Parallel fragment exec instance (#851)

fe/src/test/java/org/apache/doris/common/util/ListUtilTest.java

@@ -0,0 +1,101 @@
+// 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.doris.common.util;
+
+import com.google.common.collect.Lists;
+import org.junit.Assert;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+
+import java.util.List;
+
+public class ListUtilTest {
+
+    @Rule
+    public ExpectedException expectedEx = ExpectedException.none();
+
+    @Test
+    public void testSplitBySizeNormal() {
+        List<Integer> lists = Lists.newArrayList(1, 2, 3, 4, 5, 6, 7);
+        int expectSize = 3;
+
+        List<List<Integer>> splitLists = ListUtil.splitBySize(lists, expectSize);
+
+        Assert.assertEquals(splitLists.size(), 3);
+        Assert.assertEquals(splitLists.get(0).size(), 3);
+        Assert.assertEquals(splitLists.get(1).size(), 2);
+        Assert.assertEquals(splitLists.get(2).size(), 2);
+    }
+
+    @Test
+    public void testSplitBySizeNormal2() {
+        List<Integer> lists = Lists.newArrayList(1, 2, 3, 4, 5, 6, 7);
+        int expectSize = 1;
+
+        List<List<Integer>> splitLists = ListUtil.splitBySize(lists, expectSize);
+
+        Assert.assertEquals(splitLists.size(), 1);
+        Assert.assertEquals(lists, splitLists.get(0));
+    }
+
+    @Test
+    public void testSplitBySizeWithLargeExpectSize() {
+        List<Integer> lists = Lists.newArrayList(1, 2, 3);
+        int expectSize = 10;
+
+        List<List<Integer>> splitLists = ListUtil.splitBySize(lists, expectSize);
+
+        Assert.assertEquals(splitLists.size(), lists.size());
+        Assert.assertTrue( splitLists.get(0).get(0) == 1);
+        Assert.assertTrue( splitLists.get(1).get(0) == 2);
+        Assert.assertTrue( splitLists.get(2).get(0) == 3);
+    }
+
+    @Test
+    public void testSplitBySizeWithEmptyList() {
+        List<Integer> lists = Lists.newArrayList();
+        int expectSize = 10;
+
+        List<List<Integer>> splitLists = ListUtil.splitBySize(lists, expectSize);
+
+        Assert.assertEquals(splitLists.size(), lists.size());
+    }
+
+    @Test
+    public void testSplitBySizeWithNullList() {
+        List<Integer> lists = null;
+        int expectSize = 10;
+
+        expectedEx.expect(NullPointerException.class);
+        expectedEx.expectMessage("list must not be null");
+
+        ListUtil.splitBySize(lists, expectSize);
+    }
+
+    @Test
+    public void testSplitBySizeWithNegativeSize() {
+        List<Integer> lists = Lists.newArrayList(1, 2, 3);
+        int expectSize = -1;
+
+        expectedEx.expect(IllegalArgumentException.class);
+        expectedEx.expectMessage("expectedSize must larger than 0");
+
+        ListUtil.splitBySize(lists, expectSize);
+    }
+}