Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/20214#discussion_r161358894
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala
---
@@ -1255,6 +1255,34 @@ class DataFrameSuite extends QueryTest with
SharedSQLContext {
assert(testData.select($"*").showString(1, vertical = true) ===
expectedAnswer)
}
+ test("SPARK-23023 Cast rows to strings in showString") {
+ val df1 = Seq(Seq(1, 2, 3, 4)).toDF("a")
+ assert(df1.showString(10) ===
--- End diff --
Since `RowEncoder` deserializer converts nested arrays into `WrappedArray`,
`toString` shows do so in `showString`.
https://github.com/apache/spark/blob/55dbfbca37ce4c05f83180777ba3d4fe2d96a02e/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/encoders/RowEncoder.scala#L304
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