What kind of value a field holds, and therefore how it may be compared.
list is a set of strings on one row — the states a market is licensed in,
the coverage lines it writes. It is filtered by membership (has, hasAny,
contains, isEmpty, notEmpty) and can be neither grouped nor
aggregated: grouping by a set has no single answer, and the set's members are
better asked about as rows of their own dataset when they need counting.
What kind of value a field holds, and therefore how it may be compared.
listis a set of strings on one row — the states a market is licensed in, the coverage lines it writes. It is filtered by membership (has,hasAny,contains,isEmpty,notEmpty) and can be neither grouped nor aggregated: grouping by a set has no single answer, and the set's members are better asked about as rows of their own dataset when they need counting.