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https://issues.apache.org/jira/browse/SPARK-28096?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-28096:
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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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