Xuefu Zhang created HIVE-9258:
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Summary: Explain query shouldn't launch a Spark application [Spark
Branch]
Key: HIVE-9258
URL: https://issues.apache.org/jira/browse/HIVE-9258
Project: Hive
Issue Type: Sub-task
Components: Spark
Reporter: Xuefu Zhang
Currently for Hive on Spark, query plan includes the number of reducers, which
is determined partly by the Spark cluster. Thus, explain query will need to
launch a Spark application (Spark remote context), which is costly. To make
things worse, the application is discarded right way.
Ideally, we shouldn't launch a Spark application even for an explain query.
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