UNSUPPORTED_GENERATOR error class
The generator is not supported:
This error class has the following derived error classes:
MULTI_GENERATOR
only one generator allowed per <clause> clause but found <size>: <generators>
NESTED_IN_EXPRESSIONS
nested in expressions <expressions>
NOT_GENERATOR
<name> is expected to be a generator. However, its class is <classCanonicalName>, which is not a generator.
OUTSIDE_SELECT
outside the SELECT clause, found: <plan>