111 lines
4.2 KiB
C++
111 lines
4.2 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_SQL_EXPR_LEAST_H_
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#define _OB_SQL_EXPR_LEAST_H_
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#include "sql/engine/expr/ob_expr_operator.h"
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namespace oceanbase {
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namespace sql {
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class ObExprBaseLeastGreatest : public ObMinMaxExprOperator {
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public:
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explicit ObExprBaseLeastGreatest(
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common::ObIAllocator& alloc, ObExprOperatorType type, const char* name, int32_t param_num);
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virtual ~ObExprBaseLeastGreatest();
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int calc_result_typeN_oracle(ObExprResType &type,
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ObExprResType *types_stack,
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int64_t param_num,
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common::ObExprTypeCtx &type_ctx) const;
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int calc_result_typeN_mysql(ObExprResType &type,
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ObExprResType *types_stack,
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int64_t param_num,
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common::ObExprTypeCtx &type_ctx) const;
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void set_param_type(const ObExprResType &type,
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ObExprResType *types,
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int64_t param_num) const;
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static int calc(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &expr_datum, bool least);
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// left < right: return true, else return false.
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static inline bool cmp_integer(const ObDatum &l_datum, const bool l_is_int,
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const ObDatum &r_datum, const bool r_is_int)
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{
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bool ret_bool = true;
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if (l_is_int && r_is_int) {
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ret_bool = l_datum.get_int() < r_datum.get_int();
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} else if (!l_is_int && !r_is_int) {
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ret_bool = l_datum.get_uint() < r_datum.get_uint();
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} else if (l_is_int && !r_is_int) {
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ret_bool = l_datum.get_int() < r_datum.get_uint();
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} else {
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ret_bool = l_datum.get_uint() < r_datum.get_int();
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}
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return ret_bool;
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}
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private:
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// disallow copy
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DISALLOW_COPY_AND_ASSIGN(ObExprBaseLeastGreatest);
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};
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class ObExprBaseLeast : public ObExprBaseLeastGreatest {
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public:
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explicit ObExprBaseLeast(common::ObIAllocator& alloc, int32_t param_num, ObExprOperatorType type = T_FUN_SYS_LEAST,
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const char* name = N_LEAST);
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virtual ~ObExprBaseLeast();
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virtual int calc_result_typeN(
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ObExprResType& type, ObExprResType* types_stack, int64_t param_num, common::ObExprTypeCtx& type_ctx) const override;
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virtual int calc_resultN(
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common::ObObj& result, const common::ObObj* objs_stack, int64_t param_num, common::ObExprCtx& expr_ctx) const override;
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virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
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static int calc_least(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
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private:
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// disallow copy
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DISALLOW_COPY_AND_ASSIGN(ObExprBaseLeast);
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};
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class ObExprLeastMySQL : public ObExprBaseLeast {
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public:
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explicit ObExprLeastMySQL(common::ObIAllocator& alloc);
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virtual ~ObExprLeastMySQL();
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virtual int calc_result_typeN(
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ObExprResType& type, ObExprResType* types_stack, int64_t param_num, common::ObExprTypeCtx& type_ctx) const;
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private:
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DISALLOW_COPY_AND_ASSIGN(ObExprLeastMySQL);
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};
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class ObExprLeastMySQLInner : public ObExprBaseLeast {
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public:
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explicit ObExprLeastMySQLInner(common::ObIAllocator& alloc);
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virtual ~ObExprLeastMySQLInner();
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virtual int calc_result_typeN(
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ObExprResType& type, ObExprResType* types_stack, int64_t param_num, common::ObExprTypeCtx& type_ctx) const;
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private:
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DISALLOW_COPY_AND_ASSIGN(ObExprLeastMySQLInner);
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};
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class ObExprOracleLeast : public ObExprBaseLeast {
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public:
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explicit ObExprOracleLeast(common::ObIAllocator& alloc);
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virtual ~ObExprOracleLeast();
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virtual int calc_result_typeN(
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ObExprResType& type, ObExprResType* types_stack, int64_t param_num, common::ObExprTypeCtx& type_ctx) const;
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private:
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DISALLOW_COPY_AND_ASSIGN(ObExprOracleLeast);
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};
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} // namespace sql
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} // namespace oceanbase
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#endif /* _OB_SQL_EXPR_LEAST_H_ */
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