# Module mz_transform::nonnullable

source · ## Expand description

Harvests information about non-nullability of columns from sources.

This transformation can simplify logic when columns are known to be non-nullable. Predicates that tests for null can be elided, and aggregations can be simplified.

## Structs§

- Harvests information about non-nullability of columns from sources.

## Functions§

- Transformations to aggregation functions, based on nonnullability of columns.
- True if the expression contains a “is null” test.
- Transformations to scalar functions, based on nonnullability of columns.