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Expression simplification and "unknownAsFalse" mode


In https://issues.apache.org/jira/browse/CALCITE-2247 we're discussing
"unknownAsFalse". Please chime in.

On a related note, I want to draw your attention to
https://issues.apache.org/jira/browse/CALCITE-2314, which is a
powerful way to find bugs in our rules to rewrite scalar expressions.

Julian