Github user sirpkt commented on the pull request:
https://github.com/apache/tajo/pull/315#issuecomment-68024356
I updated the patch as followings
- null handling bug fix in getPartialResult() of Min and Max
- getEmptyTuple() in DistinctGroupbySortAggregationExec.java is changed to
make Tuple according to the type of aggregation functions: currently, null
datum for min and max and 0 for other types.
- Test result is fixed as correct value
mvn clean install passed.
sum() and avg() also need to be changed to handle null differently from
non-null values.
I'll make another issue about sum() and avg().
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