Pavel created SPARK-9033:
----------------------------
Summary: scala.MatchError: interface java.util.Map (of class
java.lang.Class) with Spark SQL
Key: SPARK-9033
URL: https://issues.apache.org/jira/browse/SPARK-9033
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 1.3.1, 1.2.2
Reporter: Pavel
I've a java.util.Map<String, String> field in a POJO class and I'm trying to
use it to createDataFrame (1.3.1) / applySchema(1.2.2) with the SQLContext and
getting following error in both 1.2.2 & 1.3.1 versions of the Spark SQL:
*sample code:
SQLContext sqlCtx = new SQLContext(sc.sc());
JavaRDD<Event> rdd = sc.textFile("/path").map(line-> Event.fromString(line));
//text line is splitted and assigned to respective field of the event class here
DataFrame schemaRDD = sqlCtx.createDataFrame(rdd, Event.class); <-- error
thrown here
schemaRDD.registerTempTable("events");
Event class is a Serializable. This issue occurs also with Spark streaming when
used with SQL.
JavaDStream<String> receiverStream = jssc.receiverStream(new
StreamingReceiver());
JavaDStream<String> windowDStream = receiverStream.window(WINDOW_LENGTH,
SLIDE_INTERVAL);
jssc.checkpoint("event-streaming");
windowDStream.foreachRDD(evRDD -> {
if(evRDD.count() == 0) return null;
DataFrame schemaRDD = sqlCtx.createDataFrame(evRDD, Event.class);
schemaRDD.registerTempTable("events");
...
}
*error:
scala.MatchError: interface java.util.Map (of class java.lang.Class)
at
org.apache.spark.sql.SQLContext$$anonfun$getSchema$1.apply(SQLContext.scala:1193)
~[spark-sql_2.10-1.3.1.jar:1.3.1]
at
org.apache.spark.sql.SQLContext$$anonfun$getSchema$1.apply(SQLContext.scala:1192)
~[spark-sql_2.10-1.3.1.jar:1.3.1]
at
scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
~[scala-library-2.10.5.jar:na]
at
scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
~[scala-library-2.10.5.jar:na]
at
scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
~[scala-library-2.10.5.jar:na]
at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:108)
~[scala-library-2.10.5.jar:na]
at
scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
~[scala-library-2.10.5.jar:na]
at scala.collection.mutable.ArrayOps$ofRef.map(ArrayOps.scala:108)
~[scala-library-2.10.5.jar:na]
at org.apache.spark.sql.SQLContext.getSchema(SQLContext.scala:1192)
~[spark-sql_2.10-1.3.1.jar:1.3.1]
at
org.apache.spark.sql.SQLContext.createDataFrame(SQLContext.scala:437)
~[spark-sql_2.10-1.3.1.jar:1.3.1]
at
org.apache.spark.sql.SQLContext.createDataFrame(SQLContext.scala:465)
~[spark-sql_2.10-1.3.1.jar:1.3.1]
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