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Doc: improve documentation of websearch_to_tqsuery().

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It wasn't totally clear about punctuation other than what's
specified being ignored.

Pavel Borisov and Tom Lane

Discussion: https://postgr.es/m/CALT9ZEFsBdsogVjG40Z4KfM1Um=wj1FE9hJ00GK3oVfzz0sFNg@mail.gmail.com
This commit is contained in:
Tom Lane 2020-04-26 11:45:54 -04:00
parent f057980149
commit 459f4076c8
2 changed files with 20 additions and 11 deletions
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11
doc/src/sgml/func.sgml
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@ -11381,11 +11381,12 @@ CREATE TYPE rainbow AS ENUM ('red', 'orange', 'yellow', 'green', 'blue', 'purple
<replaceable>query</replaceable> <type>text</type> )
<returnvalue>tsquery</returnvalue>
<?br?>
Converts text to a <type>tsquery</type>, normalizing words according to
the specified or default configuration. Quoted word sequences are
converted to phrase tests, and the word <quote>or</quote> is
understood as producing an OR operator. This approximates the
behavior of some common web search tools.
Converts text to a <type>tsquery</type>, normalizing words according
to the specified or default configuration. Quoted word sequences are
converted to phrase tests. The word <quote>or</quote> is understood
as producing an OR operator, and a dash produces a NOT operator;
other punctuation is ignored.
This approximates the behavior of some common web search tools.
<?br?>
<literal>websearch_to_tsquery('english', '"fat rat" or cat dog')</literal>
<returnvalue>'fat' &lt;-&gt; 'rat' | 'cat' &amp; 'dog'</returnvalue>

20
doc/src/sgml/textsearch.sgml
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@ -913,7 +913,7 @@ SELECT plainto_tsquery('english', 'The Fat &amp; Rats:C');
'fat' &amp; 'rat' &amp; 'c'
</screen>
Here, all the input punctuation was discarded as being space symbols.
Here, all the input punctuation was discarded.
</para>
<indexterm>
@ -969,16 +969,16 @@ websearch_to_tsquery(<optional> <replaceable class="parameter">config</replaceab
syntax in which simple unformatted text is a valid query.
Unlike <function>plainto_tsquery</function>
and <function>phraseto_tsquery</function>, it also recognizes certain
operators. Moreover, this function should never raise syntax errors,
operators. Moreover, this function will never raise syntax errors,
which makes it possible to use raw user-supplied input for search.
The following syntax is supported:
<itemizedlist spacing="compact" mark="bullet">
<listitem>
<para>
<literal>unquoted text</literal>: text not inside quote marks will be
converted to terms separated by <literal>&amp;</literal> operators, as
if processed by
<function>plainto_tsquery</function>.
if processed by <function>plainto_tsquery</function>.
</para>
</listitem>
<listitem>
@ -990,18 +990,26 @@ websearch_to_tsquery(<optional> <replaceable class="parameter">config</replaceab
</listitem>
<listitem>
<para>
<literal>OR</literal>: logical or will be converted to
<literal>OR</literal>: the word <quote>or</quote> will be converted to
the <literal>|</literal> operator.
</para>
</listitem>
<listitem>
<para>
<literal>-</literal>: the logical not operator, converted to the
<literal>-</literal>: a dash will be converted to
the <literal>!</literal> operator.
</para>
</listitem>
</itemizedlist>
Other punctuation is ignored. So
like <function>plainto_tsquery</function>
and <function>phraseto_tsquery</function>,
the <function>websearch_to_tsquery</function> function will not
recognize <type>tsquery</type> operators, weight labels, or prefix-match
labels in its input.
</para>
<para>
Examples:
<screen>