Krishna Shekhram created SPARK-14108:
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Summary: calling count() on empty dataframe throws
java.util.NoSuchElementException
Key: SPARK-14108
URL: https://issues.apache.org/jira/browse/SPARK-14108
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 1.6.1
Environment: Tested in Hadoop 2.7.2 EMR 4.x
Reporter: Krishna Shekhram
Priority: Minor
When calling count() on empty dataframe, then spark code still tries to iterate
through the empty iterator and throws java.util.NoSuchElementException.
Stacktrace :
java.util.NoSuchElementException: next on empty iterator
at scala.collection.Iterator$$anon$2.next(Iterator.scala:39)
at scala.collection.Iterator$$anon$2.next(Iterator.scala:37)
at
scala.collection.IndexedSeqLike$Elements.next(IndexedSeqLike.scala:64)
at scala.collection.IterableLike$class.head(IterableLike.scala:91)
at
scala.collection.mutable.ArrayOps$ofRef.scala$collection$IndexedSeqOptimized$$super$head(ArrayOps.scala:108)
at
scala.collection.IndexedSeqOptimized$class.head(IndexedSeqOptimized.scala:120)
at scala.collection.mutable.ArrayOps$ofRef.head(ArrayOps.scala:108)
at
org.apache.spark.sql.DataFrame$$anonfun$count$1.apply(DataFrame.scala:1515)
at
org.apache.spark.sql.DataFrame$$anonfun$count$1.apply(DataFrame.scala:1514)
at org.apache.spark.sql.DataFrame.withCallback(DataFrame.scala:2099)
at org.apache.spark.sql.DataFrame.count(DataFrame.scala:1514)
Code Snippet:
This code fails
if(this.df !=null){
long countOfRows = this.df.count();
}
If I do this then it works
if(this.df !=null && ! this.df.rdd().isEmpty()){
long countOfRows = this.df.count();
}
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