diff options
Diffstat (limited to 'src/backend/parser/parse_coerce.c')
| -rw-r--r-- | src/backend/parser/parse_coerce.c | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/src/backend/parser/parse_coerce.c b/src/backend/parser/parse_coerce.c index 38f044217e5..283fd302407 100644 --- a/src/backend/parser/parse_coerce.c +++ b/src/backend/parser/parse_coerce.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/parser/parse_coerce.c,v 2.57 2001/05/22 16:37:16 petere Exp $ + * $Header: /cvsroot/pgsql/src/backend/parser/parse_coerce.c,v 2.58 2001/06/19 22:39:11 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -321,6 +321,30 @@ coerce_type_typmod(ParseState *pstate, Node *node, } +/* coerce_to_boolean() + * Coerce an argument of a construct that requires boolean input + * (AND, OR, NOT, etc). + * + * If successful, update *pnode to be the transformed argument (if any + * transformation is needed), and return TRUE. If fail, return FALSE. + * (The caller must check for FALSE and emit a suitable error message.) + */ +bool +coerce_to_boolean(ParseState *pstate, Node **pnode) +{ + Oid inputTypeId = exprType(*pnode); + Oid targetTypeId; + + if (inputTypeId == BOOLOID) + return true; /* no work */ + targetTypeId = BOOLOID; + if (! can_coerce_type(1, &inputTypeId, &targetTypeId)) + return false; /* fail, but let caller choose error msg */ + *pnode = coerce_type(pstate, *pnode, inputTypeId, targetTypeId, -1); + return true; +} + + /* select_common_type() * Determine the common supertype of a list of input expression types. * This is used for determining the output type of CASE and UNION |