Module transform 

Transform Engine

Pipeline transforms applied to binding values. Transforms are chained with | pipes: sort | unique | first(3)

Categories

Category	Ops
String	upper, lower, trim, trim_start, trim_end
Collection	length, first, last, first(N), last(N), keys, values, flatten, reverse, sort, unique, compact
Type conversion	to_string, to_number, to_bool, to_json, parse_json
Numeric	round(N), abs, ceil, floor
Utility	default(V), type_of, join(S), split(S), shell

Null Handling

• Propagating: null in → null out (length, keys, type_of, to_string, to_json)
• Failing: null in → NIKA-153 error (upper, lower, sort, etc.)
• Use default() or ?? to handle nulls safely

Structs

TransformExpr

A chain of transform operations: sort | unique | first(3)

TransformParseError

Error parsing a transform expression (NIKA-151)

Enums

TransformError

Error applying a transform (NIKA-152 type mismatch, NIKA-153 null input)

TransformOp

A single transform operation