92 lines
3.7 KiB
C++
92 lines
3.7 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_SUBSTR_
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#define OCEANBASE_SQL_ENGINE_EXPR_SUBSTR_
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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 ObExprSubstr : public ObStringExprOperator
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{
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public:
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explicit ObExprSubstr(common::ObIAllocator &alloc);
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virtual ~ObExprSubstr();
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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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static int substr(common::ObString &output,
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const common::ObString &input,
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const int64_t pos,
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const int64_t len,
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common::ObCollationType cs_type,
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const bool do_ascii_optimize_check);
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static int calc(common::ObObj &result,
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const common::ObString &text,
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const int64_t start_pos,
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const int64_t length,
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common::ObCollationType cs_type,
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const bool is_clob);
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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 eval_substr(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &expr_datum);
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static int eval_substr_batch(
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const ObExpr &expr, ObEvalCtx &ctx, const ObBitVector &skip, const int64_t batch_size);
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private:
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int calc_result_length(ObExprResType *types_array,
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int64_t param_num,
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common::ObCollationType cs_type,
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int64_t &res_len) const;
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int calc_result_length_oracle(const ObExprResType *types_array,
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int64_t param_num,
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const ObExprResType &result_type,
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int64_t &res_len) const;
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int calc_result2_for_mysql(common::ObObj &result,
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const common::ObObj &text,
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const common::ObObj &start_pos,
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common::ObExprCtx &expr_ctx) const;
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int calc_result2_for_oracle(common::ObObj &result,
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const common::ObObj &text,
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const common::ObObj &start_pos,
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common::ObExprCtx &expr_ctx) const;
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int calc_result3_for_mysql(common::ObObj &result,
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const common::ObObj &text,
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const common::ObObj &start_pos,
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const common::ObObj &length,
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common::ObExprCtx &expr_ctx) const;
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int calc_result3_for_oracle(common::ObObj &result,
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const common::ObObj &text,
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const common::ObObj &start_pos,
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const common::ObObj &length,
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common::ObExprCtx &expr_ctx) const;
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int cast_param_type_for_mysql(const common::ObObj& in,
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common::ObExprCtx& expr_ctx,
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common::ObObj& out) const;
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// disallow copy
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DISALLOW_COPY_AND_ASSIGN(ObExprSubstr);
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};
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}
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}
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#endif /* OCEANBASE_SQL_ENGINE_EXPR_SUBSTR_ */
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