[jira] [Created] (BEAM-524) Description of "type" argument in Aggregator is incorrect

["Frank Yellin (JIRA)" <ji...@apache.org>]

Frank Yellin created BEAM-524:
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             Summary: Description of "type" argument in Aggregator is incorrect
                 Key: BEAM-524
                 URL: https://issues.apache.org/jira/browse/BEAM-524
             Project: Beam
          Issue Type: Bug
            Reporter: Frank Yellin
            Priority: Minor


Two problems with documentation for "type" argument.

Trivial:  Remove "by default".  This phrase implies that there are other alternatives besides what is listed.  There aren't.

Non trivial.  The documentation says "types appropriate to the combine_fn" are accepted.  I tried 
        Accumulator("foo", max, datetime.datetime)
This failed even though "datetime.datetime" is a perfectly reasonable type to want to take the max of.  (I wanted to know precisely when the last job finished.)

Either the documentation needs to be changed to specify that max/min only apply to numeric types, or the code needs to be changed to allow other uses of min and max.




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