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Posted to issues@spark.apache.org by "Erik Krogen (Jira)" <ji...@apache.org> on 2022/03/03 19:55:00 UTC

[jira] [Commented] (SPARK-38408) Add option for partial nested field writes with nullable fields.

    [ https://issues.apache.org/jira/browse/SPARK-38408?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17501008#comment-17501008 ] 

Erik Krogen commented on SPARK-38408:
-------------------------------------

Sounds very similar to what was done in SPARK-34378 for the Avro datasource specifically. Is what you're discussing a general feature, or specific to a datasource? I don't quite follow the use-case.

> Add option for partial nested field writes with nullable fields.
> ----------------------------------------------------------------
>
>                 Key: SPARK-38408
>                 URL: https://issues.apache.org/jira/browse/SPARK-38408
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.3.0
>            Reporter: Holden Karau
>            Priority: Major
>
> If a nested field has nullable entries a user shouldn't have to specify all of the fields, instead the nullable fields can have the default value of null. This will allow for more effective schema migration. We might want to put this behind a feature flag though.



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