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https://issues.apache.org/jira/browse/CALCITE-2803?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated CALCITE-2803:
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Labels: pull-request-available (was: )
> Identify expanded IS NOT DISTINCT FROM expression when pushing project past
> join
> --------------------------------------------------------------------------------
>
> Key: CALCITE-2803
> URL: https://issues.apache.org/jira/browse/CALCITE-2803
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Laurent Goujon
> Priority: Major
> Labels: pull-request-available
>
> {{IS NOT DISTINCT FROM}} expressions in join condition might actually be
> considered as equi-join conditions, and {{RelOptUtil#splitJoinConditions()}}
> has support for it. But some other join related functions/rules don't.
> One of them is {{ProjectJoinTransposeRule}} which tries to push project
> expressions below the join, but ends up modifying the join expression too by
> pushing complex expression below.
> For example expression {{OR(AND(IS_NULL($1), IS_NULL($4)), EQUALS($1,$4))}}
> will be changed into {{OR(AND($3, $6), EQUALS($1, $5))}} which makes it
> harder/impossible for {{RelOptUtil#splitJoinConditions()}} to identify an
> {{IS NOT DISTINCT FROM}} equi-join condition.
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