Push up filter does not account for added columns in foreach
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Key: PIG-877
URL: https://issues.apache.org/jira/browse/PIG-877
Project: Pig
Issue Type: Bug
Affects Versions: 0.3.1
Reporter: Santhosh Srinivasan
Fix For: 0.3.1
If a filter follows a foreach that produces an added column then push up filter
fails with a null pointer exception.
{code}
...
x = foreach w generate $0, COUNT($1);
y = filter x by $1 > 10;
{code}
In the above example, the column in the filter's expression is an added column.
As a result, the optimizer rule is not able to map it back to the input
resulting in a null value. The subsequent for loop is failing due to NPE.
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