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Fix overly-enthusiastic Assert in printing of Param reference expressions.

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A NestLoopParam's value can only be a Var or Aggref, but this isn't the
case in general for SubPlan parameters, so print_parameter_expr had better
be prepared to cope.  Brain fade in my recent patch to print the referenced
expression instead of just printing $N for PARAM_EXEC Params.  Per report
from Pavel Stehule.
This commit is contained in:
Tom Lane 2010-10-25 14:25:10 -04:00
parent ef55e294e6
commit c6873eac4c
1 changed files with 12 additions and 3 deletions
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15
src/backend/utils/adt/ruleutils.c
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@ -4368,6 +4368,7 @@ print_parameter_expr(Node *expr, ListCell *ancestor_cell,
{
deparse_namespace save_dpns;
bool save_varprefix;
bool need_paren;
/* Switch attention to the ancestor plan node */
push_ancestor_plan(dpns, ancestor_cell, &save_dpns);
@ -4380,13 +4381,21 @@ print_parameter_expr(Node *expr, ListCell *ancestor_cell,
context->varprefix = true;
/*
* We don't need to add parentheses because a Param's expansion is
* (currently) always a Var or Aggref.
* A Param's expansion is typically a Var, Aggref, or upper-level Param,
* which wouldn't need extra parentheses. Otherwise, insert parens to
* ensure the expression looks atomic.
*/
Assert(IsA(expr, Var) || IsA(expr, Aggref));
need_paren = !(IsA(expr, Var) ||
IsA(expr, Aggref) ||
IsA(expr, Param));
if (need_paren)
appendStringInfoChar(context->buf, '(');
get_rule_expr(expr, context, false);
if (need_paren)
appendStringInfoChar(context->buf, ')');
context->varprefix = save_varprefix;
pop_ancestor_plan(dpns, &save_dpns);