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From "Mohit Sabharwal (JIRA)" <>
Subject [jira] [Created] (HIVE-9181) Fix SkewJoinOptimizer related Java 8 ordering differences
Date Sat, 20 Dec 2014 02:13:15 GMT
Mohit Sabharwal created HIVE-9181:

             Summary: Fix SkewJoinOptimizer related Java 8 ordering differences
                 Key: HIVE-9181
             Project: Hive
          Issue Type: Sub-task
          Components: Tests
            Reporter: Mohit Sabharwal
            Assignee: Mohit Sabharwal

(1) {{SkewJoinOptimizer}} adds items to {{ParseContext.topOps}} is different order in Java
8 vs Java 7. This leads to differences in EXPLAIN output related to {{MapWork}}.

(2) Dbproperties order for a "desc database" query is non-deterministic at the HiveMetastore
end between Java 8 and Java 7 (because Thrift maps are un-ordered). 
create database test_db with dbproperties ('key1' = 'value1', 'key2' = 'value2');
desc database extended test_db;
At client side, we serialize the dbproperties map returned from HMS as string and write it
to a temp file. The {{FetchTask}} then reads the temp file and returns the string back to
the user. In test environment, for consistent ordering, we should sort the map before it is
serialized to the temp file.  

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