cloud-fan commented on code in PR #47545:
URL: https://github.com/apache/spark/pull/47545#discussion_r1709471436
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/InsertMapSortInGroupingExpressions.scala:
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@@ -17,56 +17,85 @@
package org.apache.spark.sql.catalyst.optimizer
-import org.apache.spark.sql.catalyst.expressions.{ArrayTransform,
CreateNamedStruct, Expression, GetStructField, If, IsNull, LambdaFunction,
Literal, MapFromArrays, MapKeys, MapSort, MapValues, NamedLambdaVariable}
-import org.apache.spark.sql.catalyst.plans.logical.{Aggregate, LogicalPlan}
+import scala.collection.mutable
+
+import org.apache.spark.sql.catalyst.expressions.{Alias, ArrayTransform,
CreateNamedStruct, Expression, GetStructField, If, IsNull, LambdaFunction,
Literal, MapFromArrays, MapKeys, MapSort, MapValues, NamedExpression,
NamedLambdaVariable}
+import org.apache.spark.sql.catalyst.plans.logical.{Aggregate, LogicalPlan,
Project}
import org.apache.spark.sql.catalyst.rules.Rule
-import org.apache.spark.sql.catalyst.trees.TreePattern.AGGREGATE
+import org.apache.spark.sql.catalyst.trees.TreePattern
import org.apache.spark.sql.types.{ArrayType, MapType, StructType}
import org.apache.spark.util.ArrayImplicits.SparkArrayOps
/**
- * Adds MapSort to group expressions containing map columns, as the key/value
paris need to be
+ * Adds [[MapSort]] to group expressions containing map columns, as the
key/value paris need to be
* in the correct order before grouping:
- * SELECT COUNT(*) FROM TABLE GROUP BY map_column =>
- * SELECT COUNT(*) FROM TABLE GROUP BY map_sort(map_column)
+ *
+ * SELECT map_column, COUNT(*) FROM TABLE GROUP BY map_column =>
+ * SELECT _groupingexpression as map_column, COUNT(*) FROM (
+ * SELECT map_sort(map_column) as _groupingexpression FROM TABLE
+ * ) GROUP BY _groupingexpression
*/
object InsertMapSortInGroupingExpressions extends Rule[LogicalPlan] {
- override def apply(plan: LogicalPlan): LogicalPlan =
plan.transformWithPruning(
- _.containsPattern(AGGREGATE), ruleId) {
- case a @ Aggregate(groupingExpr, _, _) =>
- val newGrouping = groupingExpr.map { expr =>
- if (!expr.exists(_.isInstanceOf[MapSort])
- && expr.dataType.existsRecursively(_.isInstanceOf[MapType])) {
- insertMapSortRecursively(expr)
- } else {
- expr
+ private def shouldAddMapSort(expr: Expression): Boolean = {
+ expr.dataType.existsRecursively(_.isInstanceOf[MapType])
+ }
+
+ override def apply(plan: LogicalPlan): LogicalPlan = {
+ if (!plan.containsPattern(TreePattern.AGGREGATE)) {
+ return plan
+ }
+ val shouldRewrite = plan.exists {
+ case agg: Aggregate if agg.groupingExpressions.exists(shouldAddMapSort)
=> true
+ case _ => false
+ }
+ if (!shouldRewrite) {
+ return plan
+ }
+
+ plan transformUpWithNewOutput {
+ case agg @ Aggregate(groupingExpr, aggregateExpressions, child)
+ if agg.groupingExpressions.exists(shouldAddMapSort) =>
+ val exprToMapSort = new mutable.HashMap[Expression, NamedExpression]
Review Comment:
We can further simplify this rule if we run it after
`PullOutGroupingExpressions`. The group exprs will be Attribute
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