import quincy 17.2.0

[ceph.git] / ceph / src / arrow / java / algorithm / src / test / java / org / apache / arrow / algorithm / sort / TestStableVectorComparator.java

diff --git a/ceph/src/arrow/java/algorithm/src/test/java/org/apache/arrow/algorithm/sort/TestStableVectorComparator.java b/ceph/src/arrow/java/algorithm/src/test/java/org/apache/arrow/algorithm/sort/TestStableVectorComparator.java
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+++ b/ceph/src/arrow/java/algorithm/src/test/java/org/apache/arrow/algorithm/sort/TestStableVectorComparator.java
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+/*
+ * 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.arrow.algorithm.sort;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.apache.arrow.memory.BufferAllocator;
+import org.apache.arrow.memory.RootAllocator;
+import org.apache.arrow.vector.VarCharVector;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+/**
+ * Test cases for {@link StableVectorComparator}.
+ */
+public class TestStableVectorComparator {
+
+  private BufferAllocator allocator;
+
+  @Before
+  public void prepare() {
+    allocator = new RootAllocator(1024 * 1024);
+  }
+
+  @After
+  public void shutdown() {
+    allocator.close();
+  }
+
+  @Test
+  public void testCompare() {
+    try (VarCharVector vec = new VarCharVector("", allocator)) {
+      vec.allocateNew(100, 5);
+      vec.setValueCount(10);
+
+      // fill data to sort
+      vec.set(0, "ba".getBytes());
+      vec.set(1, "abc".getBytes());
+      vec.set(2, "aa".getBytes());
+      vec.set(3, "abc".getBytes());
+      vec.set(4, "a".getBytes());
+
+      VectorValueComparator<VarCharVector> comparator = new TestVarCharSorter();
+      VectorValueComparator<VarCharVector> stableComparator = new StableVectorComparator<>(comparator);
+      stableComparator.attachVector(vec);
+
+      assertTrue(stableComparator.compare(0, 1) > 0);
+      assertTrue(stableComparator.compare(1, 2) < 0);
+      assertTrue(stableComparator.compare(2, 3) < 0);
+      assertTrue(stableComparator.compare(1, 3) < 0);
+      assertTrue(stableComparator.compare(3, 1) > 0);
+      assertTrue(stableComparator.compare(3, 3) == 0);
+    }
+  }
+
+  @Test
+  public void testStableSortString() {
+    try (VarCharVector vec = new VarCharVector("", allocator)) {
+      vec.allocateNew(100, 10);
+      vec.setValueCount(10);
+
+      // fill data to sort
+      vec.set(0, "a".getBytes());
+      vec.set(1, "abc".getBytes());
+      vec.set(2, "aa".getBytes());
+      vec.set(3, "a1".getBytes());
+      vec.set(4, "abcdefg".getBytes());
+      vec.set(5, "accc".getBytes());
+      vec.set(6, "afds".getBytes());
+      vec.set(7, "0".getBytes());
+      vec.set(8, "01".getBytes());
+      vec.set(9, "0c".getBytes());
+
+      // sort the vector
+      VariableWidthOutOfPlaceVectorSorter sorter = new VariableWidthOutOfPlaceVectorSorter();
+      VectorValueComparator<VarCharVector> comparator = new TestVarCharSorter();
+      VectorValueComparator<VarCharVector> stableComparator = new StableVectorComparator<>(comparator);
+
+      try (VarCharVector sortedVec =
+              (VarCharVector) vec.getField().getFieldType().createNewSingleVector("", allocator, null)) {
+        sortedVec.allocateNew(vec.getByteCapacity(), vec.getValueCount());
+        sortedVec.setLastSet(vec.getValueCount() - 1);
+        sortedVec.setValueCount(vec.getValueCount());
+
+        sorter.sortOutOfPlace(vec, sortedVec, stableComparator);
+
+        // verify results
+        // the results are stable
+        assertEquals("0", new String(sortedVec.get(0)));
+        assertEquals("01", new String(sortedVec.get(1)));
+        assertEquals("0c", new String(sortedVec.get(2)));
+        assertEquals("a", new String(sortedVec.get(3)));
+        assertEquals("abc", new String(sortedVec.get(4)));
+        assertEquals("aa", new String(sortedVec.get(5)));
+        assertEquals("a1", new String(sortedVec.get(6)));
+        assertEquals("abcdefg", new String(sortedVec.get(7)));
+        assertEquals("accc", new String(sortedVec.get(8)));
+        assertEquals("afds", new String(sortedVec.get(9)));
+      }
+    }
+  }
+
+  /**
+   * Utility comparator that compares varchars by the first character.
+   */
+  private static class TestVarCharSorter extends VectorValueComparator<VarCharVector> {
+
+    @Override
+    public int compareNotNull(int index1, int index2) {
+      byte b1 = vector1.get(index1)[0];
+      byte b2 = vector2.get(index2)[0];
+      return b1 - b2;
+    }
+
+    @Override
+    public VectorValueComparator<VarCharVector> createNew() {
+      return new TestVarCharSorter();
+    }
+  }
+}