storage/HashTableFactory.cpp

/**
 * 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.
 **/

#include "storage/HashTableFactory.hpp"

#include <cstdio>
#include <string>
#include <vector>

#include "storage/HashTable.pb.h"
#include "types/Type.hpp"
#include "types/TypedValue.hpp"

#include "glog/logging.h"

namespace quickstep {

bool ValidateHashTableImplTypeString(const char *flagname,
                                     const std::string &value) {
  if ((value == "SeparateChaining") || (value == "LinearOpenAddressing")) {
    return true;
  } else {
    std::fprintf(stderr,
                 "--%s must be either SeparateChaining or LinearOpenAddressing\n",
                 flagname);
    return false;
  }
}

serialization::HashTableImplType HashTableImplTypeProtoFromString(
    const std::string &hash_table_impl_string) {
  if (hash_table_impl_string == "LinearOpenAddressing") {
    return serialization::HashTableImplType::LINEAR_OPEN_ADDRESSING;
  } else if (hash_table_impl_string == "SeparateChaining") {
    return serialization::HashTableImplType::SEPARATE_CHAINING;
  } else {
    LOG(FATAL) << "Unrecognized string for HashTable implementation type: "
               << hash_table_impl_string;
  }
}

serialization::HashTableImplType SimplifyHashTableImplTypeProto(
    const serialization::HashTableImplType proto_impl_type,
    const std::vector<const Type*> &key_types) {
  if ((proto_impl_type == serialization::HashTableImplType::SEPARATE_CHAINING)
      && (key_types.size() == 1)
      && (TypedValue::HashIsReversible(key_types.front()->getTypeID()))) {
    return serialization::HashTableImplType::SIMPLE_SCALAR_SEPARATE_CHAINING;
  } else {
    return proto_impl_type;
  }
}

}  // namespace quickstep