clintropolis opened a new pull request #11895:
URL: https://github.com/apache/druid/pull/11895
### Description
#11713 changed the segment metadata query column analysis `type` field, but
this might not be very friendly to non Druid-schema users who are calling this
query directly because, merging query results of mixed versions of Druid would
result in an error due to mismatched types.
This PR reverts `type` to its original behavior, and adds a new
`typeSignature` which is used by `DruidSchema`. Error messaging when merging
`ColumnAnalysis` has also been improved to include the mismatched types
involved in the merge.
<hr>
##### Key changed/added classes in this PR
* `ColumnAnalysis`
* `SegmentAnalyzer`
<hr>
This PR has:
- [x] been self-reviewed.
- [x] added documentation for new or modified features or behaviors.
- [x] 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.
- [ ] been tested in a test Druid cluster.
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