existing column statistics can be missed
- Dominant language
- Java
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Description
MakeTypedColumnStats returns min/max statistics guided by column order:
if TYPE_DEFINED_ORDER - min_value/max_value, and min/max otherwise.
correct behavior should be based on __isset flag.
**Reporter**: [Renat Valiullin](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=rip.nsk@gmail.com) / @rip-nsk
#### PRs and other links:
- [GitHub Pull Request #36814](https://github.com/apache/arrow/pull/36814)
**Note**: *This issue was originally created as [PARQUET-2327](https://issues.apache.org/jira/browse/PARQUET-2327). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*
Contributor guide
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Research direction
Start with MakeTypedColumnStats and review GitHub Pull Request #36814, which is linked from the issue. Check how min/max statistics are selected and verify that the __isset flag, rather than column order, determines existing statistics; done means existing column statistics are not missed.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- java
- Domain
- data-engineering
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 25/100