Github user amyrazz44 commented on the issue:
https://github.com/apache/incubator-hawq/pull/1108
We just port part of this pg bug fix for now which is fix out-of-range
characters part, about the cancel_requested part, we will port in the future.
Because postgres 9.6 adds some extra functions in regex code, e.g.
cancel_requested logic. And this pg bug fix includes cancel_requested code.
So, need more efforts to investigate whether we should add extra functions
to regex code in the other commit.
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