Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/15996#discussion_r93723027
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/test/DataFrameReaderWriterSuite.scala
---
@@ -635,4 +638,13 @@ class DataFrameReaderWriterSuite extends QueryTest
with SharedSQLContext with Be
checkAnswer(spark.table("t"), Row(1, "a") :: Row(2, "b") :: Nil)
}
}
+
+ test("use saveAsTable to append to a data source table implementing
CreatableRelationProvider") {
+ withTable("t") {
+ val provider = "org.apache.spark.sql.test.DefaultSource"
--- End diff --
The data source is defined in this file:
https://github.com/apache/spark/pull/15996/files#diff-b9ddfbc9be8d83ecf100b3b8ff9610b9R48
I think it's easy to tell that it extends `CreatableRelationProvider` but
not return a `InsertableRelation`
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