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https://issues.apache.org/jira/browse/PIG-627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12700925#action_12700925
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Pradeep Kamath commented on PIG-627:
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reviewed error_handling_0416.patch for additional changes per comment: 
https://issues.apache.org/jira/browse/PIG-627?focusedCommentId=12699990&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12699990.
 +1, committed after removing the javadoc related changes which were already 
committed in the previous commit.

> PERFORMANCE: multi-query optimization
> -------------------------------------
>
>                 Key: PIG-627
>                 URL: https://issues.apache.org/jira/browse/PIG-627
>             Project: Pig
>          Issue Type: Improvement
>    Affects Versions: 0.2.0
>            Reporter: Olga Natkovich
>         Attachments: doc-fix.patch, error_handling_0415.patch, 
> error_handling_0416.patch, file_cmds-0305.patch, fix_store_prob.patch, 
> merge-041409.patch, merge_741727_HEAD__0324.patch, 
> merge_741727_HEAD__0324_2.patch, merge_trunk_to_branch.patch, 
> multi-store-0303.patch, multi-store-0304.patch, multiquery-phase2_0313.patch, 
> multiquery-phase2_0323.patch, multiquery_0223.patch, multiquery_0224.patch, 
> multiquery_0306.patch, multiquery_explain_fix.patch, 
> non_reversible_store_load_dependencies.patch, 
> non_reversible_store_load_dependencies_2.patch, 
> noop_filter_absolute_path_flag.patch, 
> noop_filter_absolute_path_flag_0401.patch, streaming-fix.patch
>
>
> 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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