cloud-fan commented on code in PR #47026:
URL: https://github.com/apache/spark/pull/47026#discussion_r1664111018


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sql/core/src/main/scala/org/apache/spark/sql/scripting/SqlScriptingExecutionNode.scala:
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@@ -0,0 +1,147 @@
+/*
+ * 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.scripting
+
+import org.apache.spark.SparkException
+import org.apache.spark.internal.Logging
+import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan
+import org.apache.spark.sql.catalyst.trees.{Origin, WithOrigin}
+
+/**
+ * Trait for all SQL scripting execution nodes used during interpretation 
phase.
+ */
+sealed trait CompoundStatementExec extends Logging {
+
+  /**
+   * Whether the statement originates from the SQL script or is created during 
the interpretation.
+   * Example: DropVariable statements are automatically created at the end of 
each compound.
+   */
+  val isInternal: Boolean = false
+
+  /**
+   * Reset execution of the current node.
+   */
+  def reset(): Unit
+}
+
+/**
+ * Leaf node in the execution tree.
+ */
+trait LeafStatementExec extends CompoundStatementExec
+
+/**
+ * Non-leaf node in the execution tree. It is an iterator over executable 
child nodes.
+ */
+trait NonLeafStatementExec extends CompoundStatementExec with 
Iterator[CompoundStatementExec]
+
+/**
+ * Executable node for SingleStatement.
+ * @param parsedPlan
+ *   Logical plan of the parsed statement.
+ * @param origin
+ *   Origin descriptor for the statement.
+ * @param isInternal
+ *   Whether the statement originates from the SQL script or it is created 
during the
+ *   interpretation. Example: DropVariable statements are automatically 
created at the end of each
+ *   compound.
+ */
+class SingleStatementExec(
+    var parsedPlan: LogicalPlan,
+    override val origin: Origin,
+    override val isInternal: Boolean)
+  extends LeafStatementExec
+  with WithOrigin {
+
+  /**
+   * Whether this statement had to be executed during the interpretation phase.

Review Comment:
   do you mean `Whether this statement has been executed`?



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