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oceanbase-admin
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src/sql/engine/expr/ob_expr_trim.h
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146
src/sql/engine/expr/ob_expr_trim.h
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/**
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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_TRIM_H_
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#define _OB_SQL_EXPR_TRIM_H_
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#include "sql/engine/expr/ob_expr_operator.h"
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namespace oceanbase {
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namespace common {
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class ObExprTypeCtx;
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class ObExprCtx;
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} // namespace common
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namespace sql {
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class ObExprTrim : public ObStringExprOperator {
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public:
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enum TrimType { TYPE_LRTRIM = 0, TYPE_LTRIM = 1, TYPE_RTRIM = 2 };
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explicit ObExprTrim(common::ObIAllocator& alloc);
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explicit ObExprTrim(common::ObIAllocator& alloc, ObExprOperatorType type, const char* name, int32_t param_num);
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virtual ~ObExprTrim();
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static int calc(common::ObObj& result, const int64_t trim_type, const common::ObString& trim_pattern,
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const common::ObString& text, const common::ObObjType& res_type, common::ObExprCtx& expr_ctx);
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static int trim(common::ObString& result, const int64_t trim_type, const common::ObString& trim_pattern,
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const common::ObString& text);
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static int trim2(common::ObString& result, const int64_t trim_type, const common::ObString& trim_pattern,
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const common::ObString& text, const common::ObCollationType& cs_type,
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const common::ObFixedArray<size_t, common::ObIAllocator>&,
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const common::ObFixedArray<size_t, common::ObIAllocator>&);
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virtual int calc_result_typeN(
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ObExprResType& type, ObExprResType* types, int64_t param_num, common::ObExprTypeCtx& type_ctx) const
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{
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return deduce_result_type(type, types, param_num, type_ctx);
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}
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static int deduce_result_type(
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ObExprResType& type, ObExprResType* types, int64_t param_num, common::ObExprTypeCtx& type_ctx);
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virtual int calc_resultN(
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common::ObObj& result, const common::ObObj* objs_array, int64_t param_num, common::ObExprCtx& expr_ctx) const;
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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 eval_trim(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
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// fill ' ' to %buf with specified charset.
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static int fill_default_pattern(char* buf, const int64_t in_len, common::ObCollationType cs_type, int64_t& out_len);
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private:
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// helper func
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static int lrtrim(const common::ObString src, const common::ObString pattern, int32_t& start, int32_t& end);
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static int ltrim(const common::ObString src, const common::ObString pattern, int32_t& start);
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static int rtrim(const common::ObString src, const common::ObString pattern, int32_t& end);
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static int lrtrim2(const common::ObString src, const common::ObString pattern, int32_t& start, int32_t& end);
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static int ltrim2(const common::ObString src, const common::ObString pattern, int32_t& start,
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const common::ObCollationType& cs_type, const common::ObFixedArray<size_t, common::ObIAllocator>&,
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const common::ObFixedArray<size_t, common::ObIAllocator>&);
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static int rtrim2(const common::ObString src, const common::ObString pattern, int32_t& end,
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const common::ObCollationType& cs_type, const common::ObFixedArray<size_t, common::ObIAllocator>&,
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const common::ObFixedArray<size_t, common::ObIAllocator>&);
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// disallow copy
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DISALLOW_COPY_AND_ASSIGN(ObExprTrim);
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};
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// Ltrim can use ObExprTrim's calc
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class ObExprLtrim : public ObExprTrim {
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public:
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explicit ObExprLtrim(common::ObIAllocator& alloc);
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explicit ObExprLtrim(common::ObIAllocator& alloc, ObExprOperatorType type, const char* name, int32_t param_num);
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virtual ~ObExprLtrim();
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virtual int calc_result_type1(ObExprResType& res_type, ObExprResType& type1, common::ObExprTypeCtx& type_ctx) const;
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virtual int calc_result_typeN(
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ObExprResType& type, ObExprResType* types, int64_t param_num, common::ObExprTypeCtx& type_ctx) const
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{
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return deduce_result_type(type, types, param_num, type_ctx);
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}
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static int deduce_result_type(
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ObExprResType& type, ObExprResType* types, int64_t param_num, common::ObExprTypeCtx& type_ctx);
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virtual int calc_result1(common::ObObj& res_obj, const common::ObObj& obj1, common::ObExprCtx& expr_ctx) const;
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int calc(common::ObObj& res_obj, const common::ObObj& obj1, common::ObExprCtx& expr_ctx, int64_t trim_type_val) const;
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virtual int calc_resultN(
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common::ObObj& result, const common::ObObj* objs_array, int64_t param_num, common::ObExprCtx& expr_ctx) const;
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static int calc_oracle_mode(common::ObObj& result, const int64_t trim_type, const common::ObString& pattern,
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const common::ObString& text, const common::ObObjType& res_type, common::ObExprCtx& expr_ctx,
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const int64_t param_num, const common::ObCollationType& cs_type);
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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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private:
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DISALLOW_COPY_AND_ASSIGN(ObExprLtrim);
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};
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// Rtrim can use ObExprTrim's calc
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class ObExprRtrim : public ObExprLtrim {
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public:
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explicit ObExprRtrim(common::ObIAllocator& alloc);
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virtual ~ObExprRtrim();
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virtual int calc_result1(common::ObObj& res_obj, const common::ObObj& obj1, common::ObExprCtx& expr_ctx) const;
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virtual int calc_resultN(
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common::ObObj& result, const common::ObObj* objs_array, int64_t param_num, common::ObExprCtx& expr_ctx) const;
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virtual int calc_result_type1(ObExprResType& res_type, ObExprResType& type1, common::ObExprTypeCtx& type_ctx) const;
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virtual int calc_result_typeN(
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ObExprResType& type, ObExprResType* types, int64_t param_num, common::ObExprTypeCtx& type_ctx) const
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{
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return ObExprLtrim::deduce_result_type(type, types, param_num, type_ctx);
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}
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static int deduce_result_type(
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ObExprResType& type, ObExprResType* types, int64_t param_num, common::ObExprTypeCtx& type_ctx);
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virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
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{
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return ObExprLtrim::cg_expr(op_cg_ctx, raw_expr, rt_expr);
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}
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private:
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DISALLOW_COPY_AND_ASSIGN(ObExprRtrim);
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};
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} // namespace sql
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} // namespace oceanbase
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#endif /* _OB_SQL_EXPR_TRIM_H_ */
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