diff options
Diffstat (limited to 'src/backend/optimizer/util/clauses.c')
| -rw-r--r-- | src/backend/optimizer/util/clauses.c | 37 |
1 files changed, 36 insertions, 1 deletions
diff --git a/src/backend/optimizer/util/clauses.c b/src/backend/optimizer/util/clauses.c index b6ac7786aa7..0f7d8dc31fc 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 1.182 2004/10/07 18:38:49 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/optimizer/util/clauses.c,v 1.183 2004/10/22 17:20:05 tgl Exp $ * * HISTORY * AUTHOR DATE MAJOR EVENT @@ -1022,6 +1022,41 @@ CommuteClause(OpExpr *clause) } /* + * strip_implicit_coercions: remove implicit coercions at top level of tree + * + * Note: there isn't any useful thing we can do with a RowExpr here, so + * just return it unchanged, even if it's marked as an implicit coercion. + */ +Node * +strip_implicit_coercions(Node *node) +{ + if (node == NULL) + return NULL; + if (IsA(node, FuncExpr)) + { + FuncExpr *f = (FuncExpr *) node; + + if (f->funcformat == COERCE_IMPLICIT_CAST) + return strip_implicit_coercions(linitial(f->args)); + } + else if (IsA(node, RelabelType)) + { + RelabelType *r = (RelabelType *) node; + + if (r->relabelformat == COERCE_IMPLICIT_CAST) + return strip_implicit_coercions((Node *) r->arg); + } + else if (IsA(node, CoerceToDomain)) + { + CoerceToDomain *c = (CoerceToDomain *) node; + + if (c->coercionformat == COERCE_IMPLICIT_CAST) + return strip_implicit_coercions((Node *) c->arg); + } + return node; +} + +/* * set_coercionform_dontcare: set all CoercionForm fields to COERCE_DONTCARE * * This is used to make index expressions and index predicates more easily |