Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/15245#discussion_r80567861
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/RecordReaderIterator.scala
---
@@ -38,7 +41,7 @@ class RecordReaderIterator[T](rowReader: RecordReader[_,
T]) extends Iterator[T]
// Close and release the reader here; close() will also be called
when the task
// completes, but for tasks that read from many files, it helps to
release the
// resources early.
- rowReader.close()
--- End diff --
This is `CompletionIterator`-style cleanup.
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