Jackie-Jiang opened a new pull request #7092:
URL: https://github.com/apache/incubator-pinot/pull/7092
## Description
Enhance `SegmentProcessorFramework` with the following improvements:
- Refactor reducer to:
- Support CONCAT/ROLLUP/DEDUP merge type (using off-heap memory)
- Support null values
- Generate generic row file as intermediate file
- Minimize the intermediate file generated (0 for CONCAT, 1 for
ROLLUP/DEDUP)
- Add `GenericRowFileRecordReader` which can directly read generic row file
for a range of records to avoid creating extra intermediate files when
generating segments
- Simplify the `MergeRollupTaskExecutor` to directly use the
`SegmentProcessorFramework`
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