Github user shivzone commented on a diff in the pull request: https://github.com/apache/incubator-hawq/pull/981#discussion_r85998628 --- Diff: src/backend/access/external/pxffilters.c --- @@ -357,6 +393,46 @@ pxf_serialize_filter_list(List *expressionItems) switch (tag) { + case T_Var: + { + elog(DEBUG1, "pxf_serialize_filter_list: node tag %d (T_Var)", tag); + PxfFilterDesc *filter = (PxfFilterDesc *) palloc0(sizeof(PxfFilterDesc)); + Var *var = (Var *) node; + if (var_to_pxffilter(var, filter)) + { + PxfOperand l = filter->l; + PxfOperand r = filter->r; + PxfOperatorCode o = filter->op; + if (pxfoperand_is_attr(l) && pxfoperand_is_scalar_const(r)) --- End diff -- Can we have a scenario which is left operand is scalar const and right operand is attirbute ?
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