bool_null

Description

Returns a null value of type bool.

This is important because some functions, like case(), return more convenient outputs if all their arguments are of the same type.

Return type

bool

Domain

This is a scalar function (calculates a single output value for a single input row.)

Categories

Usage

bool_null()

Examples

make_col positive_or_null:case(x > 0, x, true, bool_null())

Create a column ‘positive_or_null’ which is either a positive bool, or the null bool.