clintropolis opened a new pull request, #14186:
URL: https://github.com/apache/druid/pull/14186
### Description
This PR fixes an issue when using 'auto' encoded `LONG` typed columns and
the 'vectorized' query engine. These columns use a delta based bit-packing
mechanism, and errors in the vectorized reader would cause it to incorrectly
read column values for some bit sizes. This is a regression caused by #11004,
which added the optimized readers to improve performance.
While writing the test I finally got sad enough about `IndexSpec` not having
a "builder", so I made one, and switched all the things to use it. Apologies
for the noise in this bug fix PR, the only real changes are in
`VSizeLongSerde`, and the tests that have been modified to cover the buggy
behavior, `VSizeLongSerdeTest` and `ExpressionVectorSelectorsTest`. Everything
else is just cleanup of `IndexSpec` usage.
#### Release note
'auto' encoded `LONG` typed columns can read values incorrectly when using
the vectorized query engine. The data itself in the segment is fine, it is just
translated incorrectly for the vectorize query engine. If using 'auto' encoded
`LONG` columns we recommended to disable vectorization until upgrading to a
Druid version which contains this fix
<hr>
##### Key changed/added classes in this PR
* `VSizeLongSerde`
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.
- [ ] 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.
- [ ] 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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