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https://issues.apache.org/jira/browse/SPARK-15315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15283042#comment-15283042
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Suresh Thalamati commented on SPARK-15315:
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I am working on submitting PR for this issue , will submit soon.
> CSV datasource writes garbage for complex types instead of rasing error.
> ---------------------------------------------------------------------------
>
> Key: SPARK-15315
> URL: https://issues.apache.org/jira/browse/SPARK-15315
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Suresh Thalamati
> Priority: Minor
>
> Complex types support does not seem to exist yet for csv writer. Error
> should be raised instead of writing garbage into the files.
> Read throw error java.lang.RuntimeException: Unsupported type: map
> Repro:
> {code}
> Seq((1, Map("Tesla" -> 3))).toDF("id", "cars").write.csv("/tmp/output")
> cat part-r-00007-f684166f-ac28-48a1-99dc-1bb2c2ef1164.csv
> 1,org.apache.spark.sql.catalyst.expressions.UnsafeMapData@6d10824e
> Seq((1, Array("Tesla"))).toDF("id",
> "cars").write.mode("overwrite").csv("/tmp/output")
> cat part-r-00007-5bc39b53-25b6-4802-a98d-ec0cbd0e189a.csv
> 1,org.apache.spark.sql.catalyst.expressions.UnsafeArrayData@a7e180b5
> scala> Seq((1, "Tesla")).toDF("id", "name").select(struct("id",
> "name")).write.mode("overwrite").csv("/tmp/output")
> cat part-r-00007-e0c688e1-e04d-4fa0-baf9-31183871ef6d.csv
> "[0,1,1800000005,616c736554]"
> {code}
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