[jira] [Created] (HIVE-8262) Create CacheTran that transform the input RDD by caching it

["Xuefu Zhang (JIRA)" <ji...@apache.org>]

Xuefu Zhang created HIVE-8262:
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             Summary: Create CacheTran that transform the input RDD by caching it
                 Key: HIVE-8262
                 URL: https://issues.apache.org/jira/browse/HIVE-8262
             Project: Hive
          Issue Type: Sub-task
          Components: Spark
            Reporter: Xuefu Zhang


In a few cases we need to cache a RDD to avoid recompute it for better performance. However, caching a map input RDD is different from caching a regular RDD due to SPARK-3693. The way to cache a Hadoop RDD, which is the input to MapWork, is to cache, the result RDD that is transformed from the original Hadoop RDD by applying a map function, in which <key, value> pairs are copied. To cache intermediate RDDs, such as that from a shuffle, is just calling .cache().

This task is to create a CacheTran to capture this, which can be used to plug in Spark Plan when caching is desirable. 



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