fix: normalize type aliases and add promotion rules for schema evolution#82
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- Add normalize_ducklake_type() for canonical type resolution (int/integer/INT all -> int32) - Add is_promotable() for safe type widening (int->bigint, float->double, timestamp->timestamptz) - Add types_compatible() combining normalization + promotion for schema evolution checks - Replace exact string equality with types_compatible() in schema evolution Found during Feb 2026 security review Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
The previous check (tp >= fp && ts >= fs) allowed promotions like decimal(10,2) → decimal(12,8) where the integer part shrinks from 8 to 4 digits, potentially causing overflow. Now checks that both integer digits (precision - scale) and fractional digits don't shrink.
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Summary
normalize_ducklake_type()to convert type aliases to canonical forms (e.g., "int" -> "int32", "text" -> "varchar")is_promotable()with safe type widening rules: integer widening, float widening, int-to-float64, timestamp-to-timestamptz, decimal precision wideningtypes_compatible()that checks alias equivalence and promotion for schema evolutiontypes_compatible()so that e.g. a table with "int" columns can accept "int32" data without errorTest plan
normalize_ducklake_type()across all alias families (int, bigint, string, float, double, bool, smallint, tinyint)is_promotable()covering signed/unsigned widening, float widening, int-to-float, timestamp promotion, decimal widening, and rejection of narrowing/incompatible typestypes_compatible()covering alias equivalence, case insensitivity, promotion, and incompatible typescargo testpasses