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3389a110d4
returns-set boolean field in Func and Oper nodes. This allows cleaner, more reliable tests for expressions returning sets in the planner and parser. For example, a WHERE clause returning a set is now detected and complained of in the parser, not only at runtime.
79 lines
2.6 KiB
C
79 lines
2.6 KiB
C
/*-------------------------------------------------------------------------
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*
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* clauses.h
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* prototypes for clauses.c.
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*
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*
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* Portions Copyright (c) 1996-2001, 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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* $Id: clauses.h,v 1.52 2002/05/12 23:43:04 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef CLAUSES_H
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#define CLAUSES_H
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#include "nodes/relation.h"
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extern Expr *make_clause(int type, Node *oper, List *args);
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extern bool is_opclause(Node *clause);
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extern Expr *make_opclause(Oper *op, Var *leftop, Var *rightop);
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extern Var *get_leftop(Expr *clause);
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extern Var *get_rightop(Expr *clause);
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extern bool is_funcclause(Node *clause);
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extern Expr *make_funcclause(Func *func, List *funcargs);
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extern bool or_clause(Node *clause);
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extern Expr *make_orclause(List *orclauses);
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extern bool not_clause(Node *clause);
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extern Expr *make_notclause(Expr *notclause);
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extern Expr *get_notclausearg(Expr *notclause);
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extern bool and_clause(Node *clause);
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extern Expr *make_andclause(List *andclauses);
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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 bool contain_agg_clause(Node *clause);
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extern List *pull_agg_clause(Node *clause);
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extern bool expression_returns_set(Node *clause);
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extern bool contain_subplans(Node *clause);
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extern List *pull_subplans(Node *clause);
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extern void check_subplans_for_ungrouped_vars(Query *query);
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extern bool contain_mutable_functions(Node *clause);
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extern bool contain_volatile_functions(Node *clause);
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extern bool is_pseudo_constant_clause(Node *clause);
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extern List *pull_constant_clauses(List *quals, List **constantQual);
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extern bool has_distinct_on_clause(Query *query);
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extern void clause_get_relids_vars(Node *clause, Relids *relids, List **vars);
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extern int NumRelids(Node *clause);
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extern void CommuteClause(Expr *clause);
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extern Node *eval_const_expressions(Node *node);
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extern bool expression_tree_walker(Node *node, bool (*walker) (),
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void *context);
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extern Node *expression_tree_mutator(Node *node, Node *(*mutator) (),
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void *context);
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extern bool query_tree_walker(Query *query, bool (*walker) (),
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void *context, bool visitQueryRTEs);
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extern void query_tree_mutator(Query *query, Node *(*mutator) (),
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void *context, bool visitQueryRTEs);
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#define is_subplan(clause) ((clause) != NULL && \
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IsA(clause, Expr) && \
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((Expr *) (clause))->opType == SUBPLAN_EXPR)
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#endif /* CLAUSES_H */
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