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Charles KWON OhJun 486e466592 feat: FiveSql2 43/43, @byref, mutable closure, RTL 479, DateTime fix

Major changes since last commit:
- FiveSql2 SQL:1999 engine (10,458 LOC) — 43/43 ALL PASS
- 21 compiler/runtime bugs fixed (short-circuit AND/OR, FOR LOOP, etc.)
- @byref pass-by-reference via RefCell pattern
- Mutable closure capture (EnsureLocalRef + RefCell sharing)
- RTL: 400 → 479 functions (+79: file, string, datetime, hash, UTF-8)
- DateTime/Timestamp fully working (hb_DateTime, hb_Hour/Min/Sec, display)
- Reserved word guard (39 keywords blocked from function calls)
- AEval arg order fix (element before index)
- Closure capture redecl fix (unique _cap_ names per block)
- Hash/string indexing in ArrayPush/ArrayPop
- Harbour compat test suite: 51/51
- 4 docs: Porting Report, Implementation Plan, Optimization Plan, Commercialization

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-11 11:35:37 +09:00

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FiveSql2 — SQL Engine for Harbour DBF/NTX/CDX

Pratt parser + SQL:1992-2023 full standard support Supports both NTX (Clipper) and CDX (FoxPro/ADS) indexes

Architecture

five_SQL("SELECT ...")
   │
   ├── TSqlLexer        Tokenizer
   ├── TSqlParser2      Pratt parser (data-driven operators)
   ├── TSqlExecutor     Query executor (Volcano model)
   │     ├── TSqlAlias  Central alias manager (no collisions)
   │     ├── TSqlIndex  NTX/CDX index optimization (auto-detect)
   │     ├── TSqlAgg    GROUP BY / aggregation
   │     ├── TSqlSort   ORDER BY / DISTINCT
   │     ├── TSqlDDL    CREATE/DROP/ALTER TABLE/INDEX
   │     └── TSqlTxn    BEGIN/COMMIT/ROLLBACK
   ├── TSqlExpr         AST nodes + expression evaluation
   └── TSqlFunc         60+ scalar functions

Build & Test

export PATH="/path/to/harbour-core/bin/linux/gcc:$PATH"
export HB_INSTALL_PREFIX="/path/to/harbour-core"

make          # Build all tests
make test     # Run all 157 tests
make bench    # Parser benchmark
make clean    # Clean

SQL Standard Coverage

Standard	Features	Tests
SQL:1992	SELECT, JOIN, GROUP BY, HAVING, Subquery, CASE, CAST	43
SQL:1999	CTE, Recursive CTE, Window Functions, MERGE	10
SQL:2003	SIMILAR TO, GROUPING SETS, LATERAL, Window frames	64
SQL:2008	FETCH/OFFSET, FOR UPDATE, Extended MERGE	(incl.)
SQL:2016	JSON functions, LISTAGG	(incl.)
SQL:2023	ANY_VALUE, GREATEST/LEAST, BOOL_AND/OR	(incl.)
Challenge	LeetCode-level complex queries	15
Extreme	Production analytics stress tests	15

Adding New Operators

Edit TSqlParser2.prg, method InitInfixTables():

::hInfixTT[ TK_MYOP ] := { "<=>", 40, 41, ND_BIN }

One line. No structural changes needed.

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