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Add a paramtypmod field to Param nodes. This is dead weight for Params

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representing externally-supplied values, since the APIs that carry such
values only specify type not typmod.  However, for PARAM_SUBLINK Params
it is handy to carry the typmod of the sublink's output column.  This
is a much cleaner solution for the recently reported 'could not find
pathkey item to sort' and 'failed to find unique expression in subplan
tlist' bugs than my original 8.2-compatible patch.  Besides, someday we
might want to support typmods for external parameters ...
This commit is contained in:
Tom Lane
2006-12-10 22:13:27 +00:00
parent 314c7b642b
commit 9fa12ddda6
10 changed files with 50 additions and 47 deletions
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6
src/backend/parser/parse_expr.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/parse_expr.c,v 1.198 2006/10/04 00:29:55 momjian Exp $
* $PostgreSQL: pgsql/src/backend/parser/parse_expr.c,v 1.199 2006/12/10 22:13:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -572,6 +572,7 @@ transformParamRef(ParseState *pstate, ParamRef *pref)
param->paramkind = PARAM_EXTERN;
param->paramid = paramno;
param->paramtype = toppstate->p_paramtypes[paramno - 1];
param->paramtypmod = -1;
return (Node *) param;
}
@@ -1180,6 +1181,7 @@ transformSubLink(ParseState *pstate, SubLink *sublink)
param->paramkind = PARAM_SUBLINK;
param->paramid = tent->resno;
param->paramtype = exprType((Node *) tent->expr);
param->paramtypmod = exprTypmod((Node *) tent->expr);
right_list = lappend(right_list, param);
}
@@ -1721,6 +1723,8 @@ exprTypmod(Node *expr)
}
}
break;
case T_Param:
return ((Param *) expr)->paramtypmod;
case T_FuncExpr:
{
int32 coercedTypmod;