I don't understand this behavior in 12 (worked in 9.6), but:
select 'Thames', to_tsvector('John Thames');
Gives you a vector of: 'john':1 'thame':2
And searching for the full 'Thames' returns no results.
What's happening here?
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Wells Oliver
wells(dot)oliver(at)gmail(dot)com <wellsoliver(at)gmail(dot)com>