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https://issues.apache.org/jira/browse/CALCITE-6902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17936962#comment-17936962
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Julian Hyde commented on CALCITE-6902:
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Not immediately. But you could imagine some people configuring Calcite to say
that IS_DISTINCT_FROM is an operator that is implemented not desugared, and
they would be able to write rules that work on Join operators with conditions
'$1 is not distinct from $8'. We would have to get that configuration right.
Otherwise it would be chaos, because we wouldn't know what is the valid set of
operators at a given phase.
> IS NOT DISTINCT FROM does not implement Implementor
> ---------------------------------------------------
>
> Key: CALCITE-6902
> URL: https://issues.apache.org/jira/browse/CALCITE-6902
> Project: Calcite
> Issue Type: Improvement
> Reporter: Zhen Chen
> Assignee: Zhen Chen
> Priority: Major
>
> We need to have an Implementor for `IS NOT DISTINCT FROM`.
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