Danny Chen created CALCITE-4225:
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Summary: 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
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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