WinkerDu commented on PR #2144:
URL:
https://github.com/apache/arrow-datafusion/pull/2144#issuecomment-1093085616
> I wonder if it would be helpful to add a test in
`datafusion/core/tests/sql` somewhere to show a query like `SELECT null,
not(null)` working?
@alamb OK, will add more tests:
1. `SELECT not(true), not(false)` = `false, true`
2. `SELECT null, not(null)` = `NULL, NULL`
3. `SELECT NOT('hi')`, type check error would raise.
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