kou commented on issue #40597:
URL: https://github.com/apache/arrow/issues/40597#issuecomment-2510488873

   BTW, we may not be able to the pre-computed record batch offsets approach. 
The streaming format may have "dictionary delta" messages: 
https://arrow.apache.org/docs/format/Columnar.html#dictionary-messages
   
   We may need to process data from begening to end to compute the correct 
dictionaries.


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