abhishekagarwal87 opened a new pull request #10697:
URL: https://github.com/apache/druid/pull/10697
As of now, if the left query in the JOIN has a filter present, we plan it as
the join between two query data sources even if the left source is a base
table. We had even introduced some custom calcite rules so that filters on join
query are not pushed into the children. However, for correlated queries, the
generated calcite plan is a left join with a filter on the left base table.
Hence, the execution of correlation queries is not efficient.
This PR adds the support for pushing filters into the left child. We would
add the support for the right child in a different PR and also get rid of the
custom calcite rules once that happens.
WIP right now as I am working on unit testing.
<hr>
This PR has:
- [ ] been self-reviewed.
- [ ] using the [concurrency
checklist](https://github.com/apache/druid/blob/master/dev/code-review/concurrency.md)
(Remove this item if the PR doesn't have any relation to concurrency.)
- [ ] added documentation for new or modified features or behaviors.
- [ ] added Javadocs for most classes and all non-trivial methods. Linked
related entities via Javadoc links.
- [ ] added or updated version, license, or notice information in
[licenses.yaml](https://github.com/apache/druid/blob/master/licenses.yaml)
- [ ] added comments explaining the "why" and the intent of the code
wherever would not be obvious for an unfamiliar reader.
- [ ] added unit tests or modified existing tests to cover new code paths,
ensuring the threshold for [code
coverage](https://github.com/apache/druid/blob/master/dev/code-review/code-coverage.md)
is met.
- [ ] added integration tests.
- [ ] been tested in a test Druid cluster.
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