kz930 opened a new issue, #8702:
URL: https://github.com/apache/texera/issues/8702

   ### Task Summary
   
   The JSON Lines and Arrow sources implement `StandaloneCodeGenerator`. Arrow 
is read into pandas' nullable dtypes, since the file states of every value 
whether it is there. JSONL states nothing, so each column is typed the way the 
engine types it, and a timestamp is read the way the engine reads one.
   
   Matching Arrow also changes the engine. A TIMESTAMP reaches a Python worker 
as a zoneless microsecond Arrow timestamp instead of a millisecond one labelled 
UTC. That is what the Python side already declares, and what a script holds.
   
   Step 12b in #8325. It needs #8341 for the shared source code and #8597 for 
the timestamp helpers.
   


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