Function nullif 

pub fn nullif(lhs: &dyn Array, rhs: &dyn Array) -> Box<dyn Array>

Available on crate feature compute_nullif only.

Returns an Array with the same type as lhs and whose validity is null iff either lhs == rhs or lhs is null.

This has the same semantics as postgres - the validity of the rhs is ignored.

Panics

This function panics iff

• The arguments do not have the same logical type
• The arguments do not have the same length
• The physical type is not supported for this operation (use can_nullif to check)

Example

let lhs = Int32Array::from(&[None, None, Some(1), Some(1), Some(1)]);
let rhs = Int32Array::from(&[None, Some(1), None, Some(1), Some(0)]);
let result = nullif(&lhs, &rhs);

let expected = Int32Array::from(&[None, None, Some(1), None, Some(1)]);

assert_eq!(expected, result.as_ref());