Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/10799#discussion_r49960929
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/bucket.scala
---
@@ -57,15 +57,17 @@ private[sql] abstract class BucketedOutputWriterFactory
extends OutputWriterFact
private[sql] object BucketingUtils {
// The file name of bucketed data should have 3 parts:
- // 1. some other information in the head of file name, ends with `-`
- // 2. bucket id part, some numbers
+ // 1. some other information in the head of file name
+ // 2. bucket id part, some numbers, starts with "_"
--- End diff --
Also explain why it needs to be `_` at here?
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