feat: support for IS UNKNOWN
/ IS NOT UNKNOWN
#161
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I have been reviewing this library's support for unary operators, and I noticed that
IS UNKNOWN
andIS NOT UNKNOWN
were not supported, so I have added support for them, along with tests.Additionally, it was not immediately clear to me if
ISNULL
andNOTNULL
were supported, so I added tests for them. I see from the tests that these are mapped toIS NULL
andIS NOT NULL
.