Github user clockfly commented on a diff in the pull request:
https://github.com/apache/spark/pull/13987#discussion_r69067474
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/ListingFileCatalog.scala
---
@@ -58,10 +56,16 @@ class ListingFileCatalog(
}
override protected def leafFiles: mutable.LinkedHashMap[Path,
FileStatus] = {
+ if (cachedLeafFiles eq null) {
+ refresh()
+ }
cachedLeafFiles
}
override protected def leafDirToChildrenFiles: Map[Path,
Array[FileStatus]] = {
+ if (cachedLeafDirToChildrenFiles eq null) {
+ refresh()
--- End diff --
There is a side effect. `refresh()` rest the `cachedPartitionSpec` to null,
which may cleared already inferred partition information.
```
override def refresh(): Unit = {
val files = listLeafFiles(paths)
cachedLeafFiles =
new mutable.LinkedHashMap[Path, FileStatus]() ++= files.map(f =>
f.getPath -> f)
cachedLeafDirToChildrenFiles =
files.toArray.groupBy(_.getPath.getParent)
cachedPartitionSpec = null
}
```
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