coalesceNums static method
Create sql statement with function COALESCE() function applied for several values,
values may be int - double - NumField - IntField - DoubleField.
COALESCE() is used to get first not null value of values, if all values are null,
it returns null.
Implementation
static DoubleField coalesceNums(List values) =>
_buildCollectionNumValuesFunction('COALESCE', values);