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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2019/06/18 19:54:00 UTC
[jira] [Assigned] (SPARK-28096) Lazy val performance pitfall in
Spark SQL LogicalPlans
[ https://issues.apache.org/jira/browse/SPARK-28096?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-28096:
------------------------------------
Assignee: (was: Apache Spark)
> Lazy val performance pitfall in Spark SQL LogicalPlans
> ------------------------------------------------------
>
> Key: SPARK-28096
> URL: https://issues.apache.org/jira/browse/SPARK-28096
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Yesheng Ma
> Priority: Major
>
> The original {{references}} and {{validConstraints}} implementations in a few QueryPlan and Expression classes are methods, which means unnecessary re-computation can happen at times. This PR resolves this problem by making these method lazy vals.
> We benchmarked this optimization on TPC-DS queries whose planning time is longer than 1s. In the benchmark, we warmed up the queries 5 iterations and then took the average of 10 runs. Results showed that this micro-optimization can improve the end-to-end planning time by 25%.
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