PERFORMANCE: multi-query optimization
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Key: PIG-627
URL: https://issues.apache.org/jira/browse/PIG-627
Project: Pig
Issue Type: Improvement
Affects Versions: types_branch
Reporter: Olga Natkovich
Fix For: types_branch
Currently, if your Pig script contains multiple stores and some shared
computation, Pig will execute several independent queries. For instance:
A = load 'data' as (a, b, c);
B = filter A by a > 5;
store B into 'output1';
C = group B by b;
store C into 'output2';
This script will result in map-only job that generated output1 followed by a
map-reduce job that generated output2. As the resuld data is read, parsed and
filetered twice which is unnecessary and costly.
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