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Doc: clean up documentation about text search datatype limits.

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textsearch.sgml neglected to mention that the MAXSTRPOS total-length
limit applies to tsquery as well as tsvector.  It also claims that
there is a 32K limit on the total number of nodes in a tsquery, which
is wrong.  (I suspect that QueryOperator.left may once have been
int16, which would give rise to such a limit.  But it's uint32 now,
so you'd hit the 1GB varlena limit well before overflowing that.)

While at it, re-order the bullet points into an order that makes
more sense, to me anyway.

Reported-by: Claude Code (via Noah Misch)
Author: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Chao Li <li.evan.chao@gmail.com>
Discussion: https://postgr.es/m/455079.1786897319@sss.pgh.pa.us
Backpatch-through: 14
This commit is contained in:
Tom Lane
2026-08-17 18:17:51 -04:00
parent 05556bdf93
commit cce1fa9dbc
1 changed files with 9 additions and 14 deletions
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23
doc/src/sgml/textsearch.sgml
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@@ -3990,30 +3990,25 @@ Parser: "pg_catalog.default"
<para>The length of each lexeme must be less than 2 kilobytes</para>
</listitem>
<listitem>
<para>The length of a <type>tsvector</type> (lexemes + positions) must be
less than 1 megabyte</para>
</listitem>
<listitem>
<!-- TODO: number of lexemes in what? This is unclear -->
<para>The number of lexemes must be less than
2<superscript>64</superscript></para>
<para>No more than 256 positions per lexeme</para>
</listitem>
<listitem>
<para>Position values in <type>tsvector</type> must be greater than 0 and
no more than 16,383</para>
</listitem>
<listitem>
<para>The length of a <type>tsvector</type>'s data (lexemes + positions)
must be less than 1 megabyte</para>
</listitem>
<listitem>
<para>The length of a <type>tsquery</type>'s data (lexemes only)
must be less than 1 megabyte</para>
</listitem>
<listitem>
<para>The match distance in a <literal>&lt;<replaceable>N</replaceable>&gt;</literal>
(FOLLOWED BY) <type>tsquery</type> operator cannot be more than
16,384</para>
</listitem>
<listitem>
<para>No more than 256 positions per lexeme</para>
</listitem>
<listitem>
<para>The number of nodes (lexemes + operators) in a <type>tsquery</type>
must be less than 32,768</para>
</listitem>
</itemizedlist>
</para>