Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/16313#discussion_r92928101 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/command/createDataSourceTables.scala --- @@ -157,39 +156,74 @@ case class CreateDataSourceTableAsSelectCommand( // Since the table already exists and the save mode is Ignore, we will just return. return Seq.empty[Row] case SaveMode.Append => + val existingTable = sessionState.catalog.getTableMetadata(tableIdentWithDB) + if (existingTable.tableType == CatalogTableType.VIEW) { + throw new AnalysisException("Saving data into a view is not allowed.") --- End diff -- We already have [an assert](https://github.com/cloud-fan/spark/blob/b1dbd0a19a174eaae1aaf114e04f6d3683ea65c4/sql/core/src/main/scala/org/apache/spark/sql/execution/command/createDataSourceTables.scala#L133) at the beginning of this function. We need to improve the error message there. That can cover more cases. So far, the error message is pretty confusing. ``` assertion failed java.lang.AssertionError: assertion failed at scala.Predef$.assert(Predef.scala:156) ``` We can add a test case for it. ```Scala val df = spark.range(1, 10).toDF("id1") df.write.saveAsTable("tab1") spark.sql("create view view1 as select * from tab1") df.write.mode(SaveMode.Append).format("parquet").saveAsTable("view1") ```
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