90 lines
3.3 KiB
C++
90 lines
3.3 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_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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{
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namespace sql
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{
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class ObExprLeastGreatest : public ObMinMaxExprOperator
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{
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public:
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explicit ObExprLeastGreatest(common::ObIAllocator &alloc, ObExprOperatorType type,
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const char *name, int32_t param_num);
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virtual ~ObExprLeastGreatest() {}
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virtual int calc_result_typeN(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_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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virtual int cg_expr(ObExprCGCtx &op_cg_ctx,
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const ObRawExpr &raw_expr,
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ObExpr &rt_expr) const override;
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static int cast_param(const ObExpr &src_expr, ObEvalCtx &ctx,
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const ObDatumMeta &dst_meta,
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const ObCastMode &cm, ObIAllocator &allocator,
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ObDatum &res_datum);
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static int cast_result(const ObExpr &src_expr, const ObExpr &dst_expr, ObEvalCtx &ctx,
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const ObCastMode &cm,
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ObDatum &expr_datum);
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static int calc_mysql(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &expr_datum, bool least);
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static int calc_oracle(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(ObExprLeastGreatest);
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};
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class ObExprLeast : public ObExprLeastGreatest
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{
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public:
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explicit ObExprLeast(common::ObIAllocator &alloc);
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virtual ~ObExprLeast() {}
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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(ObExprLeast);
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};
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}
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}
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#endif /* _OB_SQL_EXPR_LEAST_H_ */
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