[PATCH][BUG FIX] Potential uninitialized vars used.

Hi,
Var TargetEntry *tle;
Have several paths where can it fail.

Can anyone check this bug fix?

--- \dll\postgresql-12.0\a\backend\parser\parse_expr.c Mon Sep 30 17:06:55 2019
+++ parse_expr.c Tue Nov 12 12:43:07 2019
@@ -349,6 +349,7 @@
errmsg("DEFAULT is not allowed in this context"),
parser_errposition(pstate,
((SetToDefault *) expr)->location)));
+ result = NULL; /* keep compiler quiet */
break;

/*
@@ -1637,11 +1638,13 @@
pstate->p_multiassign_exprs = lappend(pstate->p_multiassign_exprs,
tle);
}
- else
+ else {
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("source for a multiple-column UPDATE item must be a sub-SELECT or ROW() expression"),
parser_errposition(pstate, exprLocation(maref->source))));
+ return NULL;
+ }
}
else
{
@@ -1653,6 +1656,10 @@
Assert(pstate->p_multiassign_exprs != NIL);
tle = (TargetEntry *) llast(pstate->p_multiassign_exprs);
}
+ if (tle == NULL) {
+ elog(ERROR, "unexpected expr type in multiassign list");
+ return NULL; /* keep compiler quiet */
+ }

/*
* Emit the appropriate output expression for the current column