WindowedStream sum behavior

[Elias Levy]

I am wondering about the expected behavior of the sum method.  Obviously it sums a specific field in a tuple or POJO. But what should one expect in other fields?  Does sum keep the first field, last field or there aren't any guarantees?

[Aljoscha Krettek]

Hi,

there no guarantees for the fields other than the summed field (and eventual key fields). I think in practice it's either the fields from the first or last record but I wouldn't rely on that.

Cheers,

Aljoscha

On Sat, 9 Apr 2016 at 03:19 Elias Levy <[hidden email]> wrote:

I am wondering about the expected behavior of the sum method.  Obviously it sums a specific field in a tuple or POJO. But what should one expect in other fields?  Does sum keep the first field, last field or there aren't any guarantees?