fuwhu commented on a change in pull request #26805: [SPARK-15616][SQL] Add
optimizer rule PruneHiveTablePartitions
URL: https://github.com/apache/spark/pull/26805#discussion_r363016643
##########
File path:
sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveStrategies.scala
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@@ -150,6 +151,100 @@ class DetermineTableStats(session: SparkSession) extends
Rule[LogicalPlan] {
}
}
+/**
+ * TODO: merge this with PruneFileSourcePartitions after we completely make
hive as a data source.
+ */
+case class PruneHiveTablePartitions(session: SparkSession)
+ extends Rule[LogicalPlan] with PredicateHelper {
+ /**
+ * Extract the partition filters from the filters on the table.
+ */
+ private def extractPartitionPruningFilters(filters: Seq[Expression],
+ relation: HiveTableRelation):
Seq[Expression] = {
+ val normalizedFilters = filters.map { e =>
+ e transform {
+ case a: AttributeReference =>
+ a.withName(relation.output.find(_.semanticEquals(a)).get.name)
+ }
+ }
+ val partitionSet = AttributeSet(relation.partitionCols)
+ normalizedFilters.filter { predicate =>
+ !predicate.references.isEmpty &&
predicate.references.subsetOf(partitionSet)
+ }
+ }
+
+ /**
+ * Prune the hive table using filters on the partitions of the table,
+ * and also update the statistics of the table.
+ */
+ private def prunedHiveTableWithStats(relation: HiveTableRelation,
+ partitionFilters: Seq[Expression]):
HiveTableRelation = {
+ val conf = session.sessionState.conf
+ val prunedPartitions =
session.sharedState.externalCatalog.listPartitionsByFilter(
+ relation.tableMeta.database,
+ relation.tableMeta.identifier.table,
+ partitionFilters,
+ conf.sessionLocalTimeZone)
+ val sizeInBytes = try {
+ val partitionsWithSize = prunedPartitions.map { part =>
+ val rawDataSize =
part.parameters.get(StatsSetupConst.RAW_DATA_SIZE).map(_.toLong)
+ val totalSize =
part.parameters.get(StatsSetupConst.TOTAL_SIZE).map(_.toLong)
+ if (rawDataSize.isDefined && rawDataSize.get > 0) {
+ (part, rawDataSize.get)
+ } else if (totalSize.isDefined && totalSize.get > 0L) {
+ (part, totalSize.get)
+ } else {
+ (part, 0L)
+ }
+ }
+ val sizeOfPartitions =
Review comment:
DetermineTableStats is Analyzer rule, while the pruned partitions and the
size of them must be calculated
after filter push-down optimizers executed. So we can not put this part in
DetermineTableStats now.
But I will check whether the DetermineTableStats can be moved to
optimization phase and put after PruneHiveTablePartitions. If any
idea/suggestion, please share. thanks.
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