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Posted to issues@spark.apache.org by "Micah Kornfield (Jira)" <ji...@apache.org> on 2020/06/24 21:07:00 UTC
[jira] [Updated] (SPARK-32095) [DataSource V2] Documentation on
SupportsReportStatistics Outdated?
[ https://issues.apache.org/jira/browse/SPARK-32095?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Micah Kornfield updated SPARK-32095:
------------------------------------
Priority: Minor (was: Major)
> [DataSource V2] Documentation on SupportsReportStatistics Outdated?
> -------------------------------------------------------------------
>
> Key: SPARK-32095
> URL: https://issues.apache.org/jira/browse/SPARK-32095
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.4.6, 3.0.0
> Reporter: Micah Kornfield
> Priority: Minor
>
> I was wondering if the documentation on SupportsReportStatistics [1][3] about its interaction with the planner and predicate pushdowns is still accurate. It says:
> "Implementations that return more accurate statistics based on pushed operators will not improve query performance until the planner can push operators before getting stats."
>
> Is this still accurate? When looking through the code it seems like there is now functionality that explicitly wants the operators pushed down [2]. Is the documentation for SupportsReportStatistics referring to something other than [2] or should it be updated?
>
> [[1]https://spark.apache.org/docs/2.4.6/api/java/org/apache/spark/sql/sources/v2/reader/SupportsReportStatistics.html|https://spark.apache.org/docs/2.4.6/api/java/org/apache/spark/sql/sources/v2/reader/SupportsReportStatistics.html]
> [2] [https://github.com/apache/spark/blob/d0800fc8e2e71a79bf0f72c3e4bc608ae34053e7/sql/catalyst/src/main/scala/org/apache/spark/sql/execution/datasources/v2/DataSourceV2Relation.scala#L86]
> [3][https://spark.apache.org/docs/3.0.0-preview/api/java/org/apache/spark/sql/connector/read/SupportsReportStatistics.html]
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