Github user ArvindSridhar commented on the issue:
https://github.com/apache/madlib/pull/291
Regarding bool to text/integer conversion in GPDB5, I believe you have to
use an explicit cast as required by the underlying platform. Thus, if you
"temperature, windy::integer" or "windy::text, class", it should work fine.
This is how the underlying postgres syntax for GPDB5 works as well
For the text-varchar ordering, my hunch is that postgres treats these types
as having the same priority, and thus just casts the second argument to
whatever type the first argument was in.
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