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https://issues.apache.org/jira/browse/CALCITE-2240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16427140#comment-16427140
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Zoltan Haindrich commented on CALCITE-2240:
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opened pullrequest: https://github.com/apache/calcite/pull/658
> Predicate push into CASE statment doesn't happen in some cases
> --------------------------------------------------------------
>
> Key: CALCITE-2240
> URL: https://issues.apache.org/jira/browse/CALCITE-2240
> Project: Calcite
> Issue Type: Bug
> Reporter: Zoltan Haindrich
> Assignee: Julian Hyde
> Priority: Major
>
> [CaseShuttle|https://github.com/apache/calcite/blob/8139acb78b100483fbafb078fb82d07f921abef0/core/src/main/java/org/apache/calcite/rel/rules/ReduceExpressionsRule.java#L562]
> may make the optimization but the functions return value doesn't depend on
> that.
> For the following query the =1 is not pushed into the case.
> {code}
> select empno from emp where case when sal > 1000 then empno else sal end = 1
> {code}
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