aiguofer commented on issue #38785:
URL: https://github.com/apache/arrow/issues/38785#issuecomment-1819673325

   One thing I noticed while working on this code is that the way we're 
identifying `UPDATE` statements is REALLY naive. If the server returns a `null` 
schema for the `createPreparedStatement` call, the driver thinks this is an 
`UPDATE` call.  This could be your problem. Is the server correctly setting the 
schema?


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