Yesheng Ma created SPARK-28096:
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Summary: 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
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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