[format][python] Reject duplicate MAP BLOB keys - #9107
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MAP<K, BLOB> writers accepted duplicate keys from Python key-value pairs and Java binary-key maps, while readers silently kept the last entry. This violates map uniqueness and can persist discarded BLOB payloads. Validate serialized keys before writing and reject duplicate keys while reading in Java and Python. Cover writer rejection, malformed payloads, and table round trips. Signed-off-by: QuakeWang <wangfuzheng0814@foxmail.com>
Signed-off-by: QuakeWang <wangfuzheng0814@foxmail.com>
Signed-off-by: QuakeWang <wangfuzheng0814@foxmail.com>
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Purpose
MAP<K, BLOB>writers accepted duplicate keys from Python key-value pairs and Java binary-key maps, while readers silently kept the last value. This violated map uniqueness and could persist discarded BLOB payloads.Validate serialized keys before writing and reject duplicate-key payloads when reading in Java and Python.
Tests