Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/23130#discussion_r236226380
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/DataSourceScanExec.scala
---
@@ -388,7 +388,7 @@ case class FileSourceScanExec(
logInfo(s"Planning with ${bucketSpec.numBuckets} buckets")
val filesGroupedToBuckets =
selectedPartitions.flatMap { p =>
- p.files.map { f =>
+ p.files.filter(_.getLen > 0).map { f =>
--- End diff --
I personally prefer filter + map as it's shorter and clearer. I don't know
if one is faster; two transformations vs having to return Some/None. For a
Dataset operation I'd favor one operation, but this is just local Scala code.
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