From eb6af016fc04392c41106ac866072914bf66ecd0 Mon Sep 17 00:00:00 2001
From: Robert Haas <rhaas@postgresql.org>
Date: Fri, 27 Jan 2012 12:40:37 -0500
Subject: [PATCH] Document that COUNT(*) might not need a seq scan any more.

Noted by Josh Kupershmidt.
---
 doc/src/sgml/func.sgml | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 219ba9abf3..ec14004084 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -11102,8 +11102,10 @@ SELECT b1 = ANY((SELECT b2 FROM t2 ...)) FROM t1 ...;
 <programlisting>
 SELECT count(*) FROM sometable;
 </programlisting>
-    will be executed by <productname>PostgreSQL</productname> using a
-    sequential scan of the entire table.
+    will require effort proportional to the size of the table:
+    <productname>PostgreSQL</productname> will need to scan either the
+    entire table or the entirety of an index which includes all rows in
+    the table.
    </para>
   </note>
 
-- 
2.40.0