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Milestone 5: DuckDB-native statement transformers #4

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Milestone 5: DuckDB-native statement transformers #4

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12 changes: 8 additions & 4 deletions CLAUDE.md
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Expand Up @@ -88,10 +88,14 @@ go test ./parser -run TestCorpus -check-parse 'FRAGMENT' # dump detail for it
go test ./parser # gate
```

Oracle rejects raised by upstream's *transformer* (Parser Errors whose
message is not "syntax error at or near ...") that darkwing's transformer
does not reproduce yet stay in todo metadata with a note saying why; the
harness flags todo entries that start agreeing so they get removed.
Since milestone 5 every statement has a transformer and the upstream
transformer's own Parser Errors are reproduced. The remaining todo
entries cover oracle rejects raised *outside* the parse pipeline —
bind-time validation that happens to throw ParserException (setting
values, function argument checks, PRIMARY KEY verification) and nested
SQL parsing inside functions like query() and nextval() — each with a
note saying why; the harness flags todo entries that start agreeing so
they get removed.

Sweeping tree shapes against a live oracle (milestones 3-4 exit
criteria: zero mismatches over the corpus SELECT subset):
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