Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/10799#discussion_r50031544
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/bucket.scala
---
@@ -57,15 +57,21 @@ 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 "_"
+ // * The other-information part may use `-` as separator and may
have numbers at the end,
+ // e.g. a normal parquet file without bucketing may have name:
+ // part-r-00000-2dd664f9-d2c4-4ffe-878f-431234567891.gz.parquet,
and we will mistakenly
+ // treat `431234567891` as bucket id. So here we pick `_` as
separator.
--- End diff --
@nongli can we just put bucket id at the beginning?
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