Why Sequel::Dataset#exists returns result as String? Is it desing
feature or inattentiveness?
For example we can't do this directly:
existsA = DB[some query].exists
existsB = DB[some query].exists
DB.select(existsA, existsB)
Or this:
exitsA.as(:is_a_exists)
There are, of course, workaround, we can call exists.lit and then
previous examples will work, but I think exists should return literal
or something like this directly.
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