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Polish the documentation concerning phrase text search.
Fix grammar, improve examples, etc. I did not attempt to document the current behavior concerning distance-zero matches, because I think that's broken and needs to change, so I'm not going to use up brain cells figuring out how to explain how it works now. One way or the other, there's still more to write here.
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‎doc/src/sgml/datatype.sgml

Lines changed: 12 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -3923,11 +3923,18 @@ SELECT to_tsvector('english', 'The Fat Rats');
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<para>
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A <type>tsquery</type> value stores lexemes that are to be
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searched for, and combines them honoring the Boolean operators
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<literal>&amp;</literal> (AND), <literal>|</literal> (OR),
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<literal>!</> (NOT) and <literal>&lt;-&gt;</> (FOLLOWED BY) phrase search
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operator. Parentheses can be used to enforce grouping
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of the operators:
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searched for, and can combine them using the Boolean operators
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<literal>&amp;</literal> (AND), <literal>|</literal> (OR), and
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<literal>!</> (NOT), as well as the phrase search operator
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<literal>&lt;-&gt;</> (FOLLOWED BY). There is also a variant
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<literal>&lt;<replaceable>N</>&gt;</literal> of the FOLLOWED BY
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operator, where <replaceable>N</> is an integer constant that
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specifies a maximum distance between the two lexemes being searched
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for. <literal>&lt;-&gt;</> is equivalent to <literal>&lt;1&gt;</>.
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</para>
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<para>
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Parentheses can be used to enforce grouping of the operators:
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<programlisting>
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SELECT 'fat &amp; rat'::tsquery;

‎doc/src/sgml/func.sgml

Lines changed: 20 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -9081,10 +9081,11 @@ CREATE TYPE rainbow AS ENUM ('red', 'orange', 'yellow', 'green', 'blue', 'purple
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<table id="textsearch-operators-table">
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<title>Text Search Operators</title>
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<tgroup cols="4">
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<tgroup cols="5">
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<thead>
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<row>
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<entry>Operator</entry>
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<entry>Return Type</entry>
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<entry>Description</entry>
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<entry>Example</entry>
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<entry>Result</entry>
@@ -9093,54 +9094,63 @@ CREATE TYPE rainbow AS ENUM ('red', 'orange', 'yellow', 'green', 'blue', 'purple
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<tbody>
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<row>
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<entry> <literal>@@</literal> </entry>
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<entry><type>boolean</></entry>
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<entry><type>tsvector</> matches <type>tsquery</> ?</entry>
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<entry><literal>to_tsvector('fat cats ate rats') @@ to_tsquery('cat &amp; rat')</literal></entry>
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<entry><literal>t</literal></entry>
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</row>
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<row>
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<entry> <literal>@@@</literal> </entry>
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<entry><type>boolean</></entry>
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<entry>deprecated synonym for <literal>@@</></entry>
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<entry><literal>to_tsvector('fat cats ate rats') @@@ to_tsquery('cat &amp; rat')</literal></entry>
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<entry><literal>t</literal></entry>
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</row>
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<row>
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<entry> <literal>||</literal> </entry>
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<entry><type>tsvector</></entry>
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<entry>concatenate <type>tsvector</>s</entry>
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<entry><literal>'a:1 b:2'::tsvector || 'c:1 d:2 b:3'::tsvector</literal></entry>
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<entry><literal>'a':1 'b':2,5 'c':3 'd':4</literal></entry>
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</row>
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<row>
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<entry> <literal>&amp;&amp;</literal> </entry>
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<entry><type>tsquery</></entry>
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<entry>AND <type>tsquery</>s together</entry>
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<entry><literal>'fat | rat'::tsquery &amp;&amp; 'cat'::tsquery</literal></entry>
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<entry><literal>( 'fat' | 'rat' ) &amp; 'cat'</literal></entry>
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</row>
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<row>
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<entry> <literal>||</literal> </entry>
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<entry><type>tsquery</></entry>
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<entry>OR <type>tsquery</>s together</entry>
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<entry><literal>'fat | rat'::tsquery || 'cat'::tsquery</literal></entry>
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<entry><literal>( 'fat' | 'rat' ) | 'cat'</literal></entry>
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</row>
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<row>
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<entry> <literal>!!</literal> </entry>
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<entry><type>tsquery</></entry>
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<entry>negate a <type>tsquery</></entry>
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<entry><literal>!! 'cat'::tsquery</literal></entry>
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<entry><literal>!'cat'</literal></entry>
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</row>
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<row>
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<entry> <literal>&lt;-&gt;</literal> </entry>
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<entry><type>tsquery</></entry>
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<entry><type>tsquery</> followed by <type>tsquery</></entry>
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<entry><literal>to_tsquery('fat') &lt;-&gt; to_tsquery('rat')</literal></entry>
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<entry><literal>'fat' &lt;-&gt; 'rat'</literal></entry>
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</row>
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<row>
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<entry> <literal>@&gt;</literal> </entry>
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<entry><type>boolean</></entry>
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<entry><type>tsquery</> contains another ?</entry>
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<entry><literal>'cat'::tsquery @&gt; 'cat &amp; rat'::tsquery</literal></entry>
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<entry><literal>f</literal></entry>
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</row>
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<row>
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<entry> <literal>&lt;@</literal> </entry>
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<entry><type>boolean</></entry>
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<entry><type>tsquery</> is contained in ?</entry>
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<entry><literal>'cat'::tsquery &lt;@ 'cat &amp; rat'::tsquery</literal></entry>
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<entry><literal>t</literal></entry>
@@ -9245,7 +9255,8 @@ CREATE TYPE rainbow AS ENUM ('red', 'orange', 'yellow', 'green', 'blue', 'purple
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<literal><function>phraseto_tsquery(<optional> <replaceable class="PARAMETER">config</> <type>regconfig</> , </optional> <replaceable class="PARAMETER">query</> <type>text</type>)</function></literal>
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</entry>
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<entry><type>tsquery</type></entry>
9248-
<entry>produce <type>tsquery</> ignoring punctuation</entry>
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<entry>produce <type>tsquery</> that searches for a phrase,
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ignoring punctuation</entry>
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<entry><literal>phraseto_tsquery('english', 'The Fat Rats')</literal></entry>
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<entry><literal>'fat' &lt;-&gt; 'rat'</literal></entry>
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</row>
@@ -9400,7 +9411,8 @@ CREATE TYPE rainbow AS ENUM ('red', 'orange', 'yellow', 'green', 'blue', 'purple
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<literal><function>ts_rewrite(<replaceable class="PARAMETER">query</replaceable> <type>tsquery</>, <replaceable class="PARAMETER">target</replaceable> <type>tsquery</>, <replaceable class="PARAMETER">substitute</replaceable> <type>tsquery</>)</function></literal>
94019412
</entry>
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<entry><type>tsquery</type></entry>
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<entry>replace target with substitute within query</entry>
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<entry>replace <replaceable>target</> with <replaceable>substitute</>
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within query</entry>
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<entry><literal>ts_rewrite('a &amp; b'::tsquery, 'a'::tsquery, 'foo|bar'::tsquery)</literal></entry>
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<entry><literal>'b' &amp; ( 'foo' | 'bar' )</literal></entry>
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</row>
@@ -9419,7 +9431,9 @@ CREATE TYPE rainbow AS ENUM ('red', 'orange', 'yellow', 'green', 'blue', 'purple
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<literal><function>tsquery_phrase(<replaceable class="PARAMETER">query1</replaceable> <type>tsquery</>, <replaceable class="PARAMETER">query2</replaceable> <type>tsquery</>)</function></literal>
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</entry>
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<entry><type>tsquery</type></entry>
9422-
<entry>implementation of <literal>&lt;-&gt;</> (FOLLOWED BY) operator</entry>
9434+
<entry>make query that searches for <replaceable>query1</> followed
9435+
by <replaceable>query2</> (same as <literal>&lt;-&gt;</>
9436+
operator)</entry>
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<entry><literal>tsquery_phrase(to_tsquery('fat'), to_tsquery('cat'))</literal></entry>
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<entry><literal>'fat' &lt;-&gt; 'cat'</literal></entry>
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</row>
@@ -9428,7 +9442,8 @@ CREATE TYPE rainbow AS ENUM ('red', 'orange', 'yellow', 'green', 'blue', 'purple
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<literal><function>tsquery_phrase(<replaceable class="PARAMETER">query1</replaceable> <type>tsquery</>, <replaceable class="PARAMETER">query2</replaceable> <type>tsquery</>, <replaceable class="PARAMETER">distance</replaceable> <type>integer</>)</function></literal>
94299443
</entry>
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<entry><type>tsquery</type></entry>
9431-
<entry>phrase-concatenate with distance</entry>
9445+
<entry>make query that searches for <replaceable>query1</> followed by
9446+
<replaceable>query2</> at maximum distance <replaceable>distance</></entry>
94329447
<entry><literal>tsquery_phrase(to_tsquery('fat'), to_tsquery('cat'), 10)</literal></entry>
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<entry><literal>'fat' &lt;10&gt; 'cat'</literal></entry>
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</row>

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