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fc0438b4e8
Add WITHOUT OVERLAPS clause to PRIMARY KEY and UNIQUE constraints. These are backed by GiST indexes instead of B-tree indexes, since they are essentially exclusion constraints with = for the scalar parts of the key and && for the temporal part. (previously committed as 46a0cd4cefb, reverted by 46a0cd4cefb; the new part is this:) Because 'empty' && 'empty' is false, the temporal PK/UQ constraint allowed duplicates, which is confusing to users and breaks internal expectations. For instance, when GROUP BY checks functional dependencies on the PK, it allows selecting other columns from the table, but in the presence of duplicate keys you could get the value from any of their rows. So we need to forbid empties. This all means that at the moment we can only support ranges and multiranges for temporal PK/UQs, unlike the original patch (above). Documentation and tests for this are added. But this could conceivably be extended by introducing some more general support for the notion of "empty" for other types. Author: Paul A. Jungwirth <pj@illuminatedcomputing.com> Reviewed-by: Peter Eisentraut <peter@eisentraut.org> Reviewed-by: jian he <jian.universality@gmail.com> Discussion: https://www.postgresql.org/message-id/flat/CA+renyUApHgSZF9-nd-a0+OPGharLQLO=mDHcY4_qQ0+noCUVg@mail.gmail.com
128 lines
4.3 KiB
C
128 lines
4.3 KiB
C
/*-------------------------------------------------------------------------
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*
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* makefuncs.h
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* prototypes for the creator functions of various nodes
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*
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*
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* Portions Copyright (c) 1996-2024, 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/nodes/makefuncs.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef MAKEFUNC_H
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#define MAKEFUNC_H
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#include "nodes/execnodes.h"
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#include "nodes/parsenodes.h"
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extern A_Expr *makeA_Expr(A_Expr_Kind kind, List *name,
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Node *lexpr, Node *rexpr, int location);
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extern A_Expr *makeSimpleA_Expr(A_Expr_Kind kind, char *name,
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Node *lexpr, Node *rexpr, int location);
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extern Var *makeVar(int varno,
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AttrNumber varattno,
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Oid vartype,
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int32 vartypmod,
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Oid varcollid,
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Index varlevelsup);
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extern Var *makeVarFromTargetEntry(int varno,
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TargetEntry *tle);
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extern Var *makeWholeRowVar(RangeTblEntry *rte,
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int varno,
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Index varlevelsup,
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bool allowScalar);
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extern TargetEntry *makeTargetEntry(Expr *expr,
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AttrNumber resno,
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char *resname,
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bool resjunk);
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extern TargetEntry *flatCopyTargetEntry(TargetEntry *src_tle);
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extern FromExpr *makeFromExpr(List *fromlist, Node *quals);
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extern Const *makeConst(Oid consttype,
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int32 consttypmod,
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Oid constcollid,
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int constlen,
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Datum constvalue,
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bool constisnull,
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bool constbyval);
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extern Const *makeNullConst(Oid consttype, int32 consttypmod, Oid constcollid);
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extern Node *makeBoolConst(bool value, bool isnull);
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extern Expr *makeBoolExpr(BoolExprType boolop, List *args, int location);
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extern Alias *makeAlias(const char *aliasname, List *colnames);
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extern RelabelType *makeRelabelType(Expr *arg, Oid rtype, int32 rtypmod,
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Oid rcollid, CoercionForm rformat);
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extern RangeVar *makeRangeVar(char *schemaname, char *relname, int location);
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extern TypeName *makeTypeName(char *typnam);
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extern TypeName *makeTypeNameFromNameList(List *names);
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extern TypeName *makeTypeNameFromOid(Oid typeOid, int32 typmod);
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extern ColumnDef *makeColumnDef(const char *colname,
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Oid typeOid, int32 typmod, Oid collOid);
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extern FuncExpr *makeFuncExpr(Oid funcid, Oid rettype, List *args,
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Oid funccollid, Oid inputcollid, CoercionForm fformat);
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extern FuncCall *makeFuncCall(List *name, List *args,
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CoercionForm funcformat, int location);
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extern Expr *make_opclause(Oid opno, Oid opresulttype, bool opretset,
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Expr *leftop, Expr *rightop,
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Oid opcollid, Oid inputcollid);
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extern Expr *make_andclause(List *andclauses);
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extern Expr *make_orclause(List *orclauses);
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extern Expr *make_notclause(Expr *notclause);
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extern Node *make_and_qual(Node *qual1, Node *qual2);
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extern Expr *make_ands_explicit(List *andclauses);
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extern List *make_ands_implicit(Expr *clause);
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extern IndexInfo *makeIndexInfo(int numattrs, int numkeyattrs, Oid amoid,
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List *expressions, List *predicates,
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bool unique, bool nulls_not_distinct,
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bool isready, bool concurrent,
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bool summarizing, bool withoutoverlaps);
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extern Node *makeStringConst(char *str, int location);
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extern DefElem *makeDefElem(char *name, Node *arg, int location);
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extern DefElem *makeDefElemExtended(char *nameSpace, char *name, Node *arg,
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DefElemAction defaction, int location);
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extern GroupingSet *makeGroupingSet(GroupingSetKind kind, List *content, int location);
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extern VacuumRelation *makeVacuumRelation(RangeVar *relation, Oid oid, List *va_cols);
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extern JsonFormat *makeJsonFormat(JsonFormatType type, JsonEncoding encoding,
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int location);
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extern JsonValueExpr *makeJsonValueExpr(Expr *raw_expr, Expr *formatted_expr,
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JsonFormat *format);
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extern Node *makeJsonKeyValue(Node *key, Node *value);
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extern Node *makeJsonIsPredicate(Node *expr, JsonFormat *format,
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JsonValueType item_type, bool unique_keys,
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int location);
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extern JsonBehavior *makeJsonBehavior(JsonBehaviorType btype, Node *expr,
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int location);
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extern JsonTablePath *makeJsonTablePath(Const *pathvalue, char *pathname);
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extern JsonTablePathSpec *makeJsonTablePathSpec(char *string, char *name,
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int string_location,
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int name_location);
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#endif /* MAKEFUNC_H */
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