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Remove the aggregate form of ts_rewrite(), since it doesn't work as desired

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if there are zero rows to aggregate over, and the API seems both conceptually
and notationally ugly anyway.  We should look for something that improves
on the tsquery-and-text-SELECT version (which is also pretty ugly but at
least it works...), but it seems that will take query infrastructure that
doesn't exist today.  (Hm, I wonder if there's anything in or near SQL2003
window functions that would help?)  Per discussion.
This commit is contained in:
Tom Lane
2007-10-24 02:24:49 +00:00
parent 07d0a370c1
commit 592c88a0d2
8 changed files with 48 additions and 214 deletions
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29
doc/src/sgml/textsearch.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/textsearch.sgml,v 1.24 2007/10/23 20:46:12 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/textsearch.sgml,v 1.25 2007/10/24 02:24:47 tgl Exp $ -->
<chapter id="textsearch">
<title id="textsearch-title">Full Text Search</title>
@ -1456,33 +1456,6 @@ SELECT ts_rewrite('a &amp; b'::tsquery, 'a'::tsquery, 'c'::tsquery);
</listitem>
</varlistentry>
<varlistentry>
<term>
<synopsis>
ts_rewrite(ARRAY[<replaceable class="PARAMETER">query</replaceable> <type>tsquery</>, <replaceable class="PARAMETER">target</replaceable> <type>tsquery</>, <replaceable class="PARAMETER">substitute</replaceable> <type>tsquery</>]) returns <type>tsquery</>
</synopsis>
</term>
<listitem>
<para>
Aggregate form. XXX if we choose not to remove this, it needs to
be documented better. Note it is not listed in
textsearch-functions-table at the moment.
<programlisting>
CREATE TABLE aliases (t tsquery PRIMARY KEY, s tsquery);
INSERT INTO aliases VALUES('a', 'c');
SELECT ts_rewrite(ARRAY['a &amp; b'::tsquery, t,s]) FROM aliases;
ts_rewrite
------------
'b' &amp; 'c'
</programlisting>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>