Added a test case.

Author: rxin

sql/core/src/test/scala/org/apache/spark/sql/execution/joins/HashedRelationSuite.scala

@@ -0,0 +1,60 @@
+/*
+ * 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.execution.joins
+
+import org.scalatest.FunSuite
+
+import org.apache.spark.sql.catalyst.expressions.{Projection, Row}
+import org.apache.spark.util.collection.CompactBuffer
+
+
+class HashedRelationSuite extends FunSuite {
+
+  // Key is simply the record itself
+  private val keyProjection = new Projection {
+    override def apply(row: Row): Row = row
+  }
+
+  test("GeneralHashedRelation") {
+    val data = Array(Row(0), Row(1), Row(2), Row(2))
+    val hashed = HashedRelation(data.iterator, keyProjection)
+    assert(hashed.isInstanceOf[GeneralHashedRelation])
+
+    assert(hashed.get(data(0)) == CompactBuffer[Row](data(0)))
+    assert(hashed.get(data(1)) == CompactBuffer[Row](data(1)))
+
+    val data2 = CompactBuffer[Row](data(2))
+    data2 += data(2)
+    assert(hashed.get(data(2)) == data2)
+  }
+
+  test("UniqueKeyHashedRelation") {
+    val data = Array(Row(0), Row(1), Row(2))
+    val hashed = HashedRelation(data.iterator, keyProjection)
+    assert(hashed.isInstanceOf[UniqueKeyHashedRelation])
+
+    assert(hashed.get(data(0)) == CompactBuffer[Row](data(0)))
+    assert(hashed.get(data(1)) == CompactBuffer[Row](data(1)))
+    assert(hashed.get(data(2)) == CompactBuffer[Row](data(2)))
+
+    val uniqHashed = hashed.asInstanceOf[UniqueKeyHashedRelation]
+    assert(uniqHashed.getValue(data(0)) == data(0))
+    assert(uniqHashed.getValue(data(1)) == data(1))
+    assert(uniqHashed.getValue(data(2)) == data(2))
+  }
+}