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https://issues.apache.org/jira/browse/CALCITE-6904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17937240#comment-17937240
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Mihai Budiu commented on CALCITE-6904:
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I don't really understand this problem, can you provide a test case to
illustrate what is going wrong?
> IS_NOT_DISTINCT_FROM is converted error in ElementerableJoinRule
> ----------------------------------------------------------------
>
> Key: CALCITE-6904
> URL: https://issues.apache.org/jira/browse/CALCITE-6904
> Project: Calcite
> Issue Type: Bug
> Reporter: Zhen Chen
> Priority: Major
>
> The convert() method of ElementerableJoinRule incorrectly converts the
> condition of IS_NOT_DISTINCT_FROM , which is considered an equivalence
> condition in calcite and carries a `filterNulls` to save whether to perform
> equivalence processing on NULL. However, when converting to
> ElementerableJoin, the filterNulls are ignored, resulting in
> `IS_NOT_DISTINCT_FROM ($0, $1)` being converted to `=($0, $1)`.
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