51 lines
1.9 KiB
C++
51 lines
1.9 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_PREFIX_PATTERN_
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#define OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_PREFIX_PATTERN_
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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 ObExprPrefixPattern : public ObStringExprOperator
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{
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public:
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explicit ObExprPrefixPattern(common::ObIAllocator &alloc);
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virtual ~ObExprPrefixPattern() {};
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virtual int calc_result_type3(ObExprResType &type,
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ObExprResType &type1,
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ObExprResType &type2,
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ObExprResType &type3,
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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 int eval_prefix_pattern(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &expr_datum);
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private:
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static int calc_prefix_pattern(const ObString &pattern,
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ObCollationType pattern_coll,
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const ObString &escape,
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ObCollationType escape_coll,
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int64_t prefix_len,
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int64_t &result_len,
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bool &is_valid);
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DISALLOW_COPY_AND_ASSIGN(ObExprPrefixPattern) const;
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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_OB_EXPR_POWER_
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