Ryan Blue created SPARK-23398:

             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 

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