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Posted to dev@pig.apache.org by "Vivek Padmanabhan (JIRA)" <ji...@apache.org> on 2011/07/13 13:48:00 UTC
[jira] [Commented] (PIG-2159) New logical plan uses incorrect class
for SUM causing for ClassCastException
[ https://issues.apache.org/jira/browse/PIG-2159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13064498#comment-13064498 ]
Vivek Padmanabhan commented on PIG-2159:
----------------------------------------
The issue could be reproduced using the above mentioned script. A sample input is provided below ;
{code}
input1
100,101,102,103,104,105
110,111,112,113,114,115
input2
200,201,202,203,204,205
210,211,212,213,214,215
input0
100,101,102,103,104,105
200,201,202,203,204,205
{code}
The logical plan from explain for 0.9;
#-----------------------------------------------
# New Logical Plan:
#-----------------------------------------------
Final: (Name: LOStore Schema: total#95:double)
|
|---Final: (Name: LOForEach Schema: total#95:double)
| |
| (Name: LOGenerate[false] Schema:
total#95:double)ColumnPrune:InputUids=[91]ColumnPrune:OutputUids=[95]
| | |
| | (Name: UserFunc(org.apache.pig.builtin.DoubleSum) Type:
double Uid: 95)
The logical plan from explain for 0.8;
#-----------------------------------------------
# New Logical Plan:
#-----------------------------------------------
fake: (Name: LOStore Schema: total#68:long)
|
|---Final: (Name: LOForEach Schema: total#68:long)
| |
| (Name: LOGenerate[false] Schema:
total#68:long)ColumnPrune:InputUids=[66]ColumnPrune:OutputUids=[68]
| | |
| | (Name: UserFunc(org.apache.pig.builtin.LongSum) Type: long
Uid: 68)
| | |
| | |---(Name: Dereference Type: bag Uid: 67 Column:[3])
| | |
| | |---Porj:(Name: Project Type: bag Uid: 66 Input: 0
Column: (*))
| |
| |---Porj: (Name: LOInnerLoad[1] Schema:
f1#43:int,f2#44:int,f3#45:int,f4#59:long,f5#60:double)
> 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
> Fix For: 0.9.0
>
>
> 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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