An auxiliary table containing statistical information on the
relative frequency of different quasi-identifiers values. It has
one or several quasi-identifiers columns, and one column that
indicates the relative frequency of each quasi-identifier tuple.
If a tuple is present in the data but not in the auxiliary
table, the corresponding relative frequency is assumed to be
zero (and thus, the tuple is highly reidentifiable).
.storage.FieldId
Required. The relative frequency column must
contain a floating-point number between 0 and 1
(inclusive). Null values are assumed to be zero.