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https://issues.apache.org/jira/browse/SPARK-16401?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan updated SPARK-16401:
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Fix Version/s: 2.1.0
> Data Source APIs: Extending RelationProvider and CreatableRelationProvider
> Without SchemaRelationProvider
> ---------------------------------------------------------------------------------------------------------
>
> Key: SPARK-16401
> URL: https://issues.apache.org/jira/browse/SPARK-16401
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Xiao Li
> Assignee: Xiao Li
> Priority: Critical
> Fix For: 2.0.1, 2.1.0
>
>
> When users try to implement a data source API with extending only
> RelationProvider and CreatableRelationProvider, they will hit an error when
> resolving the relation.
> {noformat}
> spark.read
> .format("org.apache.spark.sql.test.DefaultSourceWithoutUserSpecifiedSchema")
> .load()
> .write.
> format("org.apache.spark.sql.test.DefaultSourceWithoutUserSpecifiedSchema")
> .save()
> {noformat}
> The error they hit is like
> {noformat}
> xyzDataSource does not allow user-specified schemas.;
> org.apache.spark.sql.AnalysisException: xyzDataSource does not allow
> user-specified schemas.;
> at
> org.apache.spark.sql.execution.datasources.DataSource.resolveRelation(DataSource.scala:319)
> at
> org.apache.spark.sql.execution.datasources.DataSource.write(DataSource.scala:494)
> at org.apache.spark.sql.DataFrameWriter.save(DataFrameWriter.scala:211)
> {noformat}
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