Github user shivzone commented on a diff in the pull request:
https://github.com/apache/incubator-hawq/pull/968#discussion_r84387054
--- Diff: src/backend/access/external/pxffilters.c ---
@@ -406,6 +406,22 @@ pxf_serialize_filter_list(List *expressionItems)
appendStringInfo(resbuf, "%c%d",
PXF_LOGICAL_OPERATOR_CODE, boolType);
break;
}
+ case T_NullTest:
+ {
+ elog(DEBUG1, "pxf_serialize_filter_list: node
tag %d (T_NullTest)", tag);
+ NullTest *expr = (NullTest *) node;
+
+ /* filter expression for T_NullTest will not
have any constant value */
+ if (expr->nulltesttype == IS_NULL)
--- End diff --
good point
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