Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/11999#discussion_r57605486
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/sources/interfaces.scala ---
@@ -549,15 +549,18 @@ class HDFSFileCatalog(
refresh()
+ private def isInvalidFile(f: FileStatus): Boolean =
+ f.getPath.getName.startsWith("_") || f.getLen == 0
--- End diff --
Yeah, that assert is my fault (from when I though my bin packing algorithm
had a bug). We should support reading empty files (if thats valid for the
format) and we should avoid writing them when possible.
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