Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17702#discussion_r122354359
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSource.scala
---
@@ -389,6 +389,23 @@ case class DataSource(
}
/**
+ * Return all paths represented by the wildcard string.
+ */
+ private def getGlobbedPaths(qualified: Path): Seq[Path] = {
--- End diff --
at least we should follow `InMemoryFileIndex.bulkListLeafFiles` and `Picks
the listing strategy adaptively depending on the number of paths to list`
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