60 lines
1.9 KiB
C++
60 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 _OB_RAW_EXPR_GET_HASH_VALUE_H
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#define _OB_RAW_EXPR_GET_HASH_VALUE_H 1
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#include "sql/optimizer/ob_logical_operator.h"
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#include "sql/resolver/expr/ob_raw_expr.h"
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namespace oceanbase {
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namespace sql {
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/**
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* This class is used to traverse an expression tree in a post-order fashion to
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* add all required expressions into the context data structure, which is used
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* during output expr allocation.
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*/
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class ObRawExprGetHashValue: public ObRawExprVisitor
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{
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public:
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ObRawExprGetHashValue(uint64_t seed) : seed_(seed) {}
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virtual ~ObRawExprGetHashValue() {}
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/**
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* The starting point
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*/
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int get_hash_value(ObRawExpr &expr);
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/// interface of ObRawExprVisitor
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virtual int visit(ObConstRawExpr &expr);
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virtual int visit(ObVarRawExpr &expr);
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virtual int visit(ObOpPseudoColumnRawExpr &expr);
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virtual int visit(ObQueryRefRawExpr &expr);
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virtual int visit(ObColumnRefRawExpr &expr);
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virtual int visit(ObOpRawExpr &expr);
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virtual int visit(ObCaseOpRawExpr &expr);
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virtual int visit(ObAggFunRawExpr &expr);
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virtual int visit(ObSysFunRawExpr &expr);
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virtual int visit(ObSetOpRawExpr &expr);
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virtual int visit(ObPlQueryRefRawExpr &expr);
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private:
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int add_expr(ObRawExpr &expr);
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private:
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uint64_t seed_;
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// disallow copy
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DISALLOW_COPY_AND_ASSIGN(ObRawExprGetHashValue);
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};
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}
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}
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#endif // _OB_RAW_EXPR_GET_HASH_VALUE_H
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