[HUDI-1883] Support Truncate Table For Hoodie (#3098)

hudi-spark-datasource/hudi-spark/src/test/scala/org/apache/spark/sql/hudi/TestTruncateTable.scala

@@ -0,0 +1,54 @@
+/*
+ * 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.hudi
+
+class TestTruncateTable extends TestHoodieSqlBase {
+
+  test("Test Truncate Table") {
+    Seq("cow", "mor").foreach { tableType =>
+      val tableName = generateTableName
+      // Create table
+      spark.sql(
+        s"""
+            |create table $tableName (
+            |  id int,
+            |  name string,
+            |  price double,
+            |  ts long
+            |) using hudi
+            | options (
+            |  type = '$tableType',
+            |  primaryKey = 'id',
+            |  preCombineField = 'ts'
+            | )
+       """.stripMargin)
+      // Insert data
+      spark.sql(s"insert into $tableName values(1, 'a1', 10, 1000)")
+      // Truncate table
+      spark.sql(s"truncate table $tableName")
+      checkAnswer(s"select count(1) from $tableName")(Seq(0))
+
+      // Insert data to the truncated table.
+      spark.sql(s"insert into $tableName values(1, 'a1', 10, 1000)")
+      checkAnswer(s"select id, name, price, ts from $tableName")(
+        Seq(1, "a1", 10.0, 1000)
+      )
+    }
+  }
+}