diff options
Diffstat (limited to 'src/backend/optimizer/util/clauses.c')
| -rw-r--r-- | src/backend/optimizer/util/clauses.c | 43 |
1 files changed, 7 insertions, 36 deletions
diff --git a/src/backend/optimizer/util/clauses.c b/src/backend/optimizer/util/clauses.c index 4da9f47dec..bde0966f4a 100644 --- a/src/backend/optimizer/util/clauses.c +++ b/src/backend/optimizer/util/clauses.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/optimizer/util/clauses.c,v 1.212 2006/06/16 18:42:22 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/optimizer/util/clauses.c,v 1.213 2006/07/01 18:38:33 tgl Exp $ * * HISTORY * AUTHOR DATE MAJOR EVENT @@ -1052,14 +1052,13 @@ is_strict_saop(ScalarArrayOpExpr *expr, bool falseOK) /* * is_pseudo_constant_clause - * Detect whether a clause is "constant", ie, it contains no variables - * of the current query level and no uses of volatile functions. - * Such a clause is not necessarily a true constant: it can still contain + * Detect whether an expression is "pseudo constant", ie, it contains no + * variables of the current query level and no uses of volatile functions. + * Such an expr is not necessarily a true constant: it can still contain * Params and outer-level Vars, not to mention functions whose results - * may vary from one statement to the next. However, the clause's value + * may vary from one statement to the next. However, the expr's value * will be constant over any one scan of the current query, so it can be - * used as an indexscan key or (if a top-level qual) can be pushed up to - * become a gating qual. + * used as, eg, an indexscan key. */ bool is_pseudo_constant_clause(Node *clause) @@ -1079,7 +1078,7 @@ is_pseudo_constant_clause(Node *clause) /* * is_pseudo_constant_clause_relids * Same as above, except caller already has available the var membership - * of the clause; this lets us avoid the contain_var_clause() scan. + * of the expression; this lets us avoid the contain_var_clause() scan. */ bool is_pseudo_constant_clause_relids(Node *clause, Relids relids) @@ -1090,34 +1089,6 @@ is_pseudo_constant_clause_relids(Node *clause, Relids relids) return false; } -/* - * pull_constant_clauses - * Scan through a list of qualifications and separate "constant" quals - * from those that are not. - * - * Returns a list of the pseudo-constant clauses in constantQual and the - * remaining quals as the return value. - */ -List * -pull_constant_clauses(List *quals, List **constantQual) -{ - List *constqual = NIL, - *restqual = NIL; - ListCell *q; - - foreach(q, quals) - { - Node *qual = (Node *) lfirst(q); - - if (is_pseudo_constant_clause(qual)) - constqual = lappend(constqual, qual); - else - restqual = lappend(restqual, qual); - } - *constantQual = constqual; - return restqual; -} - /***************************************************************************** * Tests on clauses of queries |