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Allow type resolution for UNKNOWN arguments to functions to fall back to 

any available string type. Previously, all candidate choices must have
 fallen within the same "type category" for PostgreSQL to be willing to
 choose any of them.
Need to apply the same fixup to operator type resolution.
This commit is contained in:
Thomas G. Lockhart 2000-11-06 15:42:30 +00:00
parent 493635b25f
commit 155e0b998a
1 changed files with 21 additions and 3 deletions
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24
src/backend/parser/parse_func.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parse_func.c,v 1.91 2000/09/29 18:21:36 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/parse_func.c,v 1.92 2000/11/06 15:42:30 thomas Exp $
*
*-------------------------------------------------------------------------
*/
@ -921,6 +921,10 @@ func_select_candidate(int nargs,
* eliminate some candidates because they are non-preferred at the
* first slot, we won't notice that they didn't have the same type
* category for a later slot.
* XXX Hmm. How else would you do this? These candidates are here because
* they all have the same number of matches on arguments with explicit
* types, so from here on left-to-right resolution is as good as any.
* Need a counterexample to see otherwise...
*/
for (i = 0; i < nargs; i++)
{
@ -944,8 +948,21 @@ func_select_candidate(int nargs,
}
else if (current_category != slot_category)
{
/* punt if more than one category for this slot */
return NULL;
/* started out as unknown type, so give preference to string type, if available */
if (current_category == STRING_TYPE)
{
/* forget all previous candidates */
candidates = current_candidate;
last_candidate = current_candidate;
}
else if (slot_category == STRING_TYPE)
{
/* forget this candidate */
if (last_candidate)
last_candidate->next = current_candidate->next;
else
candidates = current_candidate->next;
}
}
else if (current_type != slot_type)
{
@ -982,6 +999,7 @@ func_select_candidate(int nargs,
return NULL; /* no remaining candidates */
if (candidates->next != NULL)
return NULL; /* more than one remaining candidate */
return candidates->args;
} /* func_select_candidate() */