[ https://issues.apache.org/jira/browse/SPARK-19350?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-19350: ------------------------------------ Assignee: Apache Spark > Cardinality estimation of Limit and Sample > ------------------------------------------ > > Key: SPARK-19350 > URL: https://issues.apache.org/jira/browse/SPARK-19350 > Project: Spark > Issue Type: Sub-task > Components: SQL > Reporter: Zhenhua Wang > Assignee: Apache Spark > > Currently, LocalLimit/GlobalLimit/Sample propagates the same row count and > column stats from its child, which is incorrect. > We can get the correct rowCount in Statistics for Limit/Sample whether cbo is > enabled or not. And column stats should not be propagated because we don't > know the distribution of columns after Limit or Sample. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org