same(a: storable, b: storable) -> bool

Return true if A is the same as B. Different from the = operator or eq which implements ternary logic, same treats null as a unique value by itself and therefore can be used to compare nullable values. For instance, same(null, null) returns true, and same(null, "hello") returns false, whereas both null=null and null="hello" return null.

Domain

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

Categories

• Boolean

Examples

make_col s:same(col1, col2)

Set s to true if column col1 contains the same value as col2, and false otherwise. Here a null value is considered the same as another null value, and as a result s will never contain any null value.