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https://issues.apache.org/jira/browse/SPARK-59580?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated SPARK-59580:
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Labels: pull-request-available (was: )
> TreeNode construction allocates unused cache state
> --------------------------------------------------
>
> Key: SPARK-59580
> URL: https://issues.apache.org/jira/browse/SPARK-59580
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 4.2.0
> Reporter: Ben Hollis
> Priority: Minor
> Labels: pull-request-available
>
> Every Catalyst {{TreeNode}} eagerly allocates cache objects and initializer
> closures for five properties. Most nodes never read all five properties, so
> expression and plan construction pays for cache state that is never used.
> This overhead compounds across large Catalyst trees. On the measured JVM,
> constructing an otherwise unused {{Literal}} allocates 280 bytes, of which
> 199 bytes are avoidable cache overhead. The same overhead affects
> expressions, logical plans, physical plans, and other {{TreeNode}} subclasses.
> Acceptance criteria:
> * Constructing tree nodes does not allocate cache objects for properties
> that are never read.
> * Existing {{TreeNode}} behavior and concurrency guarantees remain unchanged.
> * A regression test detects renewed unused cache allocation.
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