jhorstmann commented on pull request #9038:
URL: https://github.com/apache/arrow/pull/9038#issuecomment-753311070
An alternative implementation would be to translate `x IN ('ABC', 'DEF',
'GHI')` into `(x = 'ABC') OR (x = 'DEF') OR (x = 'GHI')` on the logical plan
level. That should handle nulls correctly and for a short set of values it
should also have good performance since there are special comparison kernels
for comparing against literals. For a larger set of values the `contains` might
be more performant because of the possibility for returning early.
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