asolimando opened a new pull request #2628:
URL: https://github.com/apache/calcite/pull/2628
Simplification (from `RexSimplify` class) is mostly covered in
`RexProgramTest`, a test for
expressions of the form `"IS NOT NULL(a) AND a=b" => "a=b"` under the
"UnknownAsFalse" semantics and not simplified under "UnknownAsUnknown" one,
seems uncovered.
Since I had to write a test to make sure the simplification was as expected,
I assume others might end up doing the same, and that the test will both act as
documentation and it will also protect against regressions.
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