Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/22688#discussion_r224153758 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/sources/v2/DataSourceV2Suite.scala --- @@ -190,12 +190,13 @@ class DataSourceV2Suite extends QueryTest with SharedSQLContext { test("simple writable data source") { // TODO: java implementation. + val writeOnlySource = classOf[SimpleWriteOnlyDataSource] --- End diff -- can we create a new test case?
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