Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/20585#discussion_r167566823
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/jdbc/JDBCSuite.scala
---
@@ -1168,4 +1168,26 @@ class JDBCSuite extends SparkFunSuite
val df3 = sql("SELECT * FROM test_sessionInitStatement")
assert(df3.collect() === Array(Row(21519, 1234)))
}
+
+ test("jdbc data source shouldn't have metadata in its schema") {
--- End diff --
`shouldn't have unnecessary metadata ...`?
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