On this page: http://bugs.mysql.com/bug.php?id=27645
There is a sentence:
All these database servers allow this, so what's the hangup?!
what's the hangup mean?
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A "hangup" in this context (doesn't refer to someone hanging-up the phone on you), but rather, has the meaning of : (By Dictionary.com)
Your example in view of the definition above, is asking what the problem is, seeing that all databases allow "PostgreSQL,MSSQL, Oracle", what's stopping everyone from doing something (I'm not quite sure what the something, but it's got to do with adding a new option or something similar) in the past one year.
Perhaps, it could have the alternative meaning of "Psychological block", that is, someone's having problem accepting doing that "something" :
This could also apply to your context, in that, the commentor is saying, as all databases allow "PostgreSQL,MSSQL, Oracle", what's the problem(in a psychological sense this time), that's stopping everyone for the past year from doing that "something?"