PruneColumns optimization does not handle the case of foreach flatten correctly
if flattened bag is not used later
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Key: PIG-1184
URL: https://issues.apache.org/jira/browse/PIG-1184
Project: Pig
Issue Type: Bug
Affects Versions: 0.6.0
Reporter: Pradeep Kamath
The following script :
{noformat}
-e "a = load 'input.txt' as (f1:chararray, f2:chararray,
f3:bag{t:tuple(id:chararray)}, f4:bag{t:tuple(loc:chararray)}); b = foreach a
generate f1, f2, flatten(f3), flatten(f4), 10; b = foreach b generate f1, f2,
\$4; dump b;"
{noformat}
gives the following result:
(oiue,M,10)
{noformat}
cat input.txt:
oiue M {(3),(4)} {(toronto),(montreal)}
{noformat}
If PruneColumns optimizations is disabled, we get the right result:
(oiue,M,10)
(oiue,M,10)
(oiue,M,10)
(oiue,M,10)
The flatten results in 4 records - so the output should contain 4 records.
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