Charles KWON OhJun c04c9aeaa8 feat: INDEX ON with UDF support — user functions in key expressions ...

Core change:
- dbf.KeyEvalFunc: global callback set by gengo before OrderCreate
- evalKeyExprInner default case: calls KeyEvalFunc for unknown functions
- Final fallback: any unresolvable expression → KeyEvalFunc → MacroEval
- valueToKeyBytes: converts MacroEval result to index key bytes
- gengo: sets dbf.KeyEvalFunc = t.MacroEval before OrderCreate, clears after

Examples that now work:
  INDEX ON MyFunc(FIELD->NAME) TO idx    // UDF in key expression
  INDEX ON CityKey(FIELD->CITY, NAME) TO idx  // multi-param UDF
  INDEX ON Left(MyFunc(NAME), 15) TO idx // nested built-in + UDF

Also fixed:
- SET ORDER TO n: int→string via hbrt.NtoS (was empty string)
- CDX compound leaf decoder: proper bit-packed tag name extraction
- CDX compound recNo = direct byte offset (not page number)

All existing tests pass, NTX 47/47 + CDX 20/20 Harbour compat maintained.

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

2026-04-06 13:36:21 +09:00

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