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Review request for pig and Xuefu Zhang. Summary ------- The following script produce wrong result: a = load '1.txt' as (a0:bag{t:tuple(i0:int, i1:int)}); b = foreach a generate flatten(a0) as (b0, b1), flatten(a0) as (b2, b3); c = filter b by b0>b2; dump c; 1.txt: {(1,2),(2,3)} Expected result: (2,3,1,2) We get nothing. This addresses bug PIG-1785. https://issues.apache.org/jira/browse/PIG-1785 Diffs ----- http://svn.apache.org/repos/asf/pig/trunk/src/org/apache/pig/newplan/logical/rules/DuplicateForEachColumnRewrite.java 1055137 http://svn.apache.org/repos/asf/pig/trunk/src/org/apache/pig/newplan/logical/rules/ImplicitSplitInserter.java 1055137 http://svn.apache.org/repos/asf/pig/trunk/src/org/apache/pig/newplan/optimizer/PlanOptimizer.java 1055137 http://svn.apache.org/repos/asf/pig/trunk/src/org/apache/pig/newplan/optimizer/Rule.java 1055137 http://svn.apache.org/repos/asf/pig/trunk/test/org/apache/pig/test/TestEvalPipeline2.java 1055137 Diff: https://reviews.apache.org/r/269/diff Testing ------- Test-patch: [exec] -1 overall. [exec] [exec] +1 @author. The patch does not contain any @author tags. [exec] [exec] +1 tests included. The patch appears to include 3 new or modified tests. [exec] [exec] +1 javadoc. The javadoc tool did not generate any warning messages. [exec] [exec] +1 javac. The applied patch does not increase the total number of javac compiler warnings. [exec] [exec] +1 findbugs. The patch does not introduce any new Findbugs warnings. [exec] [exec] -1 release audit. The applied patch generated 478 release audit warnings (more than the trunk's current 476 warnings). No new files added. Ignore release audit warnings. Unit test: all pass End-to-end test: all pass Thanks, Daniel