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Posted to issues@spark.apache.org by "Reynold Xin (JIRA)" <ji...@apache.org> on 2014/06/18 09:31:11 UTC
[jira] [Created] (SPARK-2176) extra unnecessary exchange operator
in group by
Reynold Xin created SPARK-2176:
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Summary: extra unnecessary exchange operator in group by
Key: SPARK-2176
URL: https://issues.apache.org/jira/browse/SPARK-2176
Project: Spark
Issue Type: Bug
Components: SQL
Reporter: Reynold Xin
Assignee: Yin Huai
{code}
hql("explain select * from src group by key").collect().foreach(println)
[ExplainCommand [plan#27:0]]
[ Aggregate false, [key#25], [key#25,value#26]]
[ Exchange (HashPartitioning [key#25:0], 200)]
[ Exchange (HashPartitioning [key#25:0], 200)]
[ Aggregate true, [key#25], [key#25]]
[ HiveTableScan [key#25,value#26], (MetastoreRelation default, src, None), None]
{code}
There are two exchange operators.
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