Hadoop QA commented on PIG-920:
+1 overall. Here are the results of testing the latest attachment
against trunk revision 830335.
+1 @author. The patch does not contain any @author tags.
+1 tests included. The patch appears to include 6 new or modified tests.
+1 javadoc. The javadoc tool did not generate any warning messages.
+1 javac. The applied patch does not increase the total number of javac
+1 findbugs. The patch does not introduce any new Findbugs warnings.
+1 release audit. The applied patch does not increase the total number of
release audit warnings.
+1 core tests. The patch passed core unit tests.
+1 contrib tests. The patch passed contrib unit tests.
This message is automatically generated.
> optimizing diamond queries
> Key: PIG-920
> URL: https://issues.apache.org/jira/browse/PIG-920
> Project: Pig
> Issue Type: Improvement
> Reporter: Olga Natkovich
> Assignee: Richard Ding
> Attachments: PIG-920.patch
> The following query
> A = load 'foo';
> B = filer A by $0>1;
> C = filter A by $1 = 'foo';
> D = COGROUP C by $0, B by $0;
> does not get efficiently executed. Currently, it runs a map only job that
> basically reads and write the same data before doing the query processing.
> Query where the data is loaded twice actually executed more efficiently.
> This is not an uncommon query and we should fix this issue.
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