huaxingao commented on a change in pull request #29695:
URL: https://github.com/apache/spark/pull/29695#discussion_r493151581
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/V2ScanRelationPushDown.scala
##########
@@ -17,38 +17,117 @@
package org.apache.spark.sql.execution.datasources.v2
-import org.apache.spark.sql.catalyst.expressions.{And, Expression,
NamedExpression, ProjectionOverSchema, SubqueryExpression}
+import scala.collection.mutable.ArrayBuilder
+
+import org.apache.spark.sql.catalyst.expressions._
+import org.apache.spark.sql.catalyst.expressions.aggregate.AggregateExpression
import org.apache.spark.sql.catalyst.planning.ScanOperation
-import org.apache.spark.sql.catalyst.plans.logical.{Filter, LogicalPlan,
Project}
+import org.apache.spark.sql.catalyst.plans.logical.{Aggregate, Filter,
LogicalPlan, Project}
import org.apache.spark.sql.catalyst.rules.Rule
-import org.apache.spark.sql.connector.read.{Scan, V1Scan}
+import org.apache.spark.sql.connector.read.{Scan, ScanBuilder, V1Scan}
import org.apache.spark.sql.execution.datasources.DataSourceStrategy
import org.apache.spark.sql.sources
+import org.apache.spark.sql.sources.{AggregateFunc, Aggregation}
import org.apache.spark.sql.types.StructType
object V2ScanRelationPushDown extends Rule[LogicalPlan] {
+
import DataSourceV2Implicits._
override def apply(plan: LogicalPlan): LogicalPlan = plan transformDown {
+ case Aggregate(groupingExpressions, resultExpressions, child) =>
+ child match {
+ case ScanOperation(project, filters, relation: DataSourceV2Relation) =>
+ val scanBuilder =
relation.table.asReadable.newScanBuilder(relation.options)
+ val aggregates = resultExpressions.flatMap { expr =>
+ expr.collect {
+ case agg: AggregateExpression => agg
+ }
+ }.distinct
+
+ val aggregation = PushDownUtils.pushAggregates(scanBuilder,
aggregates,
+ groupingExpressions)
+
+ val (pushedFilters, postScanFilters, scan, output,
normalizedProjects) =
+ processFilerAndColumn(scanBuilder, project, filters, relation)
+
+ logInfo(
+ s"""
+ |Pushing operators to ${relation.name}
+ |Pushed Filters: ${pushedFilters.mkString(", ")}
+ |Post-Scan Filters: ${postScanFilters.mkString(",")}
+ |Pushed Aggregate Functions:
${aggregation.aggregateExpressions.mkString(", ")}
+ |Pushed Groupby: ${aggregation.groupByExpressions.mkString(",
")}
+ |Output: ${output.mkString(", ")}
+ """.stripMargin)
+
+ val wrappedScan = scan match {
+ case v1: V1Scan =>
+ val translated =
filters.flatMap(DataSourceStrategy.translateFilter(_, true))
+ V1ScanWrapper(v1, translated, pushedFilters, aggregation)
+ case _ => scan
+ }
+
+ if (aggregation.aggregateExpressions.isEmpty) {
+ val plan = buildLogicalPlan(project, relation, wrappedScan,
output, normalizedProjects,
+ postScanFilters)
+ Aggregate(groupingExpressions, resultExpressions, plan)
+ } else {
+ val resultAttributes = resultExpressions.map(_.toAttribute)
+ .map ( e => e match { case a: AttributeReference => a })
+ var index = 0
+ val aggOutputBuilder = ArrayBuilder.make[AttributeReference]
+ for (a <- resultAttributes) {
+ aggOutputBuilder +=
+ a.copy(dataType = aggregates(index).dataType)(exprId =
NamedExpression.newExprId,
+ qualifier = a.qualifier)
+ index += 1
+ }
+ val aggOutput = aggOutputBuilder.result
+
+ var newOutput = aggOutput
+ for (col <- output) {
+ if (!aggOutput.exists(_.name.contains(col.name))) {
+ newOutput = col +: newOutput
+ }
+ }
+
+ val r = buildLogicalPlan(newOutput, relation, wrappedScan,
newOutput,
+ normalizedProjects, postScanFilters)
Review comment:
use the new output to build the plan.
e.g. original output, `JDBCScan$$anon$1@226de93c [ID#18]`, new output,
`JDBCScan$$anon$1@3f6f9cef [max(ID)#77,min(ID)#78]`
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