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src/sql/engine/expr/ob_expr_userenv.h Normal file
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/**
* 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 SRC_SQL_ENGINE_EXPR_OB_EXPR_USERENV_H_
#define SRC_SQL_ENGINE_EXPR_OB_EXPR_USERENV_H_
#include "sql/engine/expr/ob_expr_operator.h"
#include "lib/container/ob_iarray.h"
namespace oceanbase {
namespace sql {
class ObExprUserEnv : public ObFuncExprOperator {
public:
ObExprUserEnv();
explicit ObExprUserEnv(common::ObIAllocator& alloc);
virtual ~ObExprUserEnv();
virtual int calc_result_type1(ObExprResType& type, ObExprResType& arg1, common::ObExprTypeCtx& type_ctx,
common::ObIArray<common::ObObj*>& arg_arrs) const override;
virtual int calc_result1(
common::ObObj& result, const common::ObObj& arg1, common::ObExprCtx& expr_ctx) const override;
struct UserEnvParameter {
char name[10];
bool is_str;
int (*calc)(common::ObObj& result, const common::ObObj& arg1, common::ObExprCtx& expr_ctx);
// engine 3.0
int (*eval)(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res);
};
static int calc_schemaid_result1(common::ObObj& result, const common::ObObj& arg1, common::ObExprCtx& expr_ctx);
static int calc_sessionid_result1(common::ObObj& result, const common::ObObj& arg1, common::ObExprCtx& expr_ctx);
// engine 3.0
virtual int cg_expr(ObExprCGCtx& ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
static int calc_user_env_expr(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res);
static int eval_schemaid_result1(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res);
static int eval_sessionid_result1(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res);
private:
int check_arg_valid(const common::ObObj& value, UserEnvParameter& para) const;
static UserEnvParameter parameters_[];
static const int DEFAULT_LENGTH = 64;
DISALLOW_COPY_AND_ASSIGN(ObExprUserEnv);
};
} // end namespace sql
} // end namespace oceanbase
#endif