hcrosse commented on PR #1449:
URL: https://github.com/apache/arrow-go/pull/1449#issuecomment-6638255055

   @zeroshade Thanks. https://github.com/apache/arrow-go/pull/1457 fixes the 
`is_nan` panic by registering `is_nan`, `is_null` and `is_not_null` as plain 
`ScalarFunction`s instead of `compareFunction`s, so `is_nan` on a string or 
binary dictionary returns `arrow.ErrNotImplemented`. I added both cases to 
`TestDictionaryTypes` here. They panic until 
https://github.com/apache/arrow-go/pull/1457 merges, so this PR should merge 
after it.
   
   I left the `ExecuteScalarExpression` doc comment unchanged because I opened 
https://github.com/apache/arrow-go/pull/1461 to change that behavior. It makes 
`is_null` and `is_not_null` count a valid index pointing at a null dictionary 
value as null, matching Arrow C++.
   


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