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Initially, we use this only to eliminate calls to the varchar() function in cases where the length is not being reduced and, therefore, the function call is equivalent to a RelabelType operation. The most significant effect of this is that we can avoid a table rewrite when changing a varchar(X) column to a varchar(Y) column, where Y > X. Noah Misch, reviewed by me and Alexey Klyukin
50 lines
1.8 KiB
C
50 lines
1.8 KiB
C
/*-------------------------------------------------------------------------
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*
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* parse_clause.h
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* handle clauses in parser
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*
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*
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* Portions Copyright (c) 1996-2011, 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/parser/parse_clause.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PARSE_CLAUSE_H
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#define PARSE_CLAUSE_H
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#include "parser/parse_node.h"
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extern void transformFromClause(ParseState *pstate, List *frmList);
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extern int setTargetTable(ParseState *pstate, RangeVar *relation,
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bool inh, bool alsoSource, AclMode requiredPerms);
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extern bool interpretInhOption(InhOption inhOpt);
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extern bool interpretOidsOption(List *defList);
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extern Node *transformWhereClause(ParseState *pstate, Node *clause,
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const char *constructName);
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extern Node *transformLimitClause(ParseState *pstate, Node *clause,
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const char *constructName);
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extern List *transformGroupClause(ParseState *pstate, List *grouplist,
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List **targetlist, List *sortClause,
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bool useSQL99);
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extern List *transformSortClause(ParseState *pstate, List *orderlist,
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List **targetlist, bool resolveUnknown, bool useSQL99);
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extern List *transformWindowDefinitions(ParseState *pstate,
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List *windowdefs,
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List **targetlist);
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extern List *transformDistinctClause(ParseState *pstate,
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List **targetlist, List *sortClause, bool is_agg);
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extern List *transformDistinctOnClause(ParseState *pstate, List *distinctlist,
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List **targetlist, List *sortClause);
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extern Index assignSortGroupRef(TargetEntry *tle, List *tlist);
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extern bool targetIsInSortList(TargetEntry *tle, Oid sortop, List *sortList);
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extern Node *relabel_to_typmod(Node *expr, int32 typmod);
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#endif /* PARSE_CLAUSE_H */
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