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feat: 가상화 문서들 추가

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DongHyeonka
2026-09-10 08:54:05 +09:00
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docs/n+1liner/final/assets/diagrams/cartesian-row-multiplication/cartesian-row-multiplication.alt.md
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# 컬렉션 하나만 fetch join하면 전송 행이 자식 수만큼 늘어난다
## Alternative text
feed_items와 highlights가 fetch join으로 합쳐져 전송 조인 행이 되고, 그 행이 결과 리스트로 갈 때만 루트 엔티티가 중복 제거되는 흐름.
## Long description
왼쪽에서 feed_items와 highlights 두 테이블이 highlights fetch join으로 들어간다. 조인은 부모 행을 자식 수만큼 반복한 전송 조인 행을 만든다. 그 행이 결과 리스트로 넘어갈 때 Hibernate가 루트 엔티티를 중복 제거하므로 리스트 크기만 줄고 전송 단계의 카테시안은 남는다.
## Elements and evidence
- **feed_items** (store): 부모 테이블 Evidence: L713–L714.
- **highlights** (store): 자식 테이블 Evidence: L713–L714.
- **highlights fetch join** (service): 컬렉션 하나만 fetch join한 루트 쿼리 Evidence: L713–L715.
- **전송 조인 행** (queue): DB가 애플리케이션에 전달한 조인 카디널리티 Evidence: L714–L715, L732–L736.
- **결과 리스트** (sink): Hibernate 6+ 가 루트를 dedup한 뒤의 목록 Evidence: L717–L719.
## Relationships
- **highlights → highlights fetch join:** 자식 행. Evidence: L713–L714.
- **전송 조인 행 → 결과 리스트:** 루트 dedup. Evidence: L717–L719.
- **highlights fetch join → 전송 조인 행:** 카테시안 곱. Evidence: L713–L715, L732–L734.
- **feed_items → highlights fetch join:** 부모 행. Evidence: L713–L714.
docs/n+1liner/final/assets/diagrams/cartesian-row-multiplication/cartesian-row-multiplication.d2
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# 컬렉션 하나만 fetch join하면 전송 행이 자식 수만큼 늘어난다
# Question: 컬렉션 하나만 fetch join했을 때 DB가 전달하는 행은 왜 늘어나는가?
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docs/n+1liner/final/assets/diagrams/cartesian-row-multiplication/cartesian-row-multiplication.dot
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docs/n+1liner/final/assets/diagrams/cartesian-row-multiplication/cartesian-row-multiplication.drawio
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docs/n+1liner/final/assets/diagrams/cartesian-row-multiplication/cartesian-row-multiplication.excalidraw
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docs/n+1liner/final/assets/diagrams/cartesian-row-multiplication/cartesian-row-multiplication.manifest.json
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docs/n+1liner/final/assets/diagrams/cartesian-row-multiplication/cartesian-row-multiplication.mmd
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%% 컬렉션 하나만 fetch join하면 전송 행이 자식 수만큼 늘어난다
%% question: 컬렉션 하나만 fetch join했을 때 DB가 전달하는 행은 왜 늘어나는가?
flowchart LR
n0["feed_items"]
n1["highlights"]
n2["highlights fetch join"]
n3(["전송 조인 행"])
n4["결과 리스트"]
n0 -->|"부모 행"| n2
n1 -->|"자식 행"| n2
n2 -->|"카테시안 곱"| n3
n3 -->|"루트 dedup"| n4
docs/n+1liner/final/assets/diagrams/cartesian-row-multiplication/cartesian-row-multiplication.svg
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<desc id="diagram-description">왼쪽에서 feed_items와 highlights 두 테이블이 highlights fetch join으로 들어간다. 조인은 부모 행을 자식 수만큼 반복한 전송 조인 행을 만든다. 그 행이 결과 리스트로 넘어갈 때 Hibernate가 루트 엔티티를 중복 제거하므로 리스트 크기만 줄고 전송 단계의 카테시안은 남는다.</desc>
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