The structure that represents a null filter.
A structure that represents a singular filter constant, used in filters to specify a single value to match against.
A Boolean value that indicates if the filter is inverse.
The type of the null filter. Valid values for this type are NULLS_ONLY, NON_NULLS_ONLY, and ALL_VALUES.
NULLS_ONLY
NON_NULLS_ONLY
ALL_VALUES