feat: support PartialMerge

Author: comphead

spark/src/main/scala/org/apache/spark/sql/comet/operators.scala

@@ -30,7 +30,7 @@ import org.apache.spark.broadcast.Broadcast
 import org.apache.spark.rdd.RDD
 import org.apache.spark.sql.catalyst.InternalRow
 import org.apache.spark.sql.catalyst.expressions.{Ascending, Attribute, AttributeSet, Expression, ExpressionSet, Generator, NamedExpression, SortOrder}
-import org.apache.spark.sql.catalyst.expressions.aggregate.{AggregateExpression, AggregateMode, CollectSet, Final, Partial, PartialMerge}
+import org.apache.spark.sql.catalyst.expressions.aggregate.{AggregateExpression, AggregateMode, CollectSet, Final, First, Last, Partial, PartialMerge}
 import org.apache.spark.sql.catalyst.optimizer.{BuildLeft, BuildRight, BuildSide}
 import org.apache.spark.sql.catalyst.plans._
 import org.apache.spark.sql.catalyst.plans.physical._
@@ -1470,7 +1470,7 @@ trait CometBaseAggregate {
         if (unsupportedAggs.nonEmpty) {
           withInfo(
             aggregate,
-            s"PartialMerge not supported for order-dependent aggregates: " +
+            "PartialMerge not supported for order-dependent aggregates: " +
               unsupportedAggs.map(_.aggregateFunction.prettyName).mkString(", "))
           return None
         }