Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/8840#discussion_r43775098
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/PartitioningUtils.scala
---
@@ -87,6 +89,12 @@ private[sql] object PartitioningUtils {
} else {
// This dataset is partitioned. We need to check whether all
partitions have the same
// partition columns and resolve potential type conflicts.
+ val basePaths = optBasePaths.flatMap(x => x)
+ assert(
+ basePaths.distinct.size == 1,
+ "Conflicting directory structures detected. Suspicious paths:\b" +
+ basePaths.mkString("\n\t", "\n\t", "\n\n"))
--- End diff --
Can you give a case that we will hit this branch? What will `basePaths` be
at here?
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