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https://issues.apache.org/jira/browse/PIG-723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12683098#action_12683098
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Santhosh Srinivasan commented on PIG-723:
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This is a duplicate of PIG-694.
> Pig generates incorrect schema for generated bags after FOREACH.
> ----------------------------------------------------------------
>
> Key: PIG-723
> URL: https://issues.apache.org/jira/browse/PIG-723
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.1.0
> Environment: Linux
> $pig --version
> Apache Pig version 0.1.0-dev (r750430)
> compiled Mar 07 2009, 09:20:13
> Reporter: Dhruv M
> Priority: Critical
>
> grunt> rf_src = LOAD 'rf_test.txt' USING PigStorage(',') AS (lhs:chararray,
> rhs:chararray, r:float, p:float, c:float);
> grunt> rf_grouped = GROUP rf_src BY rhs;
>
> grunt> lhs_grouped = FOREACH rf_grouped GENERATE group as rhs, rf_src.(lhs,
> r) as lhs, MAX(rf_src.p) as p, MAX(rf_src.c) AS c;
> grunt> describe lhs_grouped;
> lhs_grouped: {rhs: chararray,lhs: {lhs: chararray,r: float},p: float,c: float}
> I think it should be:
> lhs_grouped: {rhs: chararray,lhs: {(lhs: chararray,r: float)},p: float,c:
> float}
> Because of this, we are not able to perform UNION on 2 sets because union on
> incompatible schemas is causing a complete loss of schema information, making
> further processing impossible.
> This is what we want to UNION with:
> grunt> asrc = LOAD 'atest.txt' USING PigStorage(',') AS (rhs:chararray,
> a:int);
> grunt> aa = FOREACH asrc GENERATE rhs, (bag{tuple(chararray,float)}) null as
> lhs, -10F as p, -10F as c;
> grunt> describe aa;
> aa: {rhs: chararray,lhs: {(chararray,float)},p: float,c: float}
> If there is something wrong with what I am trying to do, please let me know.
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