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https://issues.apache.org/jira/browse/SPARK-28217?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-28217:
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Assignee: (was: Apache Spark)
> Allow a custom statistics logical plan visitor to be plugged in.
> ----------------------------------------------------------------
>
> Key: SPARK-28217
> URL: https://issues.apache.org/jira/browse/SPARK-28217
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Terry Kim
> Priority: Major
> Original Estimate: 120h
> Remaining Estimate: 120h
>
> Spark currently has two built-in statistics plan visitor:
> SizeInBytesOnlyStatsPlanVisitor and BasicStatsPlanVisitor. However, this is a
> bit limited since there is no way to plug in a custom plan visitor - from
> which a custom query optimizer can benefit from.
> We can provide a Spark conf that the user can specify to override the
> built-in plan visitor:
> {code:scala}
> // First create your custom stat plan visitor.
> class MyStatsPlanVisitor extends LogicalPlanVisitor[Statistics] {
> // Implement LogicalPlanVisitor[Statistics] trait
> }
> // Set the visitor via Spark conf.
> spark.conf.set("spark.sql.catalyst.statsPlanVisitorClass",
> "MyStatsPlanVisitor")
> // Now, stat() on a LogicalPlan object will use MyStatsPlanVisitor as a stat
> plan visitor.
> {code}
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