parseComparison doesn't accept fields without relation for use with contains()
In the query builder you can use contains() for fields with a relation or for fields that are of type 'select' and have maxitems > 1. There are also other fields (such as 'keywords') which contain comma separated values, but do not have a relation and are not of type 'select'. For these fields a beautiful exception is thrown.
The alternative for such fields is to use the LIKE monstrosity (field LIKE '%,keyword,%' OR field LIKE '%,keyword' OR field LIKE 'keyword,%' or field = 'keyword') which will probably be even worse performance wise than a FIND_IN_SET().
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