alamb commented on issue #2873:
URL: 
https://github.com/apache/arrow-datafusion/issues/2873#issuecomment-1180690791

   The issue appear to be that the constant `''` is (correctly) cast to a 
`Dictionary(Int32, Utf8)` but then when converting it to a `ScalarValue` that 
optimization is lost.  I have a fix and I will file a ticket for a better fix


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