[
https://issues.apache.org/jira/browse/PIG-834?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ashutosh Chauhan updated PIG-834:
---------------------------------
Status: Open (was: Patch Available)
> incorrect plan when algebraic functions are nested
> --------------------------------------------------
>
> Key: PIG-834
> URL: https://issues.apache.org/jira/browse/PIG-834
> Project: Pig
> Issue Type: Bug
> Components: impl
> Reporter: Thejas M Nair
> Assignee: Ashutosh Chauhan
> Fix For: 0.7.0
>
> Attachments: pig-834.patch, pig-834_2.patch
>
>
> a = load 'students.txt' as (c1,c2,c3,c4);
> c = group a by c2;
> f = foreach c generate COUNT(org.apache.pig.builtin.Distinct($1.$2));
> Notice that Distinct udf is missing in Combiner and reduce stage. As a result
> distinct does not function, and incorrect results are produced.
> Distinct should have been evaluated in the 3 stages and output of Distinct
> should be given to COUNT in reduce stage.
> {code}
> # Map Reduce Plan
> #--------------------------------------------------
> MapReduce node 1-122
> Map Plan
> Local Rearrange[tuple]{bytearray}(false) - 1-139
> | |
> | Project[bytearray][1] - 1-140
> |
> |---New For Each(false,false)[bag] - 1-127
> | |
> | POUserFunc(org.apache.pig.builtin.COUNT$Initial)[tuple] - 1-125
> | |
> | |---POUserFunc(org.apache.pig.builtin.Distinct)[bag] - 1-126
> | |
> | |---Project[bag][2] - 1-123
> | |
> | |---Project[bag][1] - 1-124
> | |
> | Project[bytearray][0] - 1-133
> |
> |---Pre Combiner Local Rearrange[tuple]{Unknown} - 1-141
> |
>
> |---Load(hdfs://wilbur11.labs.corp.sp1.yahoo.com/user/tejas/students.txt:org.apache.pig.builtin.PigStorage)
> - 1-111--------
> Combine Plan
> Local Rearrange[tuple]{bytearray}(false) - 1-143
> | |
> | Project[bytearray][1] - 1-144
> |
> |---New For Each(false,false)[bag] - 1-132
> | |
> | POUserFunc(org.apache.pig.builtin.COUNT$Intermediate)[tuple] - 1-130
> | |
> | |---Project[bag][0] - 1-135
> | |
> | Project[bytearray][1] - 1-134
> |
> |---POCombinerPackage[tuple]{bytearray} - 1-137--------
> Reduce Plan
> Store(fakefile:org.apache.pig.builtin.PigStorage) - 1-121
> |
> |---New For Each(false)[bag] - 1-120
> | |
> | POUserFunc(org.apache.pig.builtin.COUNT$Final)[long] - 1-119
> | |
> | |---Project[bag][0] - 1-136
> |
> |---POCombinerPackage[tuple]{bytearray} - 1-145--------
> Global sort: false
> {code}
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
