[format][python] Support additional MAP BLOB key types - #8963
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MAP<K, BLOB> schemas can use BOOLEAN, DECIMAL, and DATE keys, but the blob key serializers rejected them when data was written. Add matching Java and Python codecs, document their byte encodings, and cover cross-language round trips. Signed-off-by: QuakeWang <wangfuzheng0814@foxmail.com>
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Purpose
MAP<K, BLOB>schemas can useBOOLEAN,DECIMAL, andDATEkeys, but the existing blob key serializers rejected these types during writes.Add matching Java and Python key codecs, document their binary encodings, and keep Java/Python interoperability consistent.
Tests
BlobFileFormatTest