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https://issues.apache.org/jira/browse/CALCITE-4225?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Danny Chen updated CALCITE-4225:
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Description:
{{RelDecorrelator}} is out core component that decorrelates the queries. But
actually, the pattern it can decorrelates 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).
was:
{{ RelDecorrelator }} is out core component that decorrelates the queries. But
actually, the pattern it can decorrelates 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).
> 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
> Fix For: 1.26.0
>
>
> {{RelDecorrelator}} is out core component that decorrelates the queries. But
> actually, the pattern it can decorrelates 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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