Github user mehant commented on the pull request:
https://github.com/apache/drill/pull/213#issuecomment-151273785
+1.
On a side note, I remember there was some discussion earlier about having
an explicit nullable vector or not, in this particular case it might be better
to have an explicit nullable vector and let the implicit cast logic handle
going between a null type and others, instead of the operator having to deal
with this.
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