Detect NULL Values
Functions isNull or hasNull detect NULL values. isNull
returns
a scalar or a vector depending on the input data; hasNull
always
returns 0 or 1 indicating if an object contains at least one NULL value.
isNull(00i);
// output
1
isNull(-128c);
// output
1
// the minimum char is reserved for NULL value
isNull(1 NULL 2);
// output
[0,1,0]
hasNull(1 NULL 2);
// output
1