Signature of loader does not set correctly for order by
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Key: PIG-1165
URL: https://issues.apache.org/jira/browse/PIG-1165
Project: Pig
Issue Type: Bug
Components: impl
Affects Versions: 0.6.0
Reporter: Daniel Dai
Assignee: Daniel Dai
Fix For: 0.6.0
In pig, we need to set signature for each LoadFunc. Currently, we use alias of
the LOAD statement in Pig script of the signature of the LoadFunc. One use case
we have is in LoadFunc, we use signature to retrieve pruned columns of each
specific loader. However, in "order by" statement, we do not set signature for
the loader correctly. In this case, we do not prune the loader correctly.
For example, the following script produce wrong result:
{code}
a = load '1.txt' as (a0, a1);
b = order a by a1;
c = order b by a1;
d = foreach c generate a1;
dump d;
{code}
1.txt:
{code}
1 a
2 b
3 c
6 d
5 e
{code}
expected result:
a
b
c
d
e
current result:
1
2
3
5
6
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