zuston opened a new pull request, #2663:
URL: https://github.com/apache/uniffle/pull/2663
### What changes were proposed in this pull request?
- Add `dataTypeFlags` bitmask (2 bit per partition)
- If value <= 65535 → write as short (2 bytes)
- Else fallback to int (4 bytes) or long (8 bytes)
- Zstd compression for final stats
### Why are the changes needed?
To reduce the write stats size and reduce spark driver's memory footprint.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Unit tests
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