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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
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  package org.apache.cassandra.index.sai.metrics;
  
  import org.junit.Test;
  
  import org.apache.cassandra.config.DatabaseDescriptor;
  
  import static org.junit.Assert.assertEquals;
  
  public class IndexSelectionTest extends AbstractMetricsTest
  {
      @Test
      public void shouldSelectLegacyIndexByDefault()
      {
          createTable("CREATE TABLE %s (pk int, ck int, val1 int, val2 int, PRIMARY KEY(pk, ck))");
          createIndex("CREATE INDEX ON %s(val1) USING 'legacy_local_table'");
          createIndex("CREATE INDEX ON %s(val1) USING 'sai'");
  
          execute("INSERT INTO %s(pk, ck, val1, val2) VALUES(?, ?, ?, ?)", 1, 1, 2, 1);
  
          assertRows(execute("SELECT pk, ck, val1, val2 FROM %s WHERE val1 = 2"), row(1, 1, 2, 1));
          assertEquals(0L, getTableQueryMetrics(KEYSPACE, currentTable(), "TotalQueriesCompleted"));
  
          DatabaseDescriptor.setPrioritizeSAIOverLegacyIndex(true);
          assertRows(execute("SELECT pk, ck, val1, val2 FROM %s WHERE val1 = 2"), row(1, 1, 2, 1));
          assertEquals(1L, getTableQueryMetrics(KEYSPACE, currentTable(), "TotalQueriesCompleted"));
  
          DatabaseDescriptor.setPrioritizeSAIOverLegacyIndex(false);
          assertRows(execute("SELECT pk, ck, val1, val2 FROM %s WHERE val1 = 2"), row(1, 1, 2, 1));
          assertEquals(1L, getTableQueryMetrics(KEYSPACE, currentTable(), "TotalQueriesCompleted"));
      }
  
      @Test
      public void shouldSelectLegacyIndexByDefaultForAndQueries()
      {
          createTable("CREATE TABLE %s (pk int, ck int, val1 int, val2 int, PRIMARY KEY(pk, ck))");
          createIndex("CREATE INDEX ON %s(val1) USING 'legacy_local_table'");
          createIndex("CREATE INDEX ON %s(val1) USING 'sai'");
          createIndex("CREATE INDEX ON %s(val2) USING 'legacy_local_table'");
          createIndex("CREATE INDEX ON %s(val2) USING 'sai'");
  
          execute("INSERT INTO %s(pk, ck, val1, val2) VALUES(?, ?, ?, ?)", 1, 1, 2, 1);
  
          assertRows(execute("SELECT pk, ck, val1, val2 FROM %s WHERE val1 = 2 AND val2 = 1"), row(1, 1, 2, 1));
          assertEquals(0L, getTableQueryMetrics(KEYSPACE, currentTable(), "TotalQueriesCompleted"));
  
          DatabaseDescriptor.setPrioritizeSAIOverLegacyIndex(true);
          assertRows(execute("SELECT pk, ck, val1, val2 FROM %s WHERE val1 = 2 AND val2 = 1"), row(1, 1, 2, 1));
          assertEquals(1L, getTableQueryMetrics(KEYSPACE, currentTable(), "TotalQueriesCompleted"));
  
          DatabaseDescriptor.setPrioritizeSAIOverLegacyIndex(false);
          assertRows(execute("SELECT pk, ck, val1, val2 FROM %s WHERE val1 = 2 AND val2 = 1"), row(1, 1, 2, 1));
          assertEquals(1L, getTableQueryMetrics(KEYSPACE, currentTable(), "TotalQueriesCompleted"));
      }
  }
  