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issue: #43980 Fixes a panic that occurred when a partial update was converted to an insert due to a non-existent primary key. The panic was caused by missing nullable fields that were not provided in the original partial update request. The upsert pre-execution logic is refactored to handle this correctly: - Explicitly splits upsert data into 'insert' and 'update' batches. - Automatically generates data for missing nullable or default-value fields during inserts, preventing the panic. - Enhances `typeutil.UpdateFieldData` to support different source and destination indexes for flexible data merging. - Adds comprehensive unit tests for mixed upsert, pure insert, and pure update scenarios. --------- Signed-off-by: Wei Liu <wei.liu@zilliz.com>