content: /*
   * 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.cassandra.index.sai.cql;
  
  import java.nio.ByteBuffer;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.junit.Test;
  
  import org.apache.cassandra.Util;
  import org.apache.cassandra.index.sai.SAITester;
  import org.apache.cassandra.utils.ByteBufferUtil;
  
  import static org.junit.Assert.assertEquals;
  
  public class TokenCollisionTest extends SAITester
  {
      @Test
      public void skinnyPartitionTest()
      {
          doSkinnyPartitionTest(10, 0);
      }
  
      @Test
      public void skinnyPartitionLastRowTest()
      {
          doSkinnyPartitionTest(49, 9);
      }
  
      private void doSkinnyPartitionTest(int v1Match, int v2Match)
      {
          createTable("CREATE TABLE %s (pk blob, v1 int, v2 int, PRIMARY KEY (pk))");
          createIndex("CREATE INDEX ON %s(v1) USING 'sai'");
          createIndex("CREATE INDEX ON %s(v2) USING 'sai'");
  
          ByteBuffer prefix = ByteBufferUtil.bytes("key");
          int numRows = 100;
          int v1Count = 0;
          int v2Count = 0;
          List<Object[]> matchingPks = new ArrayList<>();
          for (int pkCount = 0; pkCount < numRows; pkCount++)
          {
              ByteBuffer pk = Util.generateMurmurCollision(prefix, (byte) (pkCount / 64), (byte) (pkCount % 64));
              if (v1Count == v1Match && v2Count == v2Match)
                  matchingPks.add(row(pk, v1Count, v2Count));
              execute("INSERT INTO %s (pk, v1, v2) VALUES (?, ?, ?)", pk, v1Count++, v2Count++);
              if (v1Count == 50)
                  v1Count = 0;
              if (v2Count == 10)
                  v2Count = 0;
          }
          assertEquals(2, matchingPks.size());
          flush();
  
          assertRowsIgnoringOrder(execute("SELECT * FROM %s WHERE v1=" + v1Match + " AND v2=" + v2Match), matchingPks.get(0), matchingPks.get(1));
      }
  
      @Test
      public void widePartitionTest()
      {
          doWidePartitionTest(100, 10, 0);
      }
  
      @Test
      public void widePartitionLastRowTest()
      {
          // Reduce the number of rows so the last row occurs at the first clustering value
          doWidePartitionTest(97, 46, 6);
      }
  
      private void doWidePartitionTest(int numRows, int v1Match, int v2Match)
      {
          createTable("CREATE TABLE %s (pk blob, ck int, v1 int, v2 int, PRIMARY KEY (pk, ck))");
          createIndex("CREATE INDEX ON %s(v1) USING 'sai'");
          createIndex("CREATE INDEX ON %s(v2) USING 'sai'");
  
          ByteBuffer prefix = ByteBufferUtil.bytes("key");
          int pkCount = 0;
          int ckCount = 0;
          int v1Count = 0;
          int v2Count = 0;
          List<Object[]> matchingRows = new ArrayList<>();
          for (int i = 0; i < numRows; i++)
          {
              ByteBuffer pk = Util.generateMurmurCollision(prefix, (byte) (pkCount / 64), (byte) (pkCount % 64));
              if (v1Count == v1Match && v2Count == v2Match)
                  matchingRows.add(row(pk, ckCount, v1Count, v2Count));
              execute("INSERT INTO %s (pk, ck, v1, v2) VALUES (?, ?, ?, ?)", pk, ckCount++, v1Count++, v2Count++);
              if (ckCount == 8)
              {
                  ckCount = 0;
                  pkCount++;
              }
              if (v1Count == 50)
                  v1Count = 0;
              if (v2Count == 10)
                  v2Count = 0;
          }
          assertEquals(2, matchingRows.size());
          flush();
  
          assertRowsIgnoringOrder(execute("SELECT * FROM %s WHERE v1=" + v1Match + " AND v2=" + v2Match), matchingRows.get(0), matchingRows.get(1));
      }
  }
  