Since your join key is not in the Bag, can you do your join first and then execute your UDF?
On Fri, Sep 13, 2013 at 10:04 AM, John <[email protected]> wrote: > Okay, I think I have found the problem here: > http://pig.apache.org/docs/r0.11.1/perf.html#merge-joins ... there is > wirtten; > > There may be filter statements and foreach statements between the sorted > data source and the join statement. The foreach statement should meet the > following conditions: > > - There should be no UDFs in the foreach statement. > - The foreach statement should not change the position of the join keys. > - There should be no transformation on the join keys which will change > the sort order. > > > I have to use a UDF to transform the Map into a Bag ... any Workaround > idea? > > thanks > > > 2013/9/13 John <[email protected]> > > > Hi, > > > > I try to use a merge join for 2 bags. Here is my pig code: > > http://pastebin.com/Y9b2UtNk . > > > > But I got this error: > > > > Caused by: > > > org.apache.pig.backend.hadoop.executionengine.physicalLayer.LogicalToPhysicalTranslatorException: > > ERROR 1103: Merge join/Cogroup only supports Filter, Foreach, Ascending > > Sort, or Load as its predecessors. Found > > > > I think the reason is that there is no sort function or something like > > this. But the bags are definitely sorted. How can I do the merge join? > > > > thanks > > >
