and
indexed in the tsvector column. There is a lexeme returned for the
word becuase in the configuration mapping table, we specify words
to be used from the 'en_ispell' dictionary first, but as a fallback
to use the 'en_stem' dictionary. Therefore a lexeme is not returned
from en_ispell, but is returned from en_stem, and added to the
tsvector.</p>
<pre>
 SELECT to_tsvector('learning tsearch is like going to computer school');
                                to_tsvector
        ------------------------------