lgbo-ustc opened a new pull request, #12173:
URL: https://github.com/apache/gluten/pull/12173
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## What changes are proposed in this pull request?
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RowNumGroupArraySorted writes aggregate results into a newly created
ColumnArray. For the first output row the array offsets vector can be empty,
but insertResultInto read result_array_offsets.back() before appending the
first offset. That is undefined behavior and can crash when aggregate top-k
writes its first result.
Treat an empty offsets vector as having previous offset 0 before appending
the next cumulative offset. Add a ClickHouse backend regression test that
forces row_number top-k through the aggregate group limit path and validates
the first array result row against vanilla Spark.
closed #12172
## How was this patch tested?
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co-authored using generative AI tooling
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