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https://issues.apache.org/jira/browse/CALCITE-4225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17219532#comment-17219532
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Danny Chen commented on CALCITE-4225:
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I'm planning to merge within 24 hours ~
> Make RelDecorrelator pluggable
> ------------------------------
>
> Key: CALCITE-4225
> URL: https://issues.apache.org/jira/browse/CALCITE-4225
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.25.0
> Reporter: Danny Chen
> Assignee: Danny Chen
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.27.0
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> {{RelDecorrelator}} is our core component that decorrelates the queries. But
> actually, the pattern it can decorrelate successfully is very limited. And it
> often causes bug because it decorrelates into a wrong plan (with non-correct
> sementics).
> When there are bugs there, the downstream project can only wait for the
> version upgrade (if it is fixed in Calcite master), or they copy the whole
> Java class and override the Calcite one which is hard to maintain.
> It would be nice if we can make the decorrelation logic pluggable. e.g. we
> can control how a RelNode was decorrelated(not a coarse-grained flag to
> turn-on/off the decorrelation).
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