Module complex_type_lambda 

Lambda higher-order functions for arrays and maps (F-SCHEMA-015 Tier 3) Lambda higher-order functions for arrays and maps (F-SCHEMA-015 Tier 3).

Provides vectorized lambda evaluation over Arrow arrays:

Function	Lambda	Strategy
array_transform(arr, lambda)	x -> expr	Flatten, eval, re-group
array_filter(arr, lambda)	x -> bool	Flatten, eval, filter+rebuild
array_reduce(arr, init, lambda)	(acc, x) -> expr	Sequential fold
map_filter(map, lambda)	(k, v) -> bool	Eval on k+v, filter entries
map_transform_values(map, lambda)	(k, v) -> expr	Eval on k+v, replace vals

Lambda expressions are specified as string literal SQL expressions. They are evaluated using DataFusion’s SQL engine against a temporary table containing the element values. Native lambda syntax is deferred.

Structs

ArrayFilter

array_filter(arr, 'x > 0') — filter elements by a boolean lambda.

ArrayReduce

array_reduce(arr, init, '(acc + x)') — fold/reduce array elements.

ArrayTransform

array_transform(arr, 'x + 1') — apply a lambda to each element.

MapFilter

map_filter(map, '(k <> ''temp'')') — filter map entries by key+value.

MapTransformValues

map_transform_values(map, 'v * 2') — transform map values.

Functions

register_lambda_functions

Registers all lambda HOFs with the given session context.