ASSUME_NOT_NULL (Lakehouse v1)

Results in an equivalent non-Nullable value for a Nullable type. In case the original value is NULL the result is undetermined.

Analyze Syntax

func.assume_not_null(<x>)

Analyze Examples

With a table like:

┌────────────────────┐
│        x  │   y    │
├────────────────────┤
│         1 │   NULL │
│         2 │      3 │
└────────────────────┘

func.assume_not_null(y)
┌─────────────────────────┐
│ func.assume_not_null(y) │
├─────────────────────────┤
│                       0 │
│                       3 │
└─────────────────────────┘

SQL Syntax

ASSUME_NOT_NULL(<x>)

Aliases

• REMOVE_NULLABLE

Return Type

Returns the original datatype from the non-Nullable type; Returns the embedded non-Nullable datatype for Nullable type.

SQL Examples

CREATE TABLE default.t_null ( x int,  y int null);

INSERT INTO default.t_null values (1, null), (2, 3);

SELECT ASSUME_NOT_NULL(y), REMOVE_NULLABLE(y) FROM t_null;

┌─────────────────────────────────────────┐
│ assume_not_null(y) │ remove_nullable(y) │
├────────────────────┼────────────────────┤
│                  0 │                  0 │
│                  3 │                  3 │
└─────────────────────────────────────────┘