Maps each Transform to its TransformSignature, the single source of truth for how a transform
validates its input and shapes its output. Processors consult this table to check type compatibility, rejecting a
transform whose declared domain is met by no branch of its input type and guarding the incompatible branches of a
union-typed input otherwise, and to derive the aggregation kind, cardinality, and processing type of the resulting
pipe.
Transform signature table.
Maps each Transform to its TransformSignature, the single source of truth for how a transform validates its input and shapes its output. Processors consult this table to check type compatibility, rejecting a transform whose declared domain is met by no branch of its input type and guarding the incompatible branches of a union-typed input otherwise, and to derive the aggregation kind, cardinality, and processing type of the resulting pipe.