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https://issues.apache.org/jira/browse/SPARK-24045?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gengliang Wang resolved SPARK-24045.
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Resolution: Fixed
It is fixed in https://github.com/apache/spark/pull/23383
> Create base class for file data source v2
> -----------------------------------------
>
> Key: SPARK-24045
> URL: https://issues.apache.org/jira/browse/SPARK-24045
> Project: Spark
> Issue Type: Task
> Components: SQL
> Affects Versions: 2.2.1
> Reporter: Gengliang Wang
> Priority: Major
>
> From https://github.com/apache/spark/pull/20933, we can see that during File
> data source V2 migration, falling back to V1 implementation is necessary in
> following cases1. File datasource V2 might be implemented partially during
> migration.
> E.g. if [[ReadSupport]] is implemented while [[WriteSupport]] is not,
> write path should fall back to V1 implementation.
> 2. File datasource V2 implementations cause regression.
> 3. Catalog support is required, which is still under development for data
> source V2.
>
> Create a base class FileDataSourceV2 and resolve the falling back problems.
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