[jira] [Resolved] (CALCITE-2617) FilterProjectTransposeRule should allow filter conditions with correlated variables to be pushed down

["Julian Hyde (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-2617?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julian Hyde resolved CALCITE-2617.
----------------------------------
    Resolution: Fixed

Fixed in [6284d3c8|http://git-wip-us.apache.org/repos/asf/calcite/commit/6284d3c8]; thanks for the PR, [~zabetak]! (I added some tests.)

> FilterProjectTransposeRule should allow filter conditions with correlated variables to be pushed down
> -----------------------------------------------------------------------------------------------------
>
>                 Key: CALCITE-2617
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2617
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 1.17.0
>            Reporter: Stamatis Zampetakis
>            Assignee: Julian Hyde
>            Priority: Major
>             Fix For: 1.18.0
>
>
> The rule always forbids conditions with correlated variables to be pushed down (as of [CALCITE-769|https://issues.apache.org/jira/browse/CALCITE-769] to avoid certain problems in the decorrelation of the query). However, in the general context of query optimization, it is beneficial to push-down filters and the fact that there is a correlated variable is not a reason to skip this optimization. 
> In order to avoid regressions, and at the same time enable correlated conditions to be pushed down we should make the pushing of correlated variables configurable. 



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