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https://issues.apache.org/jira/browse/CALCITE-935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14972083#comment-14972083
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Pengcheng Xiong commented on CALCITE-935:
-----------------------------------------
I plan to submit a patch myself soon.
> Improve ReduceExpressionRule to deal with multiple "equals to literal" in
> predicate
> -----------------------------------------------------------------------------------
>
> Key: CALCITE-935
> URL: https://issues.apache.org/jira/browse/CALCITE-935
> Project: Calcite
> Issue Type: Bug
> Reporter: Pengcheng Xiong
> Assignee: Julian Hyde
>
> In ReduceExpressionRule.java,
> L396-397:
> final ImmutableMap<RexNode, RexLiteral> constants =
> predicateConstants(predicates);
> The query is "select * from src where (key='12' and key is
> null);" Here 'key' is a string type and it is one of the columns of 'src'
> table.
> Then we will have predicates [=($0, '12'), isnull($0)], which is the input of
> the
> predicateConstants, and the function will return "{$0='12'}"
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