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
Priority: Critical
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.$2));
Notice that Distinct udf is missing in Combiner and reduce stage. As a result
distinct does not function, and incorrect results are produced.
Distinct should have been evaluated in the 3 stages and output of Distinct
should be given to COUNT in reduce stage.
# Map Reduce Plan
#--------------------------------------------------
MapReduce node 1-122
Map Plan
Local Rearrange[tuple]{bytearray}(false) - 1-139
| |
| Project[bytearray][1] - 1-140
|
|---New For Each(false,false)[bag] - 1-127
| |
| POUserFunc(org.apache.pig.builtin.COUNT$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
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