That's also Ok. On Mon, Jul 11, 2011 at 5:47 AM, Zhijie Shen (JIRA) <j...@apache.org> wrote:
> > [ > https://issues.apache.org/jira/browse/PIG-1916?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13063313#comment-13063313] > > Zhijie Shen commented on PIG-1916: > ---------------------------------- > > Hi Daniel, > > Yes, I'm currently preparing the test cases. However, instead of writing a > separate test suit, may I added the cases into TestForEachNestedPlanLocal > and TestForEachNestedPlan, which already contains the cases for other nested > operators. > > > Nested cross > > ------------ > > > > Key: PIG-1916 > > URL: https://issues.apache.org/jira/browse/PIG-1916 > > Project: Pig > > Issue Type: New Feature > > Components: impl > > Reporter: Daniel Dai > > Assignee: Zhijie Shen > > Labels: gsoc2011 > > Fix For: 0.10 > > > > Attachments: PIG-1916_1.patch, PIG-1916_2.patch, PIG-1916_3.patch > > > > > > It is useful to have cross inside foreach nested statement. One typical > use case for nested foreach is after cogroup two relations, we want to > flatten the records of the same key, and do some processing. This is > naturally to be achieved by cross. Eg: > > {code} > > C = cogroup user by uid, session by uid; > > D = foreach C { > > crossed = cross user, session; -- To flatten two input bags > > filtered = filter crossed by user::region == session::region; > > result = foreach crossed generate processSession(user::age, > user::gender, session::ip); --Nested foreach Jira: PIG-1631 > > generate result; > > } > > {code} > > If we don't have cross, user have to write a UDF process the bag user, > session. It is much harder than a UDF process flattened tuples. This is > especially true when we have nested foreach statement(PIG-1631). > > This is a candidate project for Google summer of code 2011. More > information about the program can be found at > http://wiki.apache.org/pig/GSoc2011 > > -- > This message is automatically generated by JIRA. > For more information on JIRA, see: http://www.atlassian.com/software/jira > > >
