/**
 * Copyright (c) 2021 OceanBase
 * OceanBase CE is licensed under Mulan PubL v2.
 * You can use this software according to the terms and conditions of the Mulan PubL v2.
 * You may obtain a copy of Mulan PubL v2 at:
 *          http://license.coscl.org.cn/MulanPubL-2.0
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PubL v2 for more details.
 */

#ifndef OCEANBASE_OB_SQL_EXPR_CASE_H_
#define OCEANBASE_OB_SQL_EXPR_CASE_H_

#include "sql/engine/expr/ob_expr_operator.h"

namespace oceanbase
{
namespace sql
{

#define CHECK_WHEN_EXPR_TYPE (1ULL)
#define NEED_CHECK_WHEN_EXPR_TYPE(flag) (((flag) & CHECK_WHEN_EXPR_TYPE) != 0)

class ObExprCase : public ObExprOperator
{
public:
  explicit  ObExprCase(common::ObIAllocator &alloc);
  virtual ~ObExprCase();

  virtual int calc_result_typeN(ObExprResType &type,
                                ObExprResType *types_stack,
                                int64_t param_num,
                                common::ObExprTypeCtx &type_ctx) const;
  static int calc_case_expr(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res_datum);
  virtual int cg_expr(ObExprCGCtx &op_cg_ctx,
                      const ObRawExpr &raw_expr,
                      ObExpr &rt_expr) const override;
  static int is_same_kind_type_for_case(const common::ObIArray<ObExprResType> &type_arr);
  static int eval_case_batch(const ObExpr &expr,
                             ObEvalCtx &ctx,
                             const ObBitVector &skip,
                             const int64_t batch_size);
private:
  // disallow copy
  DISALLOW_COPY_AND_ASSIGN(ObExprCase);
};
}
}
#endif // OCEANBASE_OB_SQL_EXPR_CASE_H_