In 04ac5655be I assumed that we would
never want to pass the "table_name.column_name" form to where with a
symbol. However, in Ruby 2.2 and later, you can quote symbols using the
new hash syntax, so it's a semi-reasonable thing to do if we want to
support the dot notation (which I'd rather deprecate, but that would be
too painful of a migration).
Instead we've changed the definition of "this is a table name with a
dot" to when the value associated is a hash. It would make very little
sense to write `where("table_name.column_name": { foo: :bar })` in any
scenario (other than equality for a JSON column which we don't support
through `where` in this way).
Close#24514.
714ab8cb59