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https://issues.apache.org/jira/browse/SPARK-22973?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-22973.
---------------------------------
Resolution: Fixed
Fix Version/s: 2.3.0
Issue resolved by pull request 20166
[https://github.com/apache/spark/pull/20166]
> Incorrect results of casting Map to String
> ------------------------------------------
>
> Key: SPARK-22973
> URL: https://issues.apache.org/jira/browse/SPARK-22973
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.1
> Reporter: Takeshi Yamamuro
> Assignee: Takeshi Yamamuro
> Fix For: 2.3.0
>
>
> {code}
> 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|
> +----------------------------------------------------------------+
> {code}
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