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Posted to issues@spark.apache.org by "Ryan Blue (JIRA)" <ji...@apache.org> on 2018/02/12 18:16:00 UTC

[jira] [Created] (SPARK-23398) DataSourceV2 should provide a way to get the source schema

Ryan Blue created SPARK-23398:
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             Summary: DataSourceV2 should provide a way to get the source schema
                 Key: SPARK-23398
                 URL: https://issues.apache.org/jira/browse/SPARK-23398
             Project: Spark
          Issue Type: Sub-task
          Components: SQL
    Affects Versions: 2.3.0
            Reporter: Ryan Blue


To validate writes with DataSourceV2, the planner needs to get a source's schema. The current API has no direct way to get that schema. SPARK-23321 instantiates a reader to get the schema, but sources are not required to implement {{ReadSupport}} or {{ReadSupportWithSchema}}. V2 should either add a method to get the schema of a source, or require sources implement {{ReadSupport}}.



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