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https://issues.apache.org/jira/browse/SPARK-7565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14547957#comment-14547957
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Paul Colomiets commented on SPARK-7565:
---------------------------------------
The pull request is pretty trivial. I've tested it and it solves the problem
for me.
> Broken maps in jsonRDD
> ----------------------
>
> Key: SPARK-7565
> URL: https://issues.apache.org/jira/browse/SPARK-7565
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.4.0
> Reporter: Paul Colomiets
>
> When I use the following JSON:
> {code}
> {"obj": {"a": "hello"}}
> {code}
> And load it with the following python code:
> {code}
> tf = sc.textFile('test.json')
> v = sqlContext.jsonRDD(tf, StructType([StructField("obj",
> MapType(StringType(), StringType()), True)]))
> v.save('test.parquet', mode='overwrite')
> {code}
> I get the following error in spark master branch:
> {code}
> Py4JJavaError: An error occurred while calling o78.save.
> : org.apache.spark.SparkException: Job aborted due to stage failure: Task 1
> in stage 5.0 failed 1 times, most recent failure: Lost task 1.0 in stage 5.0
> (TID 11, localhost): java.lang.ClassCastException: java.lang.String cannot be
> cast to org.apache.spark.sql.types.UTF8String
> at
> org.apache.spark.sql.parquet.RowWriteSupport.writePrimitive(ParquetTableSupport.scala:201)
> at
> org.apache.spark.sql.parquet.RowWriteSupport.writeValue(ParquetTableSupport.scala:192)
> at
> org.apache.spark.sql.parquet.RowWriteSupport$$anonfun$writeMap$2.apply(ParquetTableSupport.scala:284)
> at
> org.apache.spark.sql.parquet.RowWriteSupport$$anonfun$writeMap$2.apply(ParquetTableSupport.scala:281)
> at
> scala.collection.TraversableLike$WithFilter$$anonfun$foreach$1.apply(TraversableLike.scala:772)
> at scala.collection.immutable.Map$Map1.foreach(Map.scala:109)
> at
> scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.scala:771)
> at
> org.apache.spark.sql.parquet.RowWriteSupport.writeMap(ParquetTableSupport.scala:281)
> at
> org.apache.spark.sql.parquet.RowWriteSupport.writeValue(ParquetTableSupport.scala:186)
> at
> org.apache.spark.sql.parquet.RowWriteSupport.write(ParquetTableSupport.scala:171)
> at
> org.apache.spark.sql.parquet.RowWriteSupport.write(ParquetTableSupport.scala:134)
> at
> parquet.hadoop.InternalParquetRecordWriter.write(InternalParquetRecordWriter.java:120)
> at
> parquet.hadoop.ParquetRecordWriter.write(ParquetRecordWriter.java:81)
> at
> parquet.hadoop.ParquetRecordWriter.write(ParquetRecordWriter.java:37)
> at
> org.apache.spark.sql.parquet.ParquetRelation2.org$apache$spark$sql$parquet$ParquetRelation2$$writeShard$1(newParquet.scala:699)
> at
> org.apache.spark.sql.parquet.ParquetRelation2$$anonfun$insert$2.apply(newParquet.scala:717)
> at
> org.apache.spark.sql.parquet.ParquetRelation2$$anonfun$insert$2.apply(newParquet.scala:717)
> at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:63)
> at org.apache.spark.scheduler.Task.run(Task.scala:70)
> at
> org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:213)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:745)
> {code}
> This worked well in spark 1.3
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