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https://issues.apache.org/jira/browse/HIVE-9492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14300846#comment-14300846
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Lefty Leverenz commented on HIVE-9492:
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Doc review: Please capitalize Hive and Spark in the parameter description, and
change initial "If" to "Whether". And shouldn't "mapinput" be "MapInput"?
{code}
+ HIVE_CACHE_MAPINPUT("hive.exec.cache.mapinput", false,
+ "Whether Hive (in Spark mode only) should cache MapInput if it
applies."),
{code}
> Enable caching in MapInput for Spark
> ------------------------------------
>
> Key: HIVE-9492
> URL: https://issues.apache.org/jira/browse/HIVE-9492
> Project: Hive
> Issue Type: Bug
> Components: Spark
> Reporter: Xuefu Zhang
> Assignee: Jimmy Xiang
> Fix For: spark-branch
>
> Attachments: HIVE-9492.1-spark.patch, HIVE-9492.2-spark.patch,
> prototype.patch
>
>
> Because of the IOContext problem (HIVE-8920, HIVE-9084), RDD caching is
> currently disabled in MapInput. Prototyping shows that the problem can
> solved. Thus, we should formalize the prototype and enable the caching. A
> good query to test this is:
> {code}
> from (select * from dec union all select * from dec2) s
> insert overwrite table dec3 select s.name, sum(s.value) group by s.name
> insert overwrite table dec4 select s.name, s.value order by s.value;
> {code}
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