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From "Szehon Ho (JIRA)" <>
Subject [jira] [Commented] (HIVE-8911) Enable mapjoin hints [Spark Branch]
Date Thu, 11 Dec 2014 19:52:13 GMT


Szehon Ho commented on HIVE-8911:

Hi Chao, patch looks great.  My only preference would be to do it another way that doesn't
affect the main class. For example can we make a subclass and override some methods?

> Enable mapjoin hints [Spark Branch]
> -----------------------------------
>                 Key: HIVE-8911
>                 URL:
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Spark
>    Affects Versions: spark-branch
>            Reporter: Szehon Ho
>            Assignee: Chao
>         Attachments: HIVE-8911.1-spark.patch, HIVE-8911.2-spark.patch
> Currently the big table selection in a mapjoin is based on stats.
> We should also enable the big-table selection based on hints.  See class MapJoinProcessor.
 This is a logical-optimizer class, so we should be able to re-use this without too many changes
to hook up with SparkMapJoinResolver.

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