cloud-fan commented on a change in pull request #29804:
URL: https://github.com/apache/spark/pull/29804#discussion_r493229395
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/DataSourceScanExec.scala
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@@ -348,20 +352,22 @@ case class FileSourceScanExec(
"DataFilters" -> seqToString(dataFilters),
"Location" -> locationDesc)
- val withSelectedBucketsCount = relation.bucketSpec.map { spec =>
- val numSelectedBuckets = optionalBucketSet.map { b =>
- b.cardinality()
- } getOrElse {
- spec.numBuckets
+ if (bucketedScan) {
+ relation.bucketSpec.map { spec =>
+ val numSelectedBuckets = optionalBucketSet.map { b =>
+ b.cardinality()
+ } getOrElse {
+ spec.numBuckets
+ }
+ metadata += ("SelectedBucketsCount" ->
+ (s"$numSelectedBuckets out of ${spec.numBuckets}" +
+ optionalNumCoalescedBuckets.map { b => s" (Coalesced to
$b)"}.getOrElse("")))
}
- metadata + ("SelectedBucketsCount" ->
- (s"$numSelectedBuckets out of ${spec.numBuckets}" +
- optionalNumCoalescedBuckets.map { b => s" (Coalesced to
$b)"}.getOrElse("")))
- } getOrElse {
- metadata
+ } else if (disableBucketedScan) {
+ metadata += ("DisableBucketedScan" -> "true")
Review comment:
Do we need it? It's kind of the reason why there is no bucket scan in
this node. The reason can be: 1. the table is not bucketed. 2. the bucket
column is not read. 3. the planner decides to disable it as it has no benefits.
If we do need the reason, we should make it completed. Let's not just put
the `disableBucketedScan` flag.
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