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db436adf76
sort order down into planner, instead of handling it only at the very top level of the planner. This fixes many things. An explicit sort is now avoided if there is a cheaper alternative (typically an indexscan) not only for ORDER BY, but also for the internal sort of GROUP BY. It works even when there is no other reason (such as a WHERE condition) to consider the indexscan. It works for indexes on functions. It works for indexes on functions, backwards. It's just so cool... CAUTION: I have changed the representation of SortClause nodes, therefore THIS UPDATE BREAKS STORED RULES. You will need to initdb.
53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
/*-------------------------------------------------------------------------
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*
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* parse_func.h
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*
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*
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: parse_func.h,v 1.19 1999/08/21 03:49:17 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PARSER_FUNC_H
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#define PARSER_FUNC_H
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#include "parser/parse_node.h"
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#define MAXFARGS 8 /* max # args to a c or postquel function */
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/*
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* This structure is used to explore the inheritance hierarchy above
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* nodes in the type tree in order to disambiguate among polymorphic
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* functions.
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*/
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typedef struct _InhPaths
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{
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int nsupers; /* number of superclasses */
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Oid self; /* this class */
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Oid *supervec; /* vector of superclasses */
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} InhPaths;
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/*
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* This structure holds a list of possible functions or operators that
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* agree with the known name and argument types of the function/operator.
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*/
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typedef struct _CandidateList
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{
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Oid *args;
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struct _CandidateList *next;
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} *CandidateList;
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extern Node *ParseNestedFuncOrColumn(ParseState *pstate, Attr *attr,
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int *curr_resno, int precedence);
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extern Node *ParseFuncOrColumn(ParseState *pstate, char *funcname, List *fargs,
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int *curr_resno, int precedence);
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extern List *setup_base_tlist(Oid typeid);
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extern void func_error(char *caller, char *funcname,
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int nargs, Oid *argtypes, char *msg);
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#endif /* PARSE_FUNC_H */
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