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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