Xiao Li created SPARK-16401:
-------------------------------
Summary: 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
Priority: Critical
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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