61 lines
3.1 KiB
C++
61 lines
3.1 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_ENGINE_EXPR_SUBSTRB_
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#define OCEANBASE_SQL_ENGINE_EXPR_SUBSTRB_
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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 ObExprSubstrb : public ObStringExprOperator {
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public:
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explicit ObExprSubstrb(common::ObIAllocator& alloc);
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virtual ~ObExprSubstrb();
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virtual int calc_result2(common::ObObj& result, const common::ObObj& text, const common::ObObj& start_pos,
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common::ObExprCtx& expr_ctx) const;
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virtual int calc_result3(common::ObObj& result, const common::ObObj& text, const common::ObObj& start_pos,
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const common::ObObj& length, common::ObExprCtx& expr_ctx) const;
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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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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(common::ObObj& result, const common::ObString& text, int64_t start_pos, int64_t length,
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common::ObCollationType cs_type, const common::ObObjType& res_type, common::ObExprCtx& expr_ctx);
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static int calc(common::ObString& res_str, const common::ObString& text, int64_t start, int64_t length,
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common::ObCollationType cs_type, common::ObIAllocator& alloc);
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virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const;
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static int calc_substrb_expr(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res);
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private:
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int calc_result_length_in_byte(const ObExprResType& type, ObExprResType* types_array, int64_t param_num,
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common::ObCollationType cs_type, int64_t& res_len) const;
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static int handle_invalid_byte(char* ptr, const int64_t text_len, int64_t& start, int64_t& len, char reset_char,
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common::ObCollationType cs_type);
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static int ignore_invalid_byte(
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char* ptr, const int64_t text_len, int64_t& start, int64_t& len, common::ObCollationType cs_type);
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static int reset_invalid_byte(
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char* ptr, const int64_t text_len, int64_t start, int64_t len, char reset_char, common::ObCollationType cs_type);
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// return the well formatted boundary of charset,
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// set boundary_len to -1 if no valid boundary found (invalid character of charset).
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static int get_well_formatted_boundary(common::ObCollationType cs_type, char* ptr, const int64_t len, int64_t pos,
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int64_t& boundary_pos, int64_t& boundary_len);
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// disallow copy
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DISALLOW_COPY_AND_ASSIGN(ObExprSubstrb);
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};
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} // namespace sql
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} // namespace oceanbase
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#endif /* OCEANBASE_SQL_ENGINE_EXPR_SUBSTRB_ */
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