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Posted to issues@spark.apache.org by "DB Tsai (JIRA)" <ji...@apache.org> on 2019/05/24 20:46:00 UTC

[jira] [Created] (SPARK-27838) Support user provided non-nullable avro schema for nullable catalyst schema without any null record

DB Tsai created SPARK-27838:
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             Summary: 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
             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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