huymq1710 commented on issue #17152:
URL: https://github.com/apache/datafusion/issues/17152#issuecomment-4349483289

   Hi @alamb,
   
   https://github.com/apache/datafusion/pull/20635 resolved 
`Vec<Option<String>>` extra allocations
   I created https://github.com/apache/datafusion/pull/21948 to resolve per-row 
cast on fallback


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