You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@spark.apache.org by "Davies Liu (JIRA)" <ji...@apache.org> on 2016/10/21 17:46:58 UTC
[jira] [Created] (SPARK-18055) Dataset.flatMap can't work with
types from customized jar
Davies Liu created SPARK-18055:
----------------------------------
Summary: Dataset.flatMap can't work with types from customized jar
Key: SPARK-18055
URL: https://issues.apache.org/jira/browse/SPARK-18055
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.0.1
Reporter: Davies Liu
Try to apply flatMap() on Dataset column which of of type
com.A.B
Here's a schema of a dataset:
root
|-- id: string (nullable = true)
|-- outputs: array (nullable = true)
| |-- element: string
flatMap works on RDD
{code}
ds.rdd.flatMap(_.outputs)
{code}
flatMap doesnt work on dataset and gives the following error
{code}
ds.flatMap(_.outputs)
{code}
The exception:
{code}
scala.ScalaReflectionException: class com.relateiq.company.CompanySourceOutputMessage in JavaMirror … not found
at scala.reflect.internal.Mirrors$RootsBase.staticClass(Mirrors.scala:123)
at scala.reflect.internal.Mirrors$RootsBase.staticClass(Mirrors.scala:22)
at line189424fbb8cd47b3b62dc41e417841c159.$read$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$iw$$typecreator3$1.apply(<console>:51)
at scala.reflect.api.TypeTags$WeakTypeTagImpl.tpe$lzycompute(TypeTags.scala:232)
at scala.reflect.api.TypeTags$WeakTypeTagImpl.tpe(TypeTags.scala:232)
at org.apache.spark.sql.SQLImplicits$$typecreator9$1.apply(SQLImplicits.scala:125)
at scala.reflect.api.TypeTags$WeakTypeTagImpl.tpe$lzycompute(TypeTags.scala:232)
at scala.reflect.api.TypeTags$WeakTypeTagImpl.tpe(TypeTags.scala:232)
at org.apache.spark.sql.catalyst.encoders.ExpressionEncoder$.apply(ExpressionEncoder.scala:49)
at org.apache.spark.sql.SQLImplicits.newProductSeqEncoder(SQLImplicits.scala:125)
{code}
Spoke to Michael Armbrust and he confirmed it as a Dataset bug.
There is a workaround using explode()
{code}
ds.select(explode(col("outputs")))
{code}
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscribe@spark.apache.org
For additional commands, e-mail: issues-help@spark.apache.org