[format][python] Support binary keys for MAP BLOB - #9057
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MAP<K, BLOB> rejects BINARY and VARBINARY keys, and Java byte[] keys use identity equality instead of map key content semantics. Add matching Java and Python codecs, normalize binary keys by content across map copies and primary-key blob externalization, and cover format and cross-language round trips. Signed-off-by: QuakeWang <wangfuzheng0814@foxmail.com>
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Purpose
MAP<K, BLOB>rejectsBINARYandVARBINARYkeys. In Java,byte[]map keys also use identity equality, so equal key bytes can survive as duplicate entries and overridden BLOB payloads can still be externalized.Add Java and Python binary key codecs, normalize Java binary keys by content across map reads, copies, and primary-key externalization, and document the byte encoding.
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