optimizer pushes filter before the foreach that generates column used by filter
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Key: PIG-1022
URL: https://issues.apache.org/jira/browse/PIG-1022
Project: Pig
Issue Type: Bug
Components: impl
Reporter: Thejas M Nair
grunt> l = load 'students.txt' using PigStorage() as (name:chararray,
gender:chararray, age:chararray, score:chararray);
grunt> f = foreach l generate name, gender, age,score, '200' as gid:chararray;
grunt> g = group f by (name, gid);
grunt> f2 = foreach g generate group.name as name: chararray, group.gid as gid:
chararray;
grunt> filt = filter f2 by gid == '200';
grunt> explain filt;
In the plan generated filt is pushed up after the load and before the first
foreach, even though the filter is on gid which is generated in first foreach.
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