CharlesKWON 6c8d5f8b3b fix(FiveSql2): correlated scalar subquery with JOIN — 3 interacting bugs
A scalar correlated subquery with a JOIN inside:

    SELECT e.name,
      (SELECT SUM(o.qty * p.price)
       FROM ord o INNER JOIN prod p ON o.prod_id = p.id
       WHERE o.emp_id = e.id) AS revenue
    FROM emp e WHERE e.dept = 'SALES'

returned wrong values (equal to SUM(qty) instead of SUM(qty*price))
or zero for all but the first outer row. Root cause was a triple
interaction between three independent bugs.

--- Bug 1: Subquery cache leaked across five_SQL invocations ---

hSubCorrCache, aSubCacheSlots, aSemiJoinSlots, nSubCacheSeq were
declared as DATA ... INIT { => } / {} / 0. In Five's compiled output,
hash/array INIT literals may share the same backing instance across
New() calls, so the cache from query A (SUM qty, no join) was still
there when query B ran, providing a hit on the same key — returning
A's cached (wrong) value instead of re-executing B's subquery.

Fix: explicit initialization in New().

--- Bug 2: aJoins alias mutation across subquery invocations ---

RunSelect's join-alias sync loop mutated aJoins[i][3] from the
user alias ("p") to the depth-suffixed temp alias ("FA_0003").
aJoins was a direct reference into hQuery["joins"], so the mutation
persisted across re-executions of the same hQuery. On the 2nd call,
the sync loop couldn't find a matching aTables entry because the
stale temp alias ("FA_0003") didn't match the new one ("FA_0005").
The join table's workarea was positioned wrong → empty join result.

Fix: deep-clone both ::aTables and aJoins at the start of RunSelect
so each invocation starts from the parsed originals.

--- Bug 3: SqlCollectCols stripped alias prefixes ---

When adding hidden columns for complex aggregate arguments (e.g.
SUM(o.qty * p.price)), SqlCollectCols returned bare names like
"qty" and "price" instead of qualified "o.qty" / "p.price". In a
JOIN context, unqualified "price" routed FetchRow to the first
table (ord) instead of prod — FieldPos returned 0, the column was
silently NIL, and the multiplication collapsed to qty*1 = qty.

Fix: new SqlCollectColExprs returns the original ND_COL AST nodes
with qualified names preserved. The hidden-column loop now inserts
these directly so FetchRow's dot-qualified path resolves to the
correct workarea via FindWA.

--- Verification ---

Deterministic 5-emp / 6-order / 3-product test:

    Expected revenues per emp:
      Emp 1: 2*10 + 3*20 = 80    → got 80.00 ✓
      Emp 2: 1*10 + 4*30 = 130   → got 130.00 ✓
      Emp 3: 5*20 = 100          → got 100.00 ✓
      Emp 4: no orders = 0       → got 0 ✓
      Emp 5: 7*10 = 70           → got 70.00 ✓

Also verified SUM(qty*2) and SUM(p.price) variants.

Validation:
  - FiveSql2 43/43
  - Harbour compat 51/51
  - go test ./... ALL PASS

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-16 11:33:35 +09:00

Five — Harbour + Go Fusion Language

Harbour PRG 코드를 네이티브 Go 바이너리로 컴파일하는 퓨전 언어.

30년간 축적된 Harbour/xBase 비즈니스 로직을 Go의 성능, 동시성, 크로스 플랫폼 위에서 실행합니다.

employees.prg  →  five build  →  employees (단일 실행파일, 18MB)

주요 특징

  • Harbour 문법 100% 지원 (CLASS, CODE BLOCK, BEGIN SEQUENCE, ...)
  • Go 네이티브 바이너리 출력 (CGo 없음, 순수 Go)
  • DBF/NTX/CDX 데이터베이스 엔진 내장
  • 479개 RTL 내장 함수
  • FiveSql2: DBF 위에서 SQL:1999 쿼리 (43/43 테스트 통과)
  • Goroutine/Channel 확장 (GO BLOCK, CHANNEL)
  • @byref 참조 전달, mutable closure
  • 대화형 디버거 (TUI/CLI)

빌드 방법

1. Go 설치

Five는 Go 1.21 이상이 필요합니다.

Linux/WSL:

# 이미 설치되어 있는지 확인
go version

# 없으면 설치
wget https://go.dev/dl/go1.22.5.linux-amd64.tar.gz
sudo rm -rf /usr/local/go
sudo tar -C /usr/local -xzf go1.22.5.linux-amd64.tar.gz
echo 'export PATH=$PATH:/usr/local/go/bin:$HOME/go/bin' >> ~/.bashrc
source ~/.bashrc
go version

macOS (Apple Silicon — M1/M2/M3/M4):

brew install go
# 또는 직접 다운로드:
wget https://go.dev/dl/go1.22.5.darwin-arm64.tar.gz
sudo tar -C /usr/local -xzf go1.22.5.darwin-arm64.tar.gz
echo 'export PATH=$PATH:/usr/local/go/bin:$HOME/go/bin' >> ~/.zshrc
source ~/.zshrc

macOS (Intel):

brew install go
# 또는 직접 다운로드:
wget https://go.dev/dl/go1.22.5.darwin-amd64.tar.gz
sudo tar -C /usr/local -xzf go1.22.5.darwin-amd64.tar.gz
echo 'export PATH=$PATH:/usr/local/go/bin:$HOME/go/bin' >> ~/.zshrc
source ~/.zshrc

Windows:

https://go.dev/dl/ 에서 .msi 설치

2. Five 컴파일러 빌드

git clone https://gitea.fivego.org/fivedev/five.git
cd five
go build -o five ./cmd/five

빌드 확인:

./five version

3. PRG 프로그램 컴파일 및 실행

단일 파일:

# 컴파일
./five build examples/hello.prg -o hello

# 실행
./hello

다중 파일 (FiveSql2 등):

./five build _FiveSql2/test/test_sql1999.prg _FiveSql2/src/*.prg -o test_sql
./test_sql

4. 테스트 실행

# Go 유닛 테스트
go test ./...

# FiveSql2 SQL 테스트 (43/43)
./five build _FiveSql2/test/test_sql1999.prg _FiveSql2/src/*.prg -o /tmp/test_sql
cd /tmp && ./test_sql

# Harbour 호환 테스트 (51/51)
./five build tests/compat_harbour.prg -o /tmp/test_compat
/tmp/test_compat

Five 명령어

five run <file.prg>              컴파일 후 즉시 실행
five build <file.prg> [-o out]   네이티브 바이너리 생성
five gen <file.prg>              생성된 Go 코드 출력 (디버깅용)
five debug <file.prg>            대화형 디버거 실행
five version                     버전 정보

Hello World

// hello.prg
PROCEDURE Main()
   ? "Hello, Five!"
   ? "Date:", Date()
   ? "Time:", Time()
RETURN
./five build hello.prg -o hello && ./hello

SQL 예제

// sql_demo.prg
#include "FiveSqlDef.ch"

PROCEDURE Main()
   // 테이블 생성
   five_SQL("CREATE TABLE employees (id INTEGER, name CHAR(30), salary NUMERIC(12,2))")

   // 데이터 삽입
   five_SQL("INSERT INTO employees (id, name, salary) VALUES (1, 'Alice', 8000)")
   five_SQL("INSERT INTO employees (id, name, salary) VALUES (2, 'Bob', 7000)")

   // SQL 쿼리
   LOCAL aR := five_SQL("SELECT name, salary FROM employees WHERE salary > 6000 ORDER BY salary DESC")

   ? "Results:", Len(aR[2]), "rows"
   LOCAL i
   FOR i := 1 TO Len(aR[2])
      ? "  ", aR[2][i][1], aR[2][i][2]
   NEXT
RETURN
./five build sql_demo.prg _FiveSql2/src/*.prg -o sql_demo && ./sql_demo

프로젝트 구조

five/
├── cmd/five/          Five CLI (main entry point)
├── compiler/          PRG → Go 컴파일러
│   ├── lexer/         토크나이저
│   ├── parser/        구문 분석기
│   ├── analyzer/      의미 분석기
│   ├── gengo/         Go 코드 생성기
│   └── pp/            전처리기 (#include, #define)
├── hbrt/              런타임 (VM, Stack, Value, Class)
├── hbrtl/             RTL 표준 라이브러리 (479개 함수)
├── hbrdd/             RDD 데이터베이스 엔진
│   ├── dbf/           DBF 파일 드라이버
│   ├── ntx/           NTX 인덱스 드라이버
│   ├── cdx/           CDX 인덱스 드라이버
│   └── mem/           메모리 RDD
├── _FiveSql2/         SQL:1999 엔진 (PRG)
│   ├── src/           SQL 엔진 소스 (14 파일, 10,458 LOC)
│   └── test/          SQL 테스트 스위트
├── tests/             호환성 테스트
├── examples/          예제 프로그램
└── docs/              기술 문서

현재 상태

항목 수치
Go 프로덕션 코드 ~36,000 LOC
RTL 내장 함수 479개
RDD 드라이버 4종 (DBF, NTX, CDX, Memory)
FiveSql2 테스트 43/43 (100%)
호환 테스트 51/51 (100%)
Go 테스트 ALL PASS

라이선스

Copyright (c) 2025-2026 Charles KWON OhJun (charleskwonohjun@gmail.com) All rights reserved.

Description
Five — Harbour+Go Fusion Language (PRG→Go native binary)
Readme 64 MiB
Languages
Go 57.9%
xBase 22%
C 19.5%
Shell 0.5%
Makefile 0.1%