[jira] [Updated] (CALCITE-2803) Identify expanded IS NOT DISTINCT FROM expression when pushing project past join

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-2803?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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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