/**
 * 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.
 **/

#ifndef QUICKSTEP_QUERY_OPTIMIZER_EXPRESSIONS_EXPRESSION_TYPE_HPP_
#define QUICKSTEP_QUERY_OPTIMIZER_EXPRESSIONS_EXPRESSION_TYPE_HPP_

namespace quickstep {
namespace optimizer {
namespace expressions {

/** \addtogroup OptimizerExpressions
 *  @{
 */

/**
 * @brief Optimizer expression types.
 **/
enum class ExpressionType {
  kAggregateFunction = 0,
  kAlias,
  kAttributeReference,
  kBinaryExpression,
  kCast,
  kCommonSubexpression,
  kComparisonExpression,
  kExists,
  kInTableQuery,
  kInValueList,
  kLogicalAnd,
  kLogicalOr,
  kLogicalNot,
  kPredicateLiteral,
  kScalarLiteral,
  kSearchedCase,
  kSimpleCase,
  kSubqueryExpression,
  kUnaryExpression,
  kWindowAggregateFunction
};

/** @} */

}  // namespace expressions
}  // namespace optimizer
}  // namespace quickstep

#endif /* QUICKSTEP_QUERY_OPTIMIZER_EXPRESSIONS_EXPRESSION_TYPE_HPP_ */