[SPARK-22973] Incorrect results of casting Map to String

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.2.1
• Fix Version/s: 2.3.0
• Component/s: SQL
• Assignee: Takeshi Yamamuro
• Reporter: Takeshi Yamamuro
• Created: 05/Jan/18 15:35
• Updated: 07/Jan/18 05:43
• Resolved: 07/Jan/18 05:43

Description

scala> Seq(Map(1 -> "a", 2 -> "b")).toDF("a").write.saveAsTable("t")
scala> sql("SELECT cast(a as String) FROM t").show(false)
+----------------------------------------------------------------+
|a                                                               |
+----------------------------------------------------------------+
|org.apache.spark.sql.catalyst.expressions.UnsafeMapData@38bdd75d|
+----------------------------------------------------------------+

Issue Links

• links to: [Github] Pull Request #20166 (maropu)