59 lines
2.3 KiB
C++
59 lines
2.3 KiB
C++
/**
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* Copyright (c) 2021 OceanBase
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* OceanBase CE is licensed under Mulan PubL v2.
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* You can use this software according to the terms and conditions of the Mulan PubL v2.
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* You may obtain a copy of Mulan PubL v2 at:
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* http://license.coscl.org.cn/MulanPubL-2.0
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PubL v2 for more details.
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*/
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#ifndef _OB_EXPR_GET_SYS_VAR_H
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#define _OB_EXPR_GET_SYS_VAR_H 1
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#include "sql/engine/expr/ob_expr_operator.h"
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#include "sql/session/ob_sql_session_info.h"
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namespace oceanbase
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{
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namespace sql
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{
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// get_sys_var(name, scope)
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class ObExprGetSysVar: public ObFuncExprOperator
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{
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public:
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static const ObExprOperatorType op_type_;
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ObExprGetSysVar();
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explicit ObExprGetSysVar(common::ObIAllocator &alloc);
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virtual ~ObExprGetSysVar();
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virtual int calc_result_type2(ObExprResType &type,
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ObExprResType &type1,
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ObExprResType &type2,
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common::ObExprTypeCtx &type_ctx) const;
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// for engine 3.0
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virtual int cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr,
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ObExpr &rt_expr) const override;
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static int calc_get_sys_val_expr(const ObExpr &expr, ObEvalCtx &ctx,
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ObDatum &res_datum);
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private:
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static int calc_(common::ObObj &result, const common::ObString &var_name,
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const int64_t var_scope, ObSQLSessionInfo *session,
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ObExecContext *exec_ctx, common::ObIAllocator &alloc);
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static int get_session_var(common::ObObj &result, const common::ObString &var_name,
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common::ObIAllocator &alloc, ObSQLSessionInfo *session,
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ObExecContext *exec_ctx);
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static int get_sys_var_disp_obj(common::ObIAllocator &allocator,
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const ObSQLSessionInfo &session,
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const common::ObString &var_name,
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common::ObObj &disp_obj);
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private:
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// disallow copy
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DISALLOW_COPY_AND_ASSIGN(ObExprGetSysVar);
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};
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} // end namespace sql
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} // end namespace oceanbase
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#endif /* _OB_EXPR_GET_SYS_VAR_H */
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