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https://issues.apache.org/jira/browse/SPARK-10304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14723994#comment-14723994
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Zhan Zhang commented on SPARK-10304:
------------------------------------
[~yhuai] I think the NPE is caused by the directory has multiple table inside.
[~lian cheng] Does the design allow different partition spec. For example, one
part of the table is partitioned by key1, key2, the second part is partitioned
by key1 only and the third part is not partitioned? If so, then it is hard to
decide whether the directory is valid or not. Otherwise, we can simply check
the consistency of partitionspec and throw exceptions if not consistent.
> Partition discovery does not throw an exception if the dir structure is valid
> -----------------------------------------------------------------------------
>
> Key: SPARK-10304
> URL: https://issues.apache.org/jira/browse/SPARK-10304
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Yin Huai
> Assignee: Zhan Zhang
> Priority: Critical
>
> I have a dir structure like {{/path/table1/partition_column=1/}}. When I try
> to use {{load("/path/")}}, it works and I get a DF. When I query this DF, if
> it is stored as ORC, there will be the following NPE. But, if it is Parquet,
> we even can return rows. We should complain to users about the dir struct
> because {{table1}} does not meet our format.
> {code}
> org.apache.spark.SparkException: Job aborted due to stage failure: Task 26 in
> stage 57.0 failed 4 times, most recent failure: Lost task 26.3 in stage 57.0
> (TID 3504, 10.0.195.227): java.lang.NullPointerException
> at
> org.apache.spark.sql.hive.HiveInspectors$class.unwrapperFor(HiveInspectors.scala:466)
> at
> org.apache.spark.sql.hive.orc.OrcTableScan.unwrapperFor(OrcRelation.scala:224)
> at
> org.apache.spark.sql.hive.orc.OrcTableScan$$anonfun$org$apache$spark$sql$hive$orc$OrcTableScan$$fillObject$1$$anonfun$9.apply(OrcRelation.scala:261)
> at
> org.apache.spark.sql.hive.orc.OrcTableScan$$anonfun$org$apache$spark$sql$hive$orc$OrcTableScan$$fillObject$1$$anonfun$9.apply(OrcRelation.scala:261)
> at
> scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
> at
> scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
> at scala.collection.immutable.List.foreach(List.scala:318)
> at scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
> at scala.collection.AbstractTraversable.map(Traversable.scala:105)
> at
> org.apache.spark.sql.hive.orc.OrcTableScan$$anonfun$org$apache$spark$sql$hive$orc$OrcTableScan$$fillObject$1.apply(OrcRelation.scala:261)
> at
> org.apache.spark.sql.hive.orc.OrcTableScan$$anonfun$org$apache$spark$sql$hive$orc$OrcTableScan$$fillObject$1.apply(OrcRelation.scala:256)
> at scala.Option.map(Option.scala:145)
> at
> org.apache.spark.sql.hive.orc.OrcTableScan.org$apache$spark$sql$hive$orc$OrcTableScan$$fillObject(OrcRelation.scala:256)
> at
> org.apache.spark.sql.hive.orc.OrcTableScan$$anonfun$execute$3.apply(OrcRelation.scala:318)
> at
> org.apache.spark.sql.hive.orc.OrcTableScan$$anonfun$execute$3.apply(OrcRelation.scala:316)
> at
> org.apache.spark.rdd.HadoopRDD$HadoopMapPartitionsWithSplitRDD.compute(HadoopRDD.scala:380)
> at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:297)
> at org.apache.spark.rdd.RDD.iterator(RDD.scala:264)
> at
> org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
> at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:297)
> at org.apache.spark.rdd.RDD.iterator(RDD.scala:264)
> at
> org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
> {code}
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