maytasm opened a new pull request, #16874:
URL: https://github.com/apache/druid/pull/16874
Fix Parquet Reader when ingestion need to read columns in filter
### Description
When columns are required in the filter (of the TransformSpec) but are not
specified in any of the metricSpec, dimensionSpec, transform (of the
TransformSpec), flattenSpec, timestampSpec, then it will not be read for
Parquet data files. Since the columns are not read, the filter will end up not
matching any rows. This fix makes sure that required columns for the filter are
read from the Parquet data files.
This PR has:
- [x] 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.
- [ ] a release note entry in the PR description.
- [ ] 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/dev/license.md)
- [ ] added comments explaining the "why" and the intent of the code
wherever would not be obvious for an unfamiliar reader.
- [x] 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.
- [x] been tested in a test Druid cluster.
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