# 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.

## Statics

## 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.