Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/15996#discussion_r93719624
--- 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 --
I am thinking that we probably should create a test data source that
explicitly mentions its relation is not an InsertableRelation.
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