[ https://issues.apache.org/jira/browse/SPARK-33959?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Hyukjin Kwon resolved SPARK-33959. ---------------------------------- Fix Version/s: 3.2.0 Resolution: Fixed Issue resolved by pull request 30991 [https://github.com/apache/spark/pull/30991] > Improve the statistics estimation of the Tail > --------------------------------------------- > > Key: SPARK-33959 > URL: https://issues.apache.org/jira/browse/SPARK-33959 > Project: Spark > Issue Type: Improvement > Components: SQL > Affects Versions: 3.2.0 > Reporter: Yuming Wang > Assignee: Yuming Wang > Priority: Major > Fix For: 3.2.0 > > > {code:scala} > spark.sql("set spark.sql.cbo.enabled=true") > spark.range(100).selectExpr("id as a", "id as b", "id as c", "id as > e").write.saveAsTable("t1") > println(Tail(Literal(5), spark.sql("SELECT * FROM > t1").queryExecution.logical).queryExecution.explainString(org.apache.spark.sql.execution.CostMode)) > {code} > Current: > {noformat} > == Optimized Logical Plan == > Tail 5, Statistics(sizeInBytes=3.8 KiB) > +- Relation[a#24L,b#25L,c#26L,e#27L] parquet, Statistics(sizeInBytes=3.8 KiB) > {noformat} > Expected: > {noformat} > == Optimized Logical Plan == > Tail 5, Statistics(sizeInBytes=200.0 B, rowCount=5) > +- Relation[a#24L,b#25L,c#26L,e#27L] parquet, Statistics(sizeInBytes=3.8 KiB) > {noformat} -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org