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https://issues.apache.org/jira/browse/SPARK-27838?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-27838:
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Assignee: (was: Apache Spark)
> Support user provided non-nullable avro schema for nullable catalyst schema
> without any null record
> ---------------------------------------------------------------------------------------------------
>
> Key: SPARK-27838
> URL: https://issues.apache.org/jira/browse/SPARK-27838
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 2.4.3
> Reporter: DB Tsai
> Priority: Major
> Fix For: 3.0.0
>
>
> When the data is read from the sources, the catalyst schema is always
> nullable. Since Avro uses Union type to represent nullable, when any
> non-nullable avro file is read and then written out, the schema will always
> be changed. This PR provides a solution for users to keep the Avro schema
> without being forced to use Union type.
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