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Posted to issues@spark.apache.org by "Wenchen Fan (Jira)" <ji...@apache.org> on 2026/07/31 07:37:00 UTC
[jira] [Resolved] (SPARK-58315) Improve DSv2 scan statistics handling
[ https://issues.apache.org/jira/browse/SPARK-58315?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Wenchen Fan resolved SPARK-58315.
---------------------------------
Fix Version/s: 4.3.0
Resolution: Fixed
Issue resolved by pull request 57487
[https://github.com/apache/spark/pull/57487]
> Improve DSv2 scan statistics handling
> -------------------------------------
>
> Key: SPARK-58315
> URL: https://issues.apache.org/jira/browse/SPARK-58315
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 4.3.0
> Reporter: Yan Yan
> Assignee: Yan Yan
> Priority: Minor
> Labels: pull-request-available
> Fix For: 4.3.0
>
>
> The DSv2 scan statistics path lags the v1 (toPlanStats) path:
> 1. computeStats always fetches full statistics, even when Spark only needs
> sizeInBytes (CBO/plan stats off). No cheap size-only option for connectors.
> 2. After a filter is fully pushed down, the source may still report whole-table
> stats. Spark can't tell, so it plans on the too-large, pre-filter estimates.
> 3. Statistics from a v1 scan are silently dropped: V1ScanWrapper doesn't
> implement SupportsReportStatistics, so computeStats never sees them.
> 4. When only a row count is reported, Spark uses the default (huge) size instead
> of deriving one from the row count.
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