[ https://issues.apache.org/jira/browse/PIG-1434?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Aniket Mokashi updated PIG-1434: -------------------------------- Status: Open (was: Patch Available) > Allow casting relations to scalars > ---------------------------------- > > Key: PIG-1434 > URL: https://issues.apache.org/jira/browse/PIG-1434 > Project: Pig > Issue Type: Improvement > Reporter: Olga Natkovich > Assignee: Aniket Mokashi > Fix For: 0.8.0 > > Attachments: scalarImpl.patch, ScalarImpl1.patch, ScalarImpl5.patch, > ScalarImplFinale.patch, ScalarImplFinale1.patch, ScalarImplFinaleRebase.patch > > > This jira is to implement a simplified version of the functionality described > in https://issues.apache.org/jira/browse/PIG-801. > The proposal is to allow casting relations to scalar types in foreach. > Example: > A = load 'data' as (x, y, z); > B = group A all; > C = foreach B generate COUNT(A); > ..... > X = .... > Y = foreach X generate $1/(long) C; > Couple of additional comments: > (1) You can only cast relations including a single value or an error will be > reported > (2) Name resolution is needed since relation X might have field named C in > which case that field takes precedence. > (3) Y will look for C closest to it. > Implementation thoughts: > The idea is to store C into a file and then convert it into scalar via a UDF. > I believe we already have a UDF that Ben Reed contributed for this purpose. > Most of the work would be to update the logical plan to > (1) Store C > (2) convert the cast to the UDF -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.