[jira] [Updated] (HIVE-2223) support grouping on complex types in Hive

["Jonathan Chang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-2223?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Chang updated HIVE-2223:
---------------------------------

    Status: Patch Available  (was: Open)

This adds hashing functions for MAP and LIST object inspectors, and changes the default map comparator to non-null.  These changes allow one to group by complex types.

> support grouping on complex types in Hive
> -----------------------------------------
>
>                 Key: HIVE-2223
>                 URL: https://issues.apache.org/jira/browse/HIVE-2223
>             Project: Hive
>          Issue Type: New Feature
>            Reporter: Kate Ting
>            Assignee: Jonathan Chang
>            Priority: Minor
>         Attachments: HIVE-2223.patch
>
>
> Creating a query with a GROUP BY statement when an array type column is part of the column list is not yet supported:
> CREATE TABLE test_group_by ( key INT, group INT, terms ARRAY<STRING>);
> SELECT key, terms, count(group) FROM test_group_by GROUP BY key, terms;
> ...
> "Hash code on complex types not supported yet."
> java.lang.RuntimeException: Error while closing operators
> at org.apache.hadoop.hive.ql.exec.ExecMapper.close(ExecMapper.java:232)
> at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:57)
> at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:356)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305)
> at org.apache.hadoop.mapred.Child.main(Child.java:170)
> Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: java.lang.RuntimeException: Hash code on complex types not supported yet.
> at org.apache.hadoop.hive.ql.exec.GroupByOperator.closeOp(GroupByOperator.java:799)
> at org.apache.hadoop.hive.ql.exec.Operator.close(Operator.java:462)
> at org.apache.hadoop.hive.ql.exec.Operator.close(Operator.java:470)
> at org.apache.hadoop.hive.ql.exec.Operator.close(Operator.java:470)
> at org.apache.hadoop.hive.ql.exec.Operator.close(Operator.java:470)
> at org.apache.hadoop.hive.ql.exec.ExecMapper.close(ExecMapper.java:211)
> ... 4 more
> Caused by: java.lang.RuntimeException: Hash code on complex types not supported yet.
> at org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorUtils.hashCode(ObjectInspectorUtils.java:348)
> at org.apache.hadoop.hive.ql.exec.ReduceSinkOperator.processOp(ReduceSinkOperator.java:187)
> at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:386)
> at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:598)
> at org.apache.hadoop.hive.ql.exec.GroupByOperator.forward(GroupByOperator.java:746)
> at org.apache.hadoop.hive.ql.exec.GroupByOperator.closeOp(GroupByOperator.java:780)
> ... 9 more

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