@Priyanka Projection is standard term from relational algebra https://en.wikipedia.org/wiki/Projection_(relational_algebra)
+1 for the name projection. ~ Yogi On 10 March 2016 at 11:01, Priyanka Gugale <[email protected]> wrote: > +1. > > This name is not self explanatory, I can't think of anything better as of > now. If someone have suggestions please add it here. I will also try to > find some options. > > -Priyanka > > On Thu, Mar 10, 2016 at 10:17 AM, Sandeep Deshmukh < > [email protected]> > wrote: > > > + 1 on projection w/o adding or updating fields. IMO, the purpose is to > > split the record into something that is useful and something that is not. > > > > Regards, > > Sandeep > > > > On Wed, Mar 9, 2016 at 9:08 PM, Chinmay Kolhatkar <[email protected]> > > wrote: > > > > > +1 for projection operator. > > > > > > @Sandesh, Adding of new fields and updating will be done as a part of > > > Enricher and Transform operator respectively. > > > I've sent another mail about Transform operator before. > > > > > > > > > On Wed, Mar 9, 2016 at 8:54 PM, Sandesh Hegde <[email protected] > > > > > wrote: > > > > > > > +1 > > > > > > > > Adding of new fields and updating of fields can be part of this? > > > > > > > > On Wed, Mar 9, 2016, 5:50 AM Pradeep A. Dalvi <[email protected]> > wrote: > > > > > > > > > Dear Folks, > > > > > > > > > > We are creating Projection Operator which will allow apex users to > > > > project > > > > > (select/drop) certain fields from the incoming tuples. This > operation > > > > might > > > > > be done unconditionally or based on certain condition. > > > > > > > > > > Use case: > > > > > ------------- > > > > > Not all fields of tuples are of interest for the downstream > > operators. > > > In > > > > > such cases, one may want project selective fields to downstream. > Also > > > one > > > > > may want to drop few fields, instead of selecting many. > > > > > In certain scenarios, one may want to project certain fields based > on > > > > given > > > > > condition or expression. > > > > > > > > > > Functionality: > > > > > ----------------- > > > > > 1. Projection operator shall receive POJO as input tuple and emit 2 > > > POJOs > > > > > on separate output ports i.e. selected and dropped. Selected output > > > port > > > > > shall emit POJO with selected fields and dropped output shall emit > > POJO > > > > of > > > > > dropped fields. > > > > > 2. Operator needs select or drop fields as input params. This shall > > be > > > > > specified using comma separated list of fields. > > > > > 3. Operator shall emit POJO only on connected output ports. In > > another > > > > > words, if dropped output port is not connected, it shall not even > try > > > to > > > > > generate POJOs with dropped fields. > > > > > > > > > > Please feel free to let me know your thoughts on this. > > > > > > > > > > Thanks, > > > > > Pradeep A. Dalvi > > > > > > > > > > > > > > >
