64 lines
2.8 KiB
C++
64 lines
2.8 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_OB_EXPR_SOUNDEX_
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#define OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_SOUNDEX_
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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 ObExprSoundex : public ObFuncExprOperator
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{
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public:
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explicit ObExprSoundex(common::ObIAllocator &alloc);
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virtual ~ObExprSoundex() {};
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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 override;
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static int8_t get_character_code(const int32_t wchar);
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static int convert_str_to_soundex(const ObString &input,
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const ObCollationType input_cs_type,
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const bool use_original_algo,
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const bool fix_min_len,
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char *buf, const int64_t len, int64_t &pos,
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bool &is_first,
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int8_t &last_soundex_code);
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static int calc(const ObString &input, const ObCollationType intput_cs_type,
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const ObCollationType res_cs_type,
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common::ObIAllocator &tmp_alloc, common::ObIAllocator &res_alloc,
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ObString &out);
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static int calc_text(const ObDatum &input_datum,
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const ObObjType input_type,
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const ObObjType res_type,
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const ObCollationType input_cs_type,
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const ObCollationType res_cs_type,
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const bool input_has_lob_header,
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ObIAllocator &tmp_alloc, ObIAllocator &res_alloc,
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ObString &out,
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bool has_lob_header);
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static int eval_soundex(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &expr_datum);
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private:
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static const int64_t MIN_RESULT_LENGTH = 4;
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// if result collation type is nonascii such as utf16, we need charset convert in the end.
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// str_allocator_ is used to allocate memory for result before charset convert.
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common::ObArenaAllocator str_allocator_;
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DISALLOW_COPY_AND_ASSIGN(ObExprSoundex);
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};
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}
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}
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#endif /* OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_SOUNDEX_ */
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