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108 lines
3.9 KiB
108 lines
3.9 KiB
/*-------------------------------------------------------------------------
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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) 1996-2016, 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/optimizer/clauses.h
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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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#define is_opclause(clause) ((clause) != NULL && IsA(clause, OpExpr))
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#define is_funcclause(clause) ((clause) != NULL && IsA(clause, FuncExpr))
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typedef struct
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{
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int numWindowFuncs; /* total number of WindowFuncs found */
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Index maxWinRef; /* windowFuncs[] is indexed 0 .. maxWinRef */
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List **windowFuncs; /* lists of WindowFuncs for each winref */
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} WindowFuncLists;
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/*
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* PartialAggType
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* PartialAggType stores whether partial aggregation is allowed and
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* which context it is allowed in. We require three states here as there are
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* two different contexts in which partial aggregation is safe. For aggregates
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* which have an 'stype' of INTERNAL, it is okay to pass a pointer to the
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* aggregate state within a single process, since the datum is just a
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* pointer. In cases where the aggregate state must be passed between
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* different processes, for example during parallel aggregation, passing
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* pointers directly is not going to work.
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*/
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typedef enum
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{
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PAT_ANY = 0, /* Any type of partial aggregation is okay. */
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PAT_INTERNAL_ONLY, /* Some aggregates support only internal mode. */
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PAT_DISABLED /* Some aggregates don't support partial mode at all */
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} PartialAggType;
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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 Node *get_leftop(const Expr *clause);
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extern Node *get_rightop(const Expr *clause);
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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 or_clause(Node *clause);
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extern Expr *make_orclause(List *orclauses);
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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 PartialAggType aggregates_allow_partial(Node *clause);
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extern bool contain_agg_clause(Node *clause);
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extern void count_agg_clauses(PlannerInfo *root, Node *clause,
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AggClauseCosts *costs, bool finalizeAggs,
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bool combineStates, bool serialStates);
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extern bool contain_window_function(Node *clause);
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extern WindowFuncLists *find_window_functions(Node *clause, Index maxWinRef);
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extern double expression_returns_set_rows(Node *clause);
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extern double tlist_returns_set_rows(List *tlist);
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extern bool contain_subplans(Node *clause);
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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 contain_volatile_functions_not_nextval(Node *clause);
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extern bool has_parallel_hazard(Node *node, bool allow_restricted);
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extern bool contain_nonstrict_functions(Node *clause);
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extern bool contain_leaked_vars(Node *clause);
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extern Relids find_nonnullable_rels(Node *clause);
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extern List *find_nonnullable_vars(Node *clause);
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extern List *find_forced_null_vars(Node *clause);
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extern Var *find_forced_null_var(Node *clause);
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extern bool is_pseudo_constant_clause(Node *clause);
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extern bool is_pseudo_constant_clause_relids(Node *clause, Relids relids);
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extern int NumRelids(Node *clause);
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extern void CommuteOpExpr(OpExpr *clause);
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extern void CommuteRowCompareExpr(RowCompareExpr *clause);
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extern Node *eval_const_expressions(PlannerInfo *root, Node *node);
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extern Node *estimate_expression_value(PlannerInfo *root, Node *node);
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extern Query *inline_set_returning_function(PlannerInfo *root,
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RangeTblEntry *rte);
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#endif /* CLAUSES_H */
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