[GitHub] [spark] beliefer commented on a diff in pull request #42223: [SPARK-44571][SQL] Eliminate the Join by combine multiple Aggregates

["beliefer (via GitHub)" <gi...@apache.org>]

beliefer commented on code in PR #42223:
URL: https://github.com/apache/spark/pull/42223#discussion_r1280319320


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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/MergeScalarSubqueriesHelper.scala:
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@@ -0,0 +1,43 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.catalyst.optimizer
+
+import org.apache.spark.sql.catalyst.expressions.{Attribute, AttributeMap, Expression}
+import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan
+
+/**
+ * The helper class used to merge scalar subqueries.
+ */
+trait MergeScalarSubqueriesHelper {

Review Comment:
   @peter-toth I create this trait used to share the common functions.



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