medart created MADLIB-1016:
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             Summary: k-mean & decision Tree don't work because of array_agg in 
order by clause
                 Key: MADLIB-1016
                 URL: https://issues.apache.org/jira/browse/MADLIB-1016
             Project: Apache MADlib
          Issue Type: Bug
          Components: Module: Array Ops
            Reporter: medart


When we try to use k-mean function or decision tree the same error appear.

ERROR:  plpy.SPIError: ORDER BY specified, but array_agg is not an ordered 
aggregate function (plpython.c:4648)

For information we use Madlib 1.9.1 with Pivotal Greenplum, and we use the 
example data as shown in the official documentatio.

The regression work great nad we didint try all the algorithme yet, to see if 
the problem apprear in the other methods.


Thank you for your help



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