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Date: Thu, 21 Jul 2011 06:57:58 +0000 (UTC)
From: "Hudson (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HIVE-2209) Provide a way by which
 ObjectInspectorUtils.compare can be extended by the caller for comparing
 maps which are part of the object
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    [ https://issues.apache.org/jira/browse/HIVE-2209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13068838#comment-13068838 ] 

Hudson commented on HIVE-2209:
------------------------------

Integrated in Hive-trunk-h0.21 #838 (See [https://builds.apache.org/job/Hive-trunk-h0.21/838/])
    HIVE-2209:add support for map comparision in serde layer (Krishna Kumar via He Yongqiang)

heyongqiang : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1149027
Files : 
* /hive/trunk/serde/src/test/org/apache/hadoop/hive/serde2/objectinspector/TestCrossMapEqualComparer.java
* /hive/trunk/serde/src/java/org/apache/hadoop/hive/serde2/objectinspector/ObjectInspectorUtils.java
* /hive/trunk/serde/src/test/org/apache/hadoop/hive/serde2/objectinspector/TestSimpleMapEqualComparer.java
* /hive/trunk/serde/src/java/org/apache/hadoop/hive/serde2/objectinspector/SimpleMapEqualComparer.java
* /hive/trunk/serde/src/test/org/apache/hadoop/hive/serde2/objectinspector/TestFullMapEqualComparer.java
* /hive/trunk/serde/src/java/org/apache/hadoop/hive/serde2/objectinspector/MapEqualComparer.java
* /hive/trunk/serde/src/java/org/apache/hadoop/hive/serde2/objectinspector/FullMapEqualComparer.java
* /hive/trunk/serde/src/java/org/apache/hadoop/hive/serde2/objectinspector/CrossMapEqualComparer.java


> Provide a way by which ObjectInspectorUtils.compare can be extended by the caller for comparing maps which are part of the object
> ---------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-2209
>                 URL: https://issues.apache.org/jira/browse/HIVE-2209
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Krishna Kumar
>            Assignee: Krishna Kumar
>            Priority: Minor
>         Attachments: HIVE-2209v0.patch, HIVE-2209v2.patch, HIVE2209v1.patch
>
>
> Now ObjectInspectorUtils.compare throws an exception if a map is contained (recursively) within the objects being compared. Two obvious implementations are
> - a simple map comparer which assumes keys of the first map can be used to fetch values from the second
> - a 'cross-product' comparer which compares every pair of key-value pairs in the two maps, and calls a match if and only if all pairs are matched
> Note that it would be difficult to provide a transitive greater-than/less-than indication with maps so that is not in scope. 

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