wei liu 5ef793c393
fix: Fix panic when upsert with partial_update=true on empty table (#44155)
issue: #43980
Fix panic issue caused by incorrect nullable field merging logic when
upsert converts to insert operation on empty tables.

- Add AppendFieldDataWithNullData to handle nullable field merging
- Fix existing data merge with skipAppendNullData=false
- Fix insert data merge with skipAppendNullData=true
- Add unit tests for nullable field data appending scenarios

Signed-off-by: Wei Liu <wei.liu@zilliz.com>
2025-09-02 16:47:52 +08:00
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