[ https://issues.apache.org/jira/browse/SPARK-25353?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Dooyoung Hwang updated SPARK-25353: ----------------------------------- Summary: executeTake in SparkPlan could decode rows more than necessary. (was: executeTake in SparkPlan could deserialize more than necessary.) > executeTake in SparkPlan could decode rows more than necessary. > --------------------------------------------------------------- > > Key: SPARK-25353 > URL: https://issues.apache.org/jira/browse/SPARK-25353 > Project: Spark > Issue Type: Sub-task > Components: SQL > Affects Versions: 2.3.1 > Reporter: Dooyoung Hwang > Priority: Major > > In some cases, executeTake in SparkPlan could deserialize more than necessary. > For example, df.limit(1000).collect() is executed. > +- executeTake in SparkPlan is called with arg 1000. > +- If total rows count from partitions is 2000, executeTake deserialize > them and create array of InternalRow whose size is 2000. > +- Slice the first 1000 rows, and return them. 1000 rows in the rear > are not used. > -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org