Hi Dev Team, I developed a UDF to handle the following situation on pig 10.0 and want to see if I could contribute with it to the project.
Let us consider a BAG "A" with the following data: A:{record_id:{00001),names:{(ALAN),(SARAI)}},ids:{(00007),(00008)}} and an expected bag "B" B:{{record_id:(00001),name:(ALAN), id:(00007)},{record_id:(00001),name:(SARAI), id:(00008)}} Basically I propose a UDF "NLET" that takes N data bags containing the same M elements each of them and creates M tuples with N fields and that is used this way: B = FOREACH A GENERATE record_id, FLATTEN(NLET(names,ids)); I tried to handle the situation described above using JOIN and RANK to join the databags, and even though it is not optimal it dind't work, when using RANK for the join it generated runtime errors. B1 = FOREACH A GENERATE record_id, FLATTEN(names); B11 = RANK B1; B2 = FOREACH A GENERATE FLATTEN(ids); B22 = RANK B2; C = JOIN B11 BY rank_B1 LEFT OUTER,B22 by rank_B2; << Run time error I spend some time reading the reference manual information: http://pig.apache.org/docs/r0.8.1/piglatin_ref2.html http://pig.apache.org/docs/r0.11.0/basic.html and didn't identified a workaround to what I'm describing. I also read the UDF manual http://wiki.apache.org/pig/UDFManual to develop the function create the NLET UDF. This far the UDF does generate the expected result/tuples but doesn't add the schema information. If nobody has implemented this and it is worth to approve, I can spend time on adding the schema information and proper documentation. PS. I'm starting to get involved into the community and I will try to send emails before future development starts to avoid duplicated efforts. Best regards Alan del Rio