kou commented on issue #13396:
URL: https://github.com/apache/arrow/issues/13396#issuecomment-1162803044

   With https://github.com/apache/arrow/pull/13418, we can write it as:
   
   ```ruby
   s3_existing_table.merge(
     "History Completed Time" => s3_existing_table["History Completed 
Time"].cast({type: :timestamp, unit: :second}),
     "History Created Time" => s3_existing_table["History Created 
Time"].cast({type: :timestamp, unit: :second}),
   )
   ```


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