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issue: #44909 When requery optimization is enabled, search results contain IDs but empty FieldsData. During reduce/rerank operations, if the first shard has empty FieldsData while others have data, PrepareResultFieldData initializes an empty array, causing AppendFieldData to panic when accessing array indices. Changes: - Find first non-empty FieldsData as template in 3 functions: reduceAdvanceGroupBy, reduceSearchResultDataWithGroupBy, reduceSearchResultDataNoGroupBy - Add length check before 2 AppendFieldData calls in reduce functions to prevent panic - Improve newRerankOutputs to find first non-empty fieldData using len(FieldsData) check instead of GetSizeOfIDs - Add length check in appendResult before AppendFieldData - Add comprehensive unit tests for empty and partial empty FieldsData scenarios in both reduce and rerank functions This fix handles both pure requery (all empty) and mixed scenarios (some empty, some with data) without breaking normal search flow. The key improvement is checking FieldsData length directly rather than IDs, as requery may have IDs but empty FieldsData. Signed-off-by: Wei Liu <wei.liu@zilliz.com>