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Closes #198
Picks up where #209 left off with @Fokko's feedback addressed. Thanks @jayceslesar for the original work.
Rationale for this change
Adds
CAST(column AS type)parsing that maps to Iceberg transforms (date→DayTransform,year→YearTransform,month→MonthTransform,hour→HourTransform). Also implementsBoundTransform.ref()andeval()— both were missing abstract methods required byBoundTerm. IntroducesUnboundTransformwithbind()that validates viacan_transform().Are these changes tested?
Yes. 11 new tests covering all transform types, case insensitivity, nested fields, unsupported types, comparison operators, and boolean composition.
Are there any user-facing changes?
No.