147 lines
4.4 KiB
C++
147 lines
4.4 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 OCEANBASE_SQL_OB_EXPR_COLLATION_H_
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#define OCEANBASE_SQL_OB_EXPR_COLLATION_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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/// Returns the character set of the string argument.
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class ObExprCharset: public ObStringExprOperator
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{
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public:
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//ObExprCharset();
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explicit ObExprCharset(common::ObIAllocator &alloc);
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virtual ~ObExprCharset();
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virtual int calc_result_type1(ObExprResType &type,
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ObExprResType &type1,
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common::ObExprTypeCtx &type_ctx) const;
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virtual int cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr,
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ObExpr &rt_expr) const;
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private:
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// types and constants
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private:
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// disallow copy
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DISALLOW_COPY_AND_ASSIGN(ObExprCharset);
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// function members
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private:
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// data members
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};
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/// Returns the collation of the string argument.
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class ObExprCollation: public ObStringExprOperator
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{
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public:
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//ObExprCollation();
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explicit ObExprCollation(common::ObIAllocator &alloc);
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virtual ~ObExprCollation();
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virtual int calc_result_type1(ObExprResType &type,
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ObExprResType &type1,
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common::ObExprTypeCtx &type_ctx) const;
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virtual int cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr,
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ObExpr &rt_expr) const;
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private:
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// types and constants
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private:
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// disallow copy
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DISALLOW_COPY_AND_ASSIGN(ObExprCollation);
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// function members
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private:
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// data members
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};
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/// Returns the collation coercibility value of the string argument.
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/// @see ObCollationLevel
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class ObExprCoercibility: public ObExprOperator
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{
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public:
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//ObExprCoercibility();
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explicit ObExprCoercibility(common::ObIAllocator &alloc);
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virtual ~ObExprCoercibility();
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virtual int calc_result_type1(ObExprResType &type,
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ObExprResType &type1,
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common::ObExprTypeCtx &type_ctx) const;
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virtual int cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr,
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ObExpr &rt_expr) const;
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private:
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// types and constants
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private:
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// disallow copy
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DISALLOW_COPY_AND_ASSIGN(ObExprCoercibility);
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// function members
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private:
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// data members
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};
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/// change collation of the input argument
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/// used to implement COLLATE clause, e.g. C1 collate utf8_general_ci, 'abc' collate utf8_bin
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/// format: SET_COLLATION(expr, utf8_general_ci)
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class ObExprSetCollation: public ObExprOperator
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{
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public:
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//ObExprSetCollation();
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explicit ObExprSetCollation(common::ObIAllocator &alloc);
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virtual ~ObExprSetCollation();
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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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virtual int cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr,
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ObExpr &rt_expr) const;
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private:
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// types and constants
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private:
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// disallow copy
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DISALLOW_COPY_AND_ASSIGN(ObExprSetCollation);
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// function members
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private:
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// data members
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};
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/// Returns the meta used for comparison
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/// @note for debug purpose
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class ObExprCmpMeta: public ObStringExprOperator
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{
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public:
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//ObExprCmpMeta();
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explicit ObExprCmpMeta(common::ObIAllocator &alloc);
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virtual ~ObExprCmpMeta();
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virtual int calc_result_type1(ObExprResType &type,
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ObExprResType &type1,
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common::ObExprTypeCtx &type_ctx) const;
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virtual int cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr,
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ObExpr &rt_expr) const;
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private:
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// types and constants
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private:
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// disallow copy
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DISALLOW_COPY_AND_ASSIGN(ObExprCmpMeta);
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// function members
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private:
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// data members
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};
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} // end namespace sql
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} // end namespace oceanbase
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#endif //OCEANBASE_SQL_OB_EXPR_COLLATION_H_
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