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coalesce() Loses Type Information, Always Returns BasicExpression<any

coalesce() Loses Type Information, Always Returns BasicExpression<any: a task in LegoFlow-SWE (Harbor dataset). The coalesce() helper currently discards the types of its arguments and always resolves to BasicExpression<any . This causes every field selected with coalesce() to lose its type, which…

The task

The `coalesce()` helper currently discards the types of its arguments and always resolves to `BasicExpression<any>`. This causes every field selected with `coalesce()` to lose its type, which breaks type‑safety throughout the query—especially in full‑join merges that rely on accurate column types.

Part of Lego-X/LegoFlow-SWE.