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https://issues.apache.org/jira/browse/CALCITE-6448?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhen Chen resolved CALCITE-6448.
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Resolution: Duplicate
Fixed via CALCITE-7258
> FilterReduceExpressionsRule returns empty RelNode for RexLiterals
> -----------------------------------------------------------------
>
> Key: CALCITE-6448
> URL: https://issues.apache.org/jira/browse/CALCITE-6448
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Soumyakanti Das
> Assignee: Soumyakanti Das
> Priority: Major
> Labels: pull-request-available
>
> In Hive, for simple queries with {{WHERE 'foo'}} we get an empty result,
> where as for simple queries with {{WHERE t.stringColumn}} we get non-empty
> result.
> Currently in {{FilterReduceExpressionsRule}}, all {{RexLiteral}}s are
> converted to empty values by
> {code:java}
> else if (newConditionExp instanceof RexLiteral
> || RexUtil.isNullLiteral(newConditionExp, true)) {
> call.transformTo(createEmptyRelOrEquivalent(call, filter));
> {code}
> This might be not inline with {{RexLiteral#isAlwaysFalse}}, and it might be
> safer to leave the literal as it is.
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