Ah, sorry, you are right. You could also call keyBy again before the second sum, but maybe someone else has a better idea.
Best, Gábor 2016-06-07 16:18 GMT+02:00 Al-Isawi Rami <rami.al-is...@comptel.com>: > Thanks Gábor, but the first sum call will return > > SingleOutputStreamOperator > > I could not do another sum call on that. Would tell me how did you manage to > do > > stream.sum().sum() > > Regards, > -Rami > > On 7 Jun 2016, at 16:13, Gábor Gévay <gga...@gmail.com> wrote: > > Hello, > > In the case of "sum", you can just specify them one after the other, like: > > stream.sum(1).sum(2) > > This works, because summing the two fields are independent. However, > in the case of "keyBy", the information is needed from both fields at > the same time to produce the key. > > Best, > Gábor > > > > 2016-06-07 14:41 GMT+02:00 Al-Isawi Rami <rami.al-is...@comptel.com>: > > Hi, > > Is there any reason why “keyBy" accepts multi-field, while for example “sum” > does not. > > -Rami > Disclaimer: This message and any attachments thereto are intended solely for > the addressed recipient(s) and may contain confidential information. If you > are not the intended recipient, please notify the sender by reply e-mail and > delete the e-mail (including any attachments thereto) without producing, > distributing or retaining any copies thereof. Any review, dissemination or > other use of, or taking of any action in reliance upon, this information by > persons or entities other than the intended recipient(s) is prohibited. > Thank you. > > > Disclaimer: This message and any attachments thereto are intended solely for > the addressed recipient(s) and may contain confidential information. If you > are not the intended recipient, please notify the sender by reply e-mail and > delete the e-mail (including any attachments thereto) without producing, > distributing or retaining any copies thereof. Any review, dissemination or > other use of, or taking of any action in reliance upon, this information by > persons or entities other than the intended recipient(s) is prohibited. > Thank you.
