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18371773dd
issue: #43980 This commit optimizes the partial update merge logic by standardizing nullable field representation before merge operations to avoid corner cases during the merge process. Key changes: - Unify nullable field data format to FULL FORMAT before merge execution - Add extensive unit tests for bounds checking and edge cases The optimization ensures: - Consistent nullable field representation across SDK and internal - Proper handling of null values during merge operations - Prevention of index out-of-bounds errors in vector field updates - Better error handling and validation for partial update scenarios This resolves issues where different nullable field formats could cause merge failures or data corruption during partial update operations. Signed-off-by: Wei Liu <wei.liu@zilliz.com>