Luke Hutchison created FLINK-6108:
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Summary: Add sum(fieldName) to sum based on named POJO fields
Key: FLINK-6108
URL:
https://issues.apache.org/jira/browse/FLINK-6108 Project: Flink
Issue Type: Bug
Components: Core
Affects Versions: 1.2.0
Reporter: Luke Hutchison
Currently it is possible to do
{code}
dataSet.groupBy(0).sum(1)
{code}
but not
{code}
dataSet.groupBy("id").sum("count")
{code}
-- groupBy() takes named fields, but sum does not, it only works with tuples. It would be great if sum() could take named fields too -- otherwise you have to map to tuples to make use of easy summing.
(This would probably only work reliably with POJOs, since a new object instance would need to be constructed to take the field containing the sum.)
Similarly, min, max etc. should also take named fields.
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