Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/22688#discussion_r224316130 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/sources/v2/DataSourceV2Suite.scala --- @@ -351,6 +351,21 @@ class DataSourceV2Suite extends QueryTest with SharedSQLContext { } } } + + test("SPARK-25700: do not read schema when writing in other modes except append mode") { + withTempPath { file => + val cls = classOf[SimpleWriteOnlyDataSource] + val path = file.getCanonicalPath + val df = spark.range(5).select($"id", $"id") --- End diff -- The write path looks requiring two columns: https://github.com/apache/spark/blob/e06da95cd9423f55cdb154a2778b0bddf7be984c/sql/core/src/test/scala/org/apache/spark/sql/sources/v2/SimpleWritableDataSource.scala#L214
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