100 lines
2.5 KiB
C++
100 lines
2.5 KiB
C++
/**
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* Copyright (c) 2023 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_SHARED_EXPR_RESOLVER_H
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#define OB_SHARED_EXPR_RESOLVER_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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struct JoinedTable;
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struct TableItem;
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struct ObQuestionmarkEqualCtx : public ObExprEqualCheckContext
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{
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ObQuestionmarkEqualCtx(bool need_check_deterministic = false):
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ObExprEqualCheckContext(need_check_deterministic)
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{
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override_const_compare_ = true;
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}
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bool compare_const(const ObConstRawExpr &left,
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const ObConstRawExpr &right);
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ObSEArray<ObPCParamEqualInfo, 4> equal_pairs_;
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};
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struct ObRawExprEntry
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{
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ObRawExprEntry() :expr_(NULL), stmt_scope_(0), hash_code_(0)
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{ }
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ObRawExprEntry(ObRawExpr *expr, uint64_t scope_id, uint64_t hash_code)
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: expr_(expr), stmt_scope_(scope_id), hash_code_(hash_code)
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{}
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bool compare(const ObRawExprEntry &node,
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ObQuestionmarkEqualCtx &cmp_ctx) const;
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TO_STRING_KV(K_(hash_code), K_(expr));
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ObRawExpr *expr_;
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uint64_t stmt_scope_;
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uint64_t hash_code_;
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};
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class ObSharedExprResolver
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{
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public:
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ObSharedExprResolver(ObQueryCtx *query_ctx)
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: allocator_("MergeSharedExpr"),
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scope_id_(0),
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query_ctx_(query_ctx)
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{}
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virtual ~ObSharedExprResolver();
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int get_shared_instance(ObRawExpr *expr,
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ObRawExpr *&shared_expr,
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bool &is_new);
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int add_new_instance(ObRawExprEntry &entry);
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uint64_t get_scope_id() const { return scope_id_; }
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void set_new_scope() { scope_id_ ++; }
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void revert_scope() { scope_id_ = 0; }
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uint64_t hash_expr_tree(ObRawExpr *expr, uint64_t hash_code, const bool is_root = true);
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private:
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int inner_get_shared_expr(ObRawExprEntry &entry,
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ObRawExpr *&new_expr);
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private:
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typedef ObSEArray<ObRawExprEntry, 1> SharedExprs;
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ObArenaAllocator allocator_;
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hash::ObHashMap<uint64_t, SharedExprs *> shared_expr_map_;
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uint64_t scope_id_;
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ObQueryCtx *query_ctx_;
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};
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}
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}
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#endif // OB_SHARED_EXPR_RESOLVER_H
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