jackylee-ch opened a new pull request, #9280:
URL: https://github.com/apache/paimon/pull/9280
### Purpose
`RangeBitmapFileIndex#visitTopN` sets `strict = orders.size() == 1`: with
more orders the
index only prunes, so rows tied on the first key must survive for the engine
to break the
tie. #6178 threaded `strict` into `BitSliceIndexBitmap` but not into
`fillNulls`, so a tied
null group is still trimmed. Value ties already keep the group.
`ORDER BY col1 ASC NULLS FIRST, col2 DESC LIMIT 2`, `col1 =
[null,null,null,7,8]`:
```
was {0,1} -> engine can only answer rows 1,0
now {0,1,2} -> rows 2,1, correct
```
### Tests
`RangeBitmapFileIndexTest#testTopNWithMultipleColumnsKeepsNullTies`, also
pinning that a
single order still trims.
Written with Claude Code; reasoning and verification are mine.
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