Alex Behm has posted comments on this change.

Change subject: IMPALA-1767 Adds predicate to test boolean values true, false, 
unknown.
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Patch Set 8:

Our other approach for these small rewrites can be seen in 
FunctionCallExpr#createExpr(). Basically we transform directly in the parser. 
An example of that approach is NVL2().

I still think it makes sense to unify with IsNUllPredicate in the grand scheme 
of things.

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Gerrit-MessageType: comment
Gerrit-Change-Id: I5bd0aa82a0316ac236b7ecf8612ef4b30c016a00
Gerrit-PatchSet: 8
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Vuk Ercegovac <[email protected]>
Gerrit-Reviewer: Alex Behm <[email protected]>
Gerrit-Reviewer: Dimitris Tsirogiannis <[email protected]>
Gerrit-Reviewer: Philip Zeyliger <[email protected]>
Gerrit-Reviewer: Thomas Tauber-Marshall <[email protected]>
Gerrit-Reviewer: Vuk Ercegovac <[email protected]>
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