Github user snaga commented on the issue:
https://github.com/apache/incubator-madlib/pull/57
@iyerr3 I think the code of madlib.array_agg() function is shared among
PostgreSQL and GPDB. PostgreSQL (9.3~9.6) can work without this function, but
GPDB still needs this function. Thus, it needs to be kept in this source for
GPDB, doesn't it?
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