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https://issues.apache.org/jira/browse/SPARK-39678?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-39678:
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Assignee: Apache Spark
> Improve stats estimation for v2 tables
> --------------------------------------
>
> Key: SPARK-39678
> URL: https://issues.apache.org/jira/browse/SPARK-39678
> Project: Spark
> Issue Type: Improvement
> Components: Optimizer
> Affects Versions: 3.3.0
> Reporter: Prashant Singh
> Assignee: Apache Spark
> Priority: Minor
>
> In case of v2 tables, connectors can bubble up both [sizeInBytes and rowCount
> |https://github.com/apache/spark/blob/master/sql/catalyst/src/main/java/org/apache/spark/sql/connector/read/Statistics.java].
> Presently, SizeInBytesOnlyStatsPlanVisitor, ommits propagating / estimating
> rowCount stats, some places like :
> *
> [CodePointer1|https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/statsEstimation/SizeInBytesOnlyStatsPlanVisitor.scala#L54-L58]
> * [CodePointer2
> |https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/statsEstimation/SizeInBytesOnlyStatsPlanVisitor.scala#L46-L47]
> For the
> [non-cbo|https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/statsEstimation/LogicalPlanStats.scala#L34-L39]
> flow, as per my understanding, this can improve the stats estimation, since
> rowcount is indirectly used in places to estimate the size as well.
>
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