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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2017/01/18 08:15:26 UTC
[jira] [Assigned] (SPARK-19271) Change non-cbo estimation of
aggregate
[ https://issues.apache.org/jira/browse/SPARK-19271?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-19271:
------------------------------------
Assignee: Apache Spark
> Change non-cbo estimation of aggregate
> --------------------------------------
>
> Key: SPARK-19271
> URL: https://issues.apache.org/jira/browse/SPARK-19271
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Zhenhua Wang
> Assignee: Apache Spark
>
> Change non-cbo estimation behavior of aggregate:
> If groupExpression is empty, we can know row count (=1) and the corresponding size;
> otherwise, estimation falls back to UnaryNode's computeStats method, which should not propagate rowCount and attributeStats in Statistics because they are not estimated in that method.
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