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Related to #45081 StringIndexSort now properly handles collections with all-null string fields by: - Removing the error thrown when unique_count is 0 in ParseBinaryData - Adding alignment and padding support in mmap serialization (similar to ScalarIndexSort) - Separating data_size_ from mmap_size_ to correctly parse data without reading padding This fixes load collection timeout failures when all string field data is null, particularly affecting STL_SORT and TRIE index types. Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>