Improve dictionary filter evaluating notEq
- Dominant language
- Java
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Description
When evaluating `notEq`, if the column may contain nulls and the `notEq` value is non-null, the row-group must not be skipped. In such scenario reading dictionary and compare values is not necessary.
**Reporter**: [Yujiang Zhong](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=zhongyuj) / @zhongyujiang
**Note**: *This issue was originally created as [PARQUET-2245](https://issues.apache.org/jira/browse/PARQUET-2245). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*
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Research direction
The issue names no source file, test, or entry point. Start by locating the dictionary filter implementation and its tests, then reproduce the notEq case where the column may contain nulls and confirm that the row group is not skipped without unnecessary dictionary comparison.
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
- 35/100