[jira] [Created] (CALCITE-1953) Reducing NOT() should not collaose NOT(IS_TRUE) to IS_FALSE for nullable inputs

["MinJi Kim (JIRA)" <ji...@apache.org>]

MinJi Kim created CALCITE-1953:
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             Summary: Reducing NOT() should not collaose NOT(IS_TRUE) to IS_FALSE for nullable inputs
                 Key: CALCITE-1953
                 URL: https://issues.apache.org/jira/browse/CALCITE-1953
             Project: Calcite
          Issue Type: Bug
            Reporter: MinJi Kim
            Assignee: Julian Hyde


In RexSimplify, when simplifying NOT(), we negate the input expression.  But for IS_FALSE/IS_TRUE/IS_NOT_FALSE/IS_NOT_TRUE this cannot be just negated if the input is nullable.

{code}
IS_FALSE(null) = false
IS_TRUE(null) = false
NOT(IS_FALSE(null)) = true != IS_TRUE(null)

IS_NOT_FALSE(null) = true
IS_NOT_TRUE(null) = true
NOT(IS_NOT_FALSE(null)) = false != IS_NOT_TRUE(null)
{code}



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