Add GeneratorSuite.

sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/GeneratorSuite.scala

@@ -0,0 +1,63 @@
+/*
+ * 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.expressions
+
+import org.apache.spark.SparkFunSuite
+import org.apache.spark.sql.catalyst.InternalRow
+import org.apache.spark.unsafe.types.UTF8String
+
+class GeneratorSuite extends SparkFunSuite with ExpressionEvalHelper {
+  private def checkTuple(actual: ExplodeBase, expected: Seq[InternalRow]): Unit = {
+    assert(actual.eval(null).toSeq === expected)
+  }
+
+  private final val int_array = Seq(1, 2, 3)
+  private final val str_array = Seq("a", "b", "c")
+
+  test("explode") {
+    val int_correct_answer = Seq(Seq(1), Seq(2), Seq(3))
+    val str_correct_answer = Seq(
+      Seq(UTF8String.fromString("a")),
+      Seq(UTF8String.fromString("b")),
+      Seq(UTF8String.fromString("c")))
+
+    checkTuple(
+      Explode(CreateArray(int_array.map(Literal(_)))),
+      int_correct_answer.map(InternalRow.fromSeq(_)))
+
+    checkTuple(
+      Explode(CreateArray(str_array.map(Literal(_)))),
+      str_correct_answer.map(InternalRow.fromSeq(_)))
+  }
+
+  test("posexplode") {
+    val int_correct_answer = Seq(Seq(0, 1), Seq(1, 2), Seq(2, 3))
+    val str_correct_answer = Seq(
+      Seq(0, UTF8String.fromString("a")),
+      Seq(1, UTF8String.fromString("b")),
+      Seq(2, UTF8String.fromString("c")))
+
+    checkTuple(
+      PosExplode(CreateArray(int_array.map(Literal(_)))),
+      int_correct_answer.map(InternalRow.fromSeq(_)))
+
+    checkTuple(
+      PosExplode(CreateArray(str_array.map(Literal(_)))),
+      str_correct_answer.map(InternalRow.fromSeq(_)))
+  }
+}