Bug: spark.sql.orc.filterPushdown not working with Spark 3.1.1 for tables with varchar data type
Status: Resolved | Priority: Major | Resolution: Fixed
Created: 09/Jun/21 13:39
Affects Version/s: 3.1.1

We are not able to upgrade to Spark 3.1.1 from Spark 2.4.x as the join on varchar column is failing which is unexpected and works on Spark 3.0.0.  We are trying to run it on Spark 3.1.1 (MR 3.2) on K8s 

Below is my use case:

Tables are external hive table and files are stored as ORC. We do have varchar column and when we are trying to perform join on varchar column we are getting the exception.

As I understand Spark 3.1.1 have introduced varchar data type but seems its not well tested with ORC and does not have backward compatibility. I have even tried with below config without luck

*spark.sql.legacy.charVarcharAsString: "true"*

We are not getting the error when *spark.sql.orc.filterPushdown=false*

Below is the code: Here col1 is of type varchar(32) in hive
{code:java}
df = spark.sql("select col1, col2 from table1 a inner join table2 on b (a.col1=b.col1 and a.col2 > b.col2 )") 
df.write.format("orc").option("compression", "zlib").mode("Append").save("<s3_path>")
{code}
Below is the error:

 
{code:java}
Job aborted due to stage failure: Task 43 in stage 5.0 failed 4 times, most recent failure: Lost task 43.3 in stage 5.0 (TID 524) (10.219.36.64 executor 5): java.lang.UnsupportedOperationException: DataType: varchar(32)
	at org.apache.spark.sql.execution.datasources.orc.OrcFilters$.getPredicateLeafType(OrcFilters.scala:150)
	at org.apache.spark.sql.execution.datasources.orc.OrcFilters$.getType$1(OrcFilters.scala:222)
	at org.apache.spark.sql.execution.datasources.orc.OrcFilters$.buildLeafSearchArgument(OrcFilters.scala:266)
	at org.apache.spark.sql.execution.datasources.orc.OrcFilters$.convertibleFiltersHelper$1(OrcFilters.scala:132)
	at org.apache.spark.sql.execution.datasources.orc.OrcFilters$.$anonfun$convertibleFilters$4(OrcFilters.scala:135)
	at scala.collection.TraversableLike.$anonfun$flatMap$1(TraversableLike.scala:245)
	at scala.collection.immutable.List.foreach(List.scala:392)
	at scala.collection.TraversableLike.flatMap(TraversableLike.scala:245)
	at scala.collection.TraversableLike.flatMap$(TraversableLike.scala:242)
	at scala.collection.immutable.List.flatMap(List.scala:355)
	at org.apache.spark.sql.execution.datasources.orc.OrcFilters$.convertibleFilters(OrcFilters.scala:134)
	at org.apache.spark.sql.execution.datasources.orc.OrcFilters$.createFilter(OrcFilters.scala:73)
	at org.apache.spark.sql.execution.datasources.orc.OrcFileFormat.$anonfun$buildReaderWithPartitionValues$4(OrcFileFormat.scala:189)
	at org.apache.spark.sql.execution.datasources.orc.OrcFileFormat.$anonfun$buildReaderWithPartitionValues$4$adapted(OrcFileFormat.scala:188)
	at scala.Option.foreach(Option.scala:407)
	at org.apache.spark.sql.execution.datasources.orc.OrcFileFormat.$anonfun$buildReaderWithPartitionValues$1(OrcFileFormat.scala:188)
	at org.apache.spark.sql.execution.datasources.FileScanRDD$$anon$1.org$apache$spark$sql$execution$datasources$FileScanRDD$$anon$$readCurrentFile(FileScanRDD.scala:116)
	at org.apache.spark.sql.execution.datasources.FileScanRDD$$anon$1.nextIterator(FileScanRDD.scala:169)
	at org.apache.spark.sql.execution.datasources.FileScanRDD$$anon$1.hasNext(FileScanRDD.scala:93)
	at org.apache.spark.sql.execution.FileSourceScanExec$$anon$1.hasNext(DataSourceScanExec.scala:503)
	at org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIteratorForCodegenStage3.columnartorow_nextBatch_0$(Unknown Source)
	at org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIteratorForCodegenStage3.processNext(Unknown Source)
	at org.apache.spark.sql.execution.BufferedRowIterator.hasNext(BufferedRowIterator.java:43)
	at org.apache.spark.sql.execution.WholeStageCodegenExec$$anon$1.hasNext(WholeStageCodegenExec.scala:755)
	at scala.collection.Iterator$$anon$10.hasNext(Iterator.scala:458)
	at org.apache.spark.shuffle.sort.UnsafeShuffleWriter.write(UnsafeShuffleWriter.java:177)
	at org.apache.spark.shuffle.ShuffleWriteProcessor.write(ShuffleWriteProcessor.scala:59)
	at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:99)
	at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:52)
	at org.apache.spark.scheduler.Task.run(Task.scala:131)
	at org.apache.spark.executor.Executor$TaskRunner.$anonfun$run$3(Executor.scala:497)
	at org.apache.spark.util.Utils$.tryWithSafeFinally(Utils.scala:1439)
	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:500)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)

Driver stacktrace:3
{code}
 

I can see there is no mapping of varchar in OrcFilters.scala:150

[https://github.com/apache/spark/blob/v3.1.1/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/orc/OrcFilters.scala#L142]