Mohit Sabharwal created HIVE-9181:
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Summary: Fix SkewJoinOptimizer related Java 8 ordering differences
Key: HIVE-9181
URL: https://issues.apache.org/jira/browse/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).
{code}
create database test_db with dbproperties ('key1' = 'value1', 'key2' =
'value2');
desc database extended test_db;
{code}
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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