[GitHub] [spark] LiShuMing opened a new pull request #25192: [SPARK-28436] [SQL] Throw better exception when datasource's schema i…

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LiShuMing opened a new pull request #25192: [SPARK-28436] [SQL] Throw better exception when datasource's schema i…
URL: https://github.com/apache/spark/pull/25192
 
 
   When this exception is thrown, users cannot find what's the difference between datasource's original schema and user-specific schema, and maybe very confused when meet the exception below.
   
   ```
   org.apache.spark.sql.AnalysisException: org.apache.spark.odps.datasource does not allow user-specified schemas.
       at org.apache.spark.sql.execution.datasources.DataSource.resolveRelation(DataSource.scala:347)
       at org.apache.spark.sql.execution.command.CreateDataSourceTableCommand.run(createDataSourceTables.scala:78)
       at org.apache.spark.sql.execution.command.ExecutedCommandExec.sideEffectResult$lzycompute(commands.scala:70)
       at org.apache.spark.sql.execution.command.ExecutedCommandExec.sideEffectResult(commands.scala:68)
       at org.apache.spark.sql.execution.command.ExecutedCommandExec.executeCollect(commands.scala:79)
       at org.apache.spark.sql.Dataset$$anonfun$6.apply(Dataset.scala:190)
       at org.apache.spark.sql.Dataset$$anonfun$6.apply(Dataset.scala:190)
       at org.apache.spark.sql.Dataset$$anonfun$52.apply(Dataset.scala:3270)
       at org.apache.spark.sql.execution.SQLExecution$.withNewExecutionId(SQLExecution.scala:83)
       at org.apache.spark.sql.Dataset.withAction(Dataset.scala:3269)
       at org.apache.spark.sql.Dataset.<init>(Dataset.scala:190)
       at org.apache.spark.sql.Dataset$.ofRows(Dataset.scala:75)
       at org.apache.spark.sql.SparkSession.sql(SparkSession.scala:653)
       at org.apache.spark.sql.SQLContext.sql(SQLContext.scala:714)
   ```

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