findepi commented on issue #11282:
URL: https://github.com/apache/datafusion/issues/11282#issuecomment-2211173292
Indeed, from SQL 2016 spec
```
<boolean test> ::=
<boolean primary> [ IS [ NOT ] <truth value> ]
<truth value> ::=
TRUE
| FALSE
| UNKNOWN
```
I didn't know about this syntax.
Thanks @alamb @jonahgao . So we don't want to unify. Just make sure the `IS
[NOT] ( TRUE | FALSE | UNKNOWN )` is applicable to booleans only.
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