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https://issues.apache.org/jira/browse/CALCITE-2617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16651422#comment-16651422
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Stamatis Zampetakis commented on CALCITE-2617:
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[~julianhyde] , I updated the PR with your comments.
# The constructors are updated with an appropriate javadoc.
# HAS_CORRELATION field is replaced with a lamda.
> 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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