diff options
Diffstat (limited to 'src/backend/optimizer/util/clauses.c')
| -rw-r--r-- | src/backend/optimizer/util/clauses.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/src/backend/optimizer/util/clauses.c b/src/backend/optimizer/util/clauses.c index 442ebad1e7b..de9ef509382 100644 --- a/src/backend/optimizer/util/clauses.c +++ b/src/backend/optimizer/util/clauses.c @@ -7,7 +7,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/optimizer/util/clauses.c,v 1.42 1999/07/25 23:07:25 tgl Exp $ + * $Header: /cvsroot/pgsql/src/backend/optimizer/util/clauses.c,v 1.43 1999/07/27 03:51:04 tgl Exp $ * * HISTORY * AUTHOR DATE MAJOR EVENT @@ -293,8 +293,9 @@ make_andclause(List *andclauses) /* * Sometimes (such as in the result of cnfify), we use lists of expression - * nodes with implicit AND semantics. This function converts back to an - * explicit-AND representation. + * nodes with implicit AND semantics. These functions convert between an + * AND-semantics expression list and the ordinary representation of a + * boolean expression. */ Expr * make_ands_explicit(List *andclauses) @@ -307,6 +308,17 @@ make_ands_explicit(List *andclauses) return make_andclause(andclauses); } +List * +make_ands_implicit(Expr *clause) +{ + if (clause == NULL) + return NIL; + else if (and_clause((Node *) clause)) + return clause->args; + else + return lcons(clause, NIL); +} + /***************************************************************************** * CASE clause functions *****************************************************************************/ |