szehon-ho commented on code in PR #42757:
URL: https://github.com/apache/spark/pull/42757#discussion_r1312674140
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/BatchScanExec.scala:
##########
@@ -137,81 +136,63 @@ case class BatchScanExec(
outputPartitioning match {
case p: KeyGroupedPartitioning =>
- if (conf.v2BucketingPushPartValuesEnabled &&
- conf.v2BucketingPartiallyClusteredDistributionEnabled) {
- assert(filteredPartitions.forall(_.size == 1),
- "Expect partitions to be not grouped when " +
-
s"${SQLConf.V2_BUCKETING_PARTIALLY_CLUSTERED_DISTRIBUTION_ENABLED.key} " +
- "is enabled")
-
- val groupedPartitions =
groupPartitions(finalPartitions.map(_.head),
- groupSplits = true).get
-
- // This means the input partitions are not grouped by partition
values. We'll need to
- // check `groupByPartitionValues` and decide whether to group and
replicate splits
- // within a partition.
- if (spjParams.commonPartitionValues.isDefined &&
- spjParams.applyPartialClustering) {
- // A mapping from the common partition values to how many splits
the partition
- // should contain.
- val commonPartValuesMap = spjParams.commonPartitionValues
+ val groupedPartitions = filteredPartitions.map(splits => {
+ assert(splits.nonEmpty &&
splits.head.isInstanceOf[HasPartitionKey])
+ (splits.head.asInstanceOf[HasPartitionKey].partitionKey(), splits)
+ })
+
+ // This means the input partitions are not grouped by partition
values. We'll need to
Review Comment:
Nit: can we clarify 'this' `When partially-clustered, input partitions are
not grouped by partition values`
Nit: groupByPartitionValues seems never actually defined, can we fix it?
Does it refer to groupedPartitions?
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/physical/partitioning.scala:
##########
@@ -327,11 +327,14 @@ case class HashPartitioning(expressions: Seq[Expression],
numPartitions: Int)
* @param numPartitions the number of partitions
* @param partitionValues the values for the cluster keys of the distribution,
must be
Review Comment:
What do you think to add 'final cluster keys' to the javadoc , to make it
even more clear?
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/DataSourceV2ScanExecBase.scala:
##########
@@ -217,3 +210,19 @@ trait DataSourceV2ScanExecBase extends LeafExecNode {
}
}
}
+
+/**
+ * A key-grouped Spark partition, which could consist of multiple input splits
+ *
+ * @param value the partition value shared by all the input splits
+ * @param parts the input splits that are grouped into a single Spark partition
+ */
+private[v2] case class KeyGroupedPartition(value: InternalRow, parts:
Seq[InputPartition])
+
+/**
+ * Information about key-grouped partitions, which contains a list of grouped
partitions as well
+ * as the original input partitions before the grouping.
+ */
+private[v2] case class KeyGroupedPartitionInfo(
Review Comment:
It seems like it would refer to info about one KeyGroupedPartition. How
about KeyGroupedPartitionInfos ?
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