Annotate explain plans with aliases
-----------------------------------
Key: PIG-1408
URL: https://issues.apache.org/jira/browse/PIG-1408
Project: Pig
Issue Type: Improvement
Affects Versions: 0.7.0
Reporter: Richard Ding
Assignee: Richard Ding
Fix For: 0.8.0
PIG-1156 added aliases in Pig scripts to the corresponding LogicalOperators and
PhysicalOperators. The aliases in the operators, however, are not displayed in
the output created by the explain command.
Since a Pig script can generate many MR jobs, it will be helpful, for debugging
purposes, to annotate the explain output plans with aliases, so that users can
correlate the jobs with the statements in their scripts.
Here is an example: given the following script
{code}
A = load 'input';
B = group A by $0;
C = foreach B generate group, flatten(A);
explain C
{code}
The output without alias annotation is
{code}
MapReduce node 1-28
Map Plan
Local Rearrange[tuple]{bytearray}(false) - 1-22
| |
| Project[bytearray][0] - 1-23
|
|---Load(file:///test/input:org.apache.pig.builtin.PigStorage) - 1-19--------
Reduce Plan
Store(fakefile:org.apache.pig.builtin.PigStorage) - 1-27
|
|---New For Each(false,true)[bag] - 1-26
| |
| Project[bytearray][0] - 1-24
| |
| Project[bag][1] - 1-25
|
|---Package[tuple]{bytearray} - 1-21--------
Global sort: false
{code}
While the output with alias annotation will be
{code}
MapReduce node 1-28
Map Plan
B: Local Rearrange[tuple]{bytearray}(false) - 1-22
| |
| Project[bytearray][0] - 1-23
|
|---A: Load(file:///test/input:org.apache.pig.builtin.PigStorage) - 1-19--------
Reduce Plan
C: Store(fakefile:org.apache.pig.builtin.PigStorage) - 1-27
|
|---C: New For Each(false,true)[bag] - 1-26
| |
| Project[bytearray][0] - 1-24
| |
| Project[bag][1] - 1-25
|
|---B: Package[tuple]{bytearray} - 1-21--------
Global sort: false
{code}
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