Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/15996#discussion_r93730700
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/test/DataFrameReaderWriterSuite.scala
---
@@ -643,6 +644,14 @@ class DataFrameReaderWriterSuite extends QueryTest
with SharedSQLContext with Be
withTable("t") {
val provider = "org.apache.spark.sql.test.DefaultSource"
sql(s"CREATE TABLE t USING $provider")
+
+ // make sure the data source doesn't provide `InsertableRelation`,
so that we can only append
+ // data to it with `CreatableRelationProvider.createRelation`
--- End diff --
One last comment. Let's explicitly say that we want to test the case that a
data source is a CreatableRelationProvider but its relation does not implement
InsertableRelation.
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