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https://issues.apache.org/jira/browse/PIG-2159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13066082#comment-13066082
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Alan Gates commented on PIG-2159:
---------------------------------
Dmitry, I don't see this as a blocker for 0.9. It does not produce wrong
results and users can rewrite their scripts to work around it. I agree it
should go on the 0.9 branch and be part of the anticipated 0.9.1 release.
> New logical plan uses incorrect class for SUM causing for ClassCastException
> -----------------------------------------------------------------------------
>
> Key: PIG-2159
> URL: https://issues.apache.org/jira/browse/PIG-2159
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.9.0
> Reporter: Vivek Padmanabhan
> Priority: Blocker
> Fix For: 0.9.0
>
> Attachments: PIG-2159-1.patch, PIG-2159-2.patch
>
>
> The below is my script;
> {code}
> A = load 'input1' using PigStorage(',') as
> (f1:int,f2:int,f3:int,f4:long,f5:double);
> B = load 'input2' using PigStorage(',') as
> (f1:int,f2:int,f3:int,f4:long,f5:double);
> C = load 'input_Main' using PigStorage(',') as (f1:int,f2:int,f3:int);
> U = UNION ONSCHEMA A,B;
> J = join C by (f1,f2,f3) LEFT OUTER, U by (f1,f2,f3);
> Porj = foreach J generate C::f1 as f1 ,C::f2 as f2,C::f3 as f3,U::f4 as
> f4,U::f5 as f5;
> G = GROUP Porj by (f1,f2,f3,f5);
> Final = foreach G generate SUM(Porj.f4) as total;
> dump Final;
> {code}
> The script fails at while computing the sum with class cast exception.
> Caused by: java.lang.ClassCastException: java.lang.Long cannot be cast to
> java.lang.Double
> at org.apache.pig.builtin.DoubleSum$Initial.exec(DoubleSum.java:82)
> ... 19 more
> This is clearly a bug in the logical plan created in 0.9. The sum operation
> should have processed using org.apache.pig.builtin.LongSum, but instead 0.9
> logical plan have used org.apache.pig.builtin.DoubleSum which is meant for
> sum of doubles. And hence the ClassCastException.
> The same script works fine with Pig 0.8.
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