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Document that text search comparisons happen after text search

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configuration rules.

Erik Rijkers
This commit is contained in:
Bruce Momjian 2011-02-18 22:39:17 -05:00
parent 82220e8832
commit 5bba4948eb
1 changed files with 22 additions and 1 deletions
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23
doc/src/sgml/datatype.sgml
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@ -3847,7 +3847,28 @@ SELECT 'super:*'::tsquery;
'super':*
</programlisting>
This query will match any word in a <type>tsvector</> that begins
with <quote>super</>.
with <quote>super</>.
</para>
<para>
Note that text search configuration processing happens before
comparisons, which means this comparison returns <literal>true</>:
<programlisting>
SELECT to_tsvector( 'postgraduate' ) @@ to_tsquery( 'postgres:*' );
?column?
----------
t
(1 row)
</programlisting>
because <literal>postgres</> gets stemmed to <literal>postgr</>:
<programlisting>
SELECT to_tsquery('postgres:*');
to_tsquery
------------
'postgr':*
(1 row)
</programlisting>
which then matches <literal>postgraduate</>.
</para>
<para>