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https://issues.apache.org/jira/browse/SPARK-27669?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-27669:
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Assignee: Apache Spark
> Refactor DataFrameWriter to resolve datasources in a command
> ------------------------------------------------------------
>
> Key: SPARK-27669
> URL: https://issues.apache.org/jira/browse/SPARK-27669
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.4.3
> Reporter: Eric Liang
> Assignee: Apache Spark
> Priority: Major
>
> Currently, DataFrameWriter.save() does a large amount of ad-hoc analysis
> (e.g., loading data source classes, validating options, and so on) before
> executing the command.
> The execution of this code falls outside the scope of any SQL execution,
> which is unfortunate since it means it's untracked by Spark (e.g., in the
> Spark UI), and also means df.write ops cannot be manipulated by custom
> catalyst rules prior to execution.
> These issues can be largely resolved by creating a command that represents
> df.write.save/saveAsTable().
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