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  1. Calcite
  2. CALCITE-3049

When simplifying expressions, revisit "IS NULL" if its argument has been simplified

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      When simplifying expressions, revisit "IS NULL" if its argument has been simplified. For example, we currently simplify

      (CASE WHEN FALSE THEN +(v0) ELSE -1 END) IS UNKNOWN

      to

      -1 IS UNKNOWN

      but we should further simplify that to FALSE.

      I have a preliminary dev branch, but it needs a little more debugging. I'd be grateful if someone could finish it.

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              danny0405 Danny Chen
              julianhyde Julian Hyde
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