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https://issues.apache.org/jira/browse/SPARK-41636?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon reassigned SPARK-41636:
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Assignee: Jia Fan
> DataSourceStrategy#selectFilters returns predicates in non-deterministic order
> ------------------------------------------------------------------------------
>
> Key: SPARK-41636
> URL: https://issues.apache.org/jira/browse/SPARK-41636
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.1.0, 3.4.0, 3.4.1
> Reporter: Jonny Serencsa
> Assignee: Jia Fan
> Priority: Major
> Fix For: 3.5.0, 4.0.0
>
>
> Method
> org.apache.spark.sql.execution.datasources.DataSourceStrategy#selectFilters,
> which is used to determine "pushdown-able" filters, does not preserve the
> order of the input {{Seq[Expression]}} nor does it return the same order
> across the same plans (modulo ExprId differences). This is resulting in
> CodeGenerator cache misses even when the exact same LogicalPlan is executed.
> The aforementioned method does not attempt to maintain the order of the input
> predicates, though it happens to do so when there are less than 5
> pushdown-able {{Expression}} in the input (due to some "small maps" logic in
> {{{}scala.collection.TraversableOnce#toMap{}}}).
> Returning in the same order as the input will reduce churn on the
> CodeGenerator cache under prolonged workloads that execute queries that are
> very similar.
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