clintropolis opened a new pull request, #14456:
URL: https://github.com/apache/druid/pull/14456
### Description
This PR consolidates 'json' and 'auto' column indexers, bring all the
improvements of 'auto' to 'json'. 'auto' is the next generation (v5) of 'json'
(v4) nested column format. However, 'json' was kept separate and on the
previous version of the format for backwards compatibility during rolling
upgrades from 25 to 26. Basically this allows us to dump a bunch of code,
leaving only the v4 reader so that we can continue to read the older columns.
I will open a separate PR to handle future backwards compatibility concerns
in order to degrade gracefully when new column format features are added to
make what we had to do here less important.
#### Release note
'json' is now equivalent to using 'auto' in native ingestion dimension
specs, upgrading 'json' to get all of the features and functionality of 'auto',
such as type specializations including ARRAY typed columns, better support for
nested arrays and smarter index utilization. However, this means that 'json'
columns created with Druid 27 are not backwards compatible with Druid versions
older than 26, so it is recommended to upgrade to Druid 26 prior to upgrading
to Druid 27 if upgrading from an older version and using 'json' columns.
<hr>
<!-- Check the items by putting "x" in the brackets for the done things. Not
all of these items apply to every PR. Remove the items which are not done or
not relevant to the PR. None of the items from the checklist below are strictly
necessary, but it would be very helpful if you at least self-review the PR. -->
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.
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
