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org.apache.spark.sql.test.DefaultSourceWithoutUserSpecifiedSchema does not allow user-specified schemas.;
org.apache.spark.sql.AnalysisException: org.apache.spark.sql.test.DefaultSourceWithoutUserSpecifiedSchema 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)