Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/7514#discussion_r35997753
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/commands.scala
---
@@ -244,34 +244,65 @@ private[sql] case class InsertIntoHadoopFsRelation(
}
def writeRows(taskContext: TaskContext, iterator:
Iterator[InternalRow]): Unit = {
+ // Track which rows have been output to disk so that if a data sort
is necessary mid-write,
+ // we don't end up outputting the same data twice
+ val writtenRows: HashSet[InternalRow] = new HashSet[InternalRow]
--- End diff --
Once we make sure that only visit the items once, then the rows will not be
outputted twice.
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