implied_by(predExprs, (List *) onconflict->arbiterWhere, false))
939 goto next;
940
941 results = lappend_oid(results, idxForm->indexrelid);
942next:
943 index_close(idxRel, NoLock);
944 }
945
946 list_free(indexList);
947 table_close(relation, NoLock);
948
949 if (results == NIL)
951 (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
952 errmsg("there is no unique or exclusion constraint matching the ON CONFLICT specification")));
953
954 return results;
955}
int16 AttrNumber
Definition: attnum.h:21
bool bms_equal(const Bitmapset *a, const Bitmapset *b)
Definition: bitmapset.c:142
static int32 next
Definition: blutils.c:219
List * list_difference(const List *list1, const List *list2)
Definition: list.c:1237
List * lappend_oid(List *list, Oid datum)
Definition: list.c:375
bool list_member(const List *list, const void *datum)
Definition: list.c:661
Oid get_constraint_index(Oid conoid)
Definition: lsyscache.c:1113
@ ONCONFLICT_UPDATE
Definition: nodes.h:420
#define rt_fetch(rangetable_index, rangetable)
Definition: parsetree.h:31
static bool infer_collation_opclass_match(InferenceElem *elem, Relation idxRel, List *idxExprs)
Definition: plancat.c:985
bool predicate_implied_by(List *predicate_list, List *clause_list, bool weak)
Definition: predtest.c:152
List * arbiterElems
Definition: primnodes.h:2382
OnConflictAction action
Definition: primnodes.h:2379
Node * arbiterWhere
Definition: primnodes.h:2384
AttrNumber varattno
Definition: primnodes.h:273

References OnConflictExpr::action, OnConflictExpr::arbiterElems, OnConflictExpr::arbiterWhere, bms_add_member(), bms_equal(), ChangeVarNodes(), OnConflictExpr::constraint, ereport, errcode(), errmsg(), ERROR, InferenceElem::expr, FirstLowInvalidHeapAttributeNumber, get_constraint_index(), if(), index_close(), index_open(), infer_collation_opclass_match(), InferenceElem::infercollid, InferenceElem::inferopclass, InvalidOid, IsA, lappend(), lappend_oid(), lfirst, lfirst_oid, list_difference(), list_free(), list_member(), next, NIL, NoLock, ONCONFLICT_UPDATE, predicate_implied_by(), RelationData::rd_index, RelationGetIndexExpressions(), RelationGetIndexList(), RelationGetIndexPredicate(), RangeTblEntry::relid, root, rt_fetch, table_close(), table_open(), and Var::varattno.

Referenced by make_modifytable().

◆ join_selectivity()

Selectivity join_selectivity ( PlannerInfo root,
Oid  operatorid,
List args,
Oid  inputcollid,
JoinType  jointype,
SpecialJoinInfo sjinfo 
)

Definition at line 2006 of file plancat.c.

2012{
2013 RegProcedure oprjoin = get_oprjoin(operatorid);
2014 float8 result;
2015
2016 /*
2017 * if the oprjoin procedure is missing for whatever reason, use a
2018 * selectivity of 0.5
2019 */
2020 if (!oprjoin)
2021 return (Selectivity) 0.5;
2022
2023 result = DatumGetFloat8(OidFunctionCall5Coll(oprjoin,
2024 inputcollid,
2026 ObjectIdGetDatum(operatorid),
2028 Int16GetDatum(jointype),
2029 PointerGetDatum(sjinfo)));
2030
2031 if (result < 0.0 || result > 1.0)
2032 elog(ERROR, "invalid join selectivity: %f", result);
2033
2034 return (Selectivity) result;
2035}
double float8
Definition: c.h:587
Datum OidFunctionCall5Coll(Oid functionId, Oid collation, Datum arg1, Datum arg2, Datum arg3, Datum arg4, Datum arg5)
Definition: fmgr.c:1453
RegProcedure get_oprjoin(Oid opno)
Definition: lsyscache.c:1581
static Datum Int16GetDatum(int16 X)
Definition: postgres.h:177
static float8 DatumGetFloat8(Datum X)
Definition: postgres.h:499

References generate_unaccent_rules::args, DatumGetFloat8(), elog, ERROR, get_oprjoin(), Int16GetDatum(), ObjectIdGetDatum(), OidFunctionCall5Coll(), PointerGetDatum(), and root.

Referenced by clause_selectivity_ext(), rowcomparesel(), and test_support_func().

◆ relation_excluded_by_constraints()

bool relation_excluded_by_constraints ( PlannerInfo root,
RelOptInfo rel,
RangeTblEntry rte 
)

Definition at line 1594 of file plancat.c.

1596{
1597 bool include_noinherit;
1598 bool include_notnull;
1599 bool include_partition = false;
1600 List *safe_restrictions;
1601 List *constraint_pred;
1602 List *safe_constraints;
1603 ListCell *lc;
1604
1605 /* As of now, constraint exclusion works only with simple relations. */
1606 Assert(IS_SIMPLE_REL(rel));
1607
1608 /*
1609 * If there are no base restriction clauses, we have no hope of proving
1610 * anything below, so fall out quickly.
1611 */
1612 if (rel->baserestrictinfo == NIL)
1613 return false;
1614
1615 /*
1616 * Regardless of the setting of constraint_exclusion, detect
1617 * constant-FALSE-or-NULL restriction clauses. Although const-folding
1618 * will reduce "anything AND FALSE" to just "FALSE", the baserestrictinfo
1619 * list can still have other members besides the FALSE constant, due to
1620 * qual pushdown and other mechanisms; so check them all. This doesn't
1621 * fire very often, but it seems cheap enough to be worth doing anyway.
1622 * (Without this, we'd miss some optimizations that 9.5 and earlier found
1623 * via much more roundabout methods.)
1624 */
1625 foreach(lc, rel->baserestrictinfo)
1626 {
1627 RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
1628 Expr *clause = rinfo->clause;
1629
1630 if (clause && IsA(clause, Const) &&
1631 (((Const *) clause)->constisnull ||
1632 !DatumGetBool(((Const *) clause)->constvalue)))
1633 return true;
1634 }
1635
1636 /*
1637 * Skip further tests, depending on constraint_exclusion.
1638 */
1639 switch (constraint_exclusion)
1640 {
1642 /* In 'off' mode, never make any further tests */
1643 return false;
1644
1646
1647 /*
1648 * When constraint_exclusion is set to 'partition' we only handle
1649 * appendrel members. Partition pruning has already been applied,
1650 * so there is no need to consider the rel's partition constraints
1651 * here.
1652 */
1654 break; /* appendrel member, so process it */
1655 return false;
1656
1658
1659 /*
1660 * In 'on' mode, always apply constraint exclusion. If we are
1661 * considering a baserel that is a partition (i.e., it was
1662 * directly named rather than expanded from a parent table), then
1663 * its partition constraints haven't been considered yet, so
1664 * include them in the processing here.
1665 */
1666 if (rel->reloptkind == RELOPT_BASEREL)
1667 include_partition = true;
1668 break; /* always try to exclude */
1669 }
1670
1671 /*
1672 * Check for self-contradictory restriction clauses. We dare not make
1673 * deductions with non-immutable functions, but any immutable clauses that
1674 * are self-contradictory allow us to conclude the scan is unnecessary.
1675 *
1676 * Note: strip off RestrictInfo because predicate_refuted_by() isn't
1677 * expecting to see any in its predicate argument.
1678 */
1679 safe_restrictions = NIL;
1680 foreach(lc, rel->baserestrictinfo)
1681 {
1682 RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
1683
1684 if (!contain_mutable_functions((Node *) rinfo->clause))
1685 safe_restrictions = lappend(safe_restrictions, rinfo->clause);
1686 }
1687
1688 /*
1689 * We can use weak refutation here, since we're comparing restriction
1690 * clauses with restriction clauses.
1691 */
1692 if (predicate_refuted_by(safe_restrictions, safe_restrictions, true))
1693 return true;
1694
1695 /*
1696 * Only plain relations have constraints, so stop here for other rtekinds.
1697 */
1698 if (rte->rtekind != RTE_RELATION)
1699 return false;
1700
1701 /*
1702 * If we are scanning just this table, we can use NO INHERIT constraints,
1703 * but not if we're scanning its children too. (Note that partitioned
1704 * tables should never have NO INHERIT constraints; but it's not necessary
1705 * for us to assume that here.)
1706 */
1707 include_noinherit = !rte->inh;
1708
1709 /*
1710 * Currently, attnotnull constraints must be treated as NO INHERIT unless
1711 * this is a partitioned table. In future we might track their
1712 * inheritance status more accurately, allowing this to be refined.
1713 *
1714 * XXX do we need/want to change this?
1715 */
1716 include_notnull = (!rte->inh || rte->relkind == RELKIND_PARTITIONED_TABLE);
1717
1718 /*
1719 * Fetch the appropriate set of constraint expressions.
1720 */
1721 constraint_pred = get_relation_constraints(root, rte->relid, rel,
1722 include_noinherit,
1723 include_notnull,
1724 include_partition);
1725
1726 /*
1727 * We do not currently enforce that CHECK constraints contain only
1728 * immutable functions, so it's necessary to check here. We daren't draw
1729 * conclusions from plan-time evaluation of non-immutable functions. Since
1730 * they're ANDed, we can just ignore any mutable constraints in the list,
1731 * and reason about the rest.
1732 */
1733 safe_constraints = NIL;
1734 foreach(lc, constraint_pred)
1735 {
1736 Node *pred = (Node *) lfirst(lc);
1737
1738 if (!contain_mutable_functions(pred))
1739 safe_constraints = lappend(safe_constraints, pred);
1740 }
1741
1742 /*
1743 * The constraints are effectively ANDed together, so we can just try to
1744 * refute the entire collection at once. This may allow us to make proofs
1745 * that would fail if we took them individually.
1746 *
1747 * Note: we use rel->baserestrictinfo, not safe_restrictions as might seem
1748 * an obvious optimization. Some of the clauses might be OR clauses that
1749 * have volatile and nonvolatile subclauses, and it's OK to make
1750 * deductions with the nonvolatile parts.
1751 *
1752 * We need strong refutation because we have to prove that the constraints
1753 * would yield false, not just NULL.
1754 */
1755 if (predicate_refuted_by(safe_constraints, rel->baserestrictinfo, false))
1756 return true;
1757
1758 return false;
1759}
bool contain_mutable_functions(Node *clause)
Definition: clauses.c:369
@ CONSTRAINT_EXCLUSION_OFF
Definition: cost.h:38
@ CONSTRAINT_EXCLUSION_PARTITION
Definition: cost.h:40
@ CONSTRAINT_EXCLUSION_ON
Definition: cost.h:39
#define IS_SIMPLE_REL(rel)
Definition: pathnodes.h:839
@ RELOPT_BASEREL
Definition: pathnodes.h:827
@ RELOPT_OTHER_MEMBER_REL
Definition: pathnodes.h:829
int constraint_exclusion
Definition: plancat.c:57
static List * get_relation_constraints(PlannerInfo *root, Oid relationObjectId, RelOptInfo *rel, bool include_noinherit, bool include_notnull, bool include_partition)
Definition: plancat.c:1274
static bool DatumGetBool(Datum X)
Definition: postgres.h:95
bool predicate_refuted_by(List *predicate_list, List *clause_list, bool weak)
Definition: predtest.c:222
List * baserestrictinfo
Definition: pathnodes.h:985
RelOptKind reloptkind
Definition: pathnodes.h:865
Expr * clause
Definition: pathnodes.h:2575

References Assert, RelOptInfo::baserestrictinfo, RestrictInfo::clause, constraint_exclusion, CONSTRAINT_EXCLUSION_OFF, CONSTRAINT_EXCLUSION_ON, CONSTRAINT_EXCLUSION_PARTITION, contain_mutable_functions(), DatumGetBool(), get_relation_constraints(), RangeTblEntry::inh, IS_SIMPLE_REL, IsA, lappend(), lfirst, NIL, predicate_refuted_by(), RangeTblEntry::relid, RELOPT_BASEREL, RELOPT_OTHER_MEMBER_REL, RelOptInfo::reloptkind, root, RTE_RELATION, and RangeTblEntry::rtekind.

Referenced by set_append_rel_size(), and set_rel_size().

◆ restriction_selectivity()

Selectivity restriction_selectivity ( PlannerInfo root,
Oid  operatorid,
List args,
Oid  inputcollid,
int  varRelid 
)

Definition at line 1967 of file plancat.c.

1972{
1973 RegProcedure oprrest = get_oprrest(operatorid);
1974 float8 result;
1975
1976 /*
1977 * if the oprrest procedure is missing for whatever reason, use a
1978 * selectivity of 0.5
1979 */
1980 if (!oprrest)
1981 return (Selectivity) 0.5;
1982
1983 result = DatumGetFloat8(OidFunctionCall4Coll(oprrest,
1984 inputcollid,
1986 ObjectIdGetDatum(operatorid),
1988 Int32GetDatum(varRelid)));
1989
1990 if (result < 0.0 || result > 1.0)
1991 elog(ERROR, "invalid restriction selectivity: %f", result);
1992
1993 return (Selectivity) result;
1994}
Datum OidFunctionCall4Coll(Oid functionId, Oid collation, Datum arg1, Datum arg2, Datum arg3, Datum arg4)
Definition: fmgr.c:1442
RegProcedure get_oprrest(Oid opno)
Definition: lsyscache.c:1557
static Datum Int32GetDatum(int32 X)
Definition: postgres.h:217

References generate_unaccent_rules::args, DatumGetFloat8(), elog, ERROR, get_oprrest(), Int32GetDatum(), ObjectIdGetDatum(), OidFunctionCall4Coll(), PointerGetDatum(), and root.

Referenced by clause_selectivity_ext(), rowcomparesel(), and test_support_func().

Variable Documentation

◆ get_relation_info_hook

PGDLLIMPORT get_relation_info_hook_type get_relation_info_hook
extern

Definition at line 60 of file plancat.c.

Referenced by get_relation_info().