[erlang-questions] Mnesia - select with placeholder in table key

[John Doe]

If I use select when the key is tuple with placeholders, something
like this (taken from erlang docs and changed a bit):

MatchHead = #person{name = {'$1', "K", "Jameson"}, sex = '$2', _ = '_'},

Result = '$2',

mnesia:select(Tab,[{MatchHead, [], [Result]}])

 where name is the table key

will mnesia do full table scan in this case? Or it will be smarter and
select all records with key matching {_, "K", "Jameson"} using index
somehow?
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