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https://issues.apache.org/jira/browse/PIG-2422?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vivek Padmanabhan updated PIG-2422:
-----------------------------------
Attachment: PIG-2422_1.patch
Attaching an initial patch containing log statements.
> Add log messages for Jython schema definitions
> ----------------------------------------------
>
> Key: PIG-2422
> URL: https://issues.apache.org/jira/browse/PIG-2422
> Project: Pig
> Issue Type: Improvement
> Affects Versions: 0.9.1, 0.10
> Reporter: Vivek Padmanabhan
> Assignee: Vivek Padmanabhan
> Priority: Minor
> Fix For: 0.9.1
>
> Attachments: PIG-2422_1.patch
>
>
> In many cases, we have seen users debugging a lot of time for simple schema
> definition mistakes in jython udfs.
> I believe adding some log messages could help users in this case.
> For Ex, the below script results in exception (field row doesnt exist) in
> line P since the schema definition is not annotated properly (@ is missing).
> Also There are no error messages from the python.
> register 'schemabug.py' using jython as schemabug;
> A = load 'schemabugA.txt' using PigStorage() as ( x : chararray,y :
> chararray, z : long );
> M = group A by (x, y);
> N = foreach M generate schemabug.numberrows(A) as udfout;
> O = foreach N generate FLATTEN(udfout);
> P = foreach O generate row.x;
> dump P;
> schemabug.py
> ------------
> outputSchema("numberrows:bag{rownum:tuple(row:tuple(x:chararray,y:chararray,z:long),number:long)}")
> def numberrows(inBag):
> outBag = []
> number = 0
> for row in inBag:
> number = number + 1
> tup = (row, number)
> outBag.append(tup)
> return outBag
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