viirya commented on PR #2787:
URL:
https://github.com/apache/arrow-datafusion/pull/2787#issuecomment-1165858978
The failed cases looks not like an attempt to really want to cast other
datatype (Utf8) to Null. Looks like an incorrect type coercion rule for `NULL
IN ('a','b')`. It tries to cast from utf8 to null, but seems it is more correct
to cast from null to utf8.
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