Github user davies commented on a diff in the pull request:

    https://github.com/apache/spark/pull/10855#discussion_r50947591
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/BufferedRowIterator.java 
---
    @@ -34,7 +36,7 @@
       // used when there is no column in output
       protected UnsafeRow unsafeRow = new UnsafeRow(0);
     
    -  public boolean hasNext() {
    +  public boolean hasNext() throws IOException {
    --- End diff --
    
    The KVIterator will throws IOException, we need to propagate it here.


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