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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