clintropolis opened a new pull request, #14412:
URL: https://github.com/apache/druid/pull/14412
Fixes #14339
### Description
changes:
* auto columns can now specialize the case when the column contains only
constants, avoiding writing any real columns and just producing constant
selectors and indexes. since this is backwards incompatible it is gated behind
a flag on IndexSpec, optimizeJsonConstantColumns, which should be removed in
Druid 28
* auto columns no longer participate in generic 'null column' handling, this
was a mistake to try to support and caused ingestion failures due to mismatched
ColumnFormat, and is replaced by the new constant column functionality
* fix bugs with auto columns which contain empty objects, empty arrays, or
primitive types mixed with either of these empty constructs
#### Release note
TBD
<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.
- [ ] 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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