Fixed bug in SQL_CALC_FOUND_ROWS + LIMIT

Docs/manual.texi:
  Changelog
mysql-test/r/select_found.result:
  Test of FOUND_ROWS() bug fix
mysql-test/t/select_found.test:
  Test of FOUND_ROWS() bug fix

Docs/manual.texi

@@ -49402,6 +49402,8 @@ if the first @code{SELECT} has this option and if there is global @code{LIMIT}
 for the entire statement. For the moment, this requires using parentheses for
 individual @code{SELECT} queries within the statement.
 @item
+Fixed bug in @code{SQL_CALC_FOUND_ROWS} and LIMIT.
+@item
 Don't give an error for @code{CREATE TABLE ...(... VARCHAR(0))}.
 @item
 Fixed @code{SIGINT} and @code{SIGQUIT} problems in @file{mysql.cc} on Linux

mysql-test/r/select_found.result

@@ -66,7 +66,7 @@ a
 2
 select FOUND_ROWS();
 FOUND_ROWS()
-5
+3
 drop table t1;
 CREATE TABLE t1 (
 `id` smallint(5) unsigned NOT NULL auto_increment,
@@ -153,3 +153,19 @@ SELECT FOUND_ROWS();
 FOUND_ROWS()
 199
 drop table t1,t2;
+CREATE TABLE `t1` (
+`titre` char(80) NOT NULL default '',
+`numeropost` mediumint(8) unsigned NOT NULL auto_increment,
+`maxnumrep` int(10) unsigned NOT NULL default '0',
+PRIMARY KEY  (`numeropost`),
+KEY `maxnumrep` (`maxnumrep`)
+) TYPE=MyISAM ROW_FORMAT=FIXED;
+INSERT INTO t1 (titre,maxnumrep) VALUES
+('test1','1'),('test2','2'),('test3','3');
+SELECT SQL_CALC_FOUND_ROWS titre,numeropost,maxnumrep FROM t1 WHERE numeropost IN (1,2) ORDER BY maxnumrep DESC LIMIT 0, 1;
+titre	numeropost	maxnumrep
+test2	2	2
+SELECT FOUND_ROWS();
+FOUND_ROWS()
+2
+drop table t1;

mysql-test/t/select_found.test

@@ -68,3 +68,20 @@ SELECT SQL_CALC_FOUND_ROWS DISTINCT email FROM t2 LEFT JOIN t1  ON kid = t2.id W
 SELECT FOUND_ROWS();
 
 drop table t1,t2;
+
+#
+# Test bug when using range optimization
+#
+
+CREATE TABLE `t1` (
+  `titre` char(80) NOT NULL default '',
+  `numeropost` mediumint(8) unsigned NOT NULL auto_increment,
+  `maxnumrep` int(10) unsigned NOT NULL default '0',
+  PRIMARY KEY  (`numeropost`),
+  KEY `maxnumrep` (`maxnumrep`)
+) TYPE=MyISAM ROW_FORMAT=FIXED;
+INSERT INTO t1 (titre,maxnumrep) VALUES
+('test1','1'),('test2','2'),('test3','3');
+SELECT SQL_CALC_FOUND_ROWS titre,numeropost,maxnumrep FROM t1 WHERE numeropost IN (1,2) ORDER BY maxnumrep DESC LIMIT 0, 1;
+SELECT FOUND_ROWS();
+drop table t1;

sql/sql_select.cc

@@ -4900,12 +4900,24 @@ end_send(JOIN *join, JOIN_TAB *join_tab __attribute__((unused)),
 	JOIN_TAB *jt=join->join_tab;
 	if ((join->tables == 1) && !join->tmp_table && !join->sort_and_group
 	    && !join->send_group_parts && !join->having && !jt->select_cond &&
+	    !(jt->select && jt->select->quick) &&
 	    !(jt->table->file->table_flags() & HA_NOT_EXACT_COUNT))
 	{
 	  /* Join over all rows in table;  Return number of found rows */
+	  TABLE *table=jt->table;
+
 	  join->select_options ^= OPTION_FOUND_ROWS;
-	  jt->table->file->info(HA_STATUS_VARIABLE);
-	  join->send_records = jt->table->file->records;
+	  if (table->record_pointers ||
+	      (table->io_cache && my_b_inited(table->io_cache)))
+	  {
+	    /* Using filesort */
+	    join->send_records= table->found_records;
+	  }
+	  else
+	  {
+	    table->file->info(HA_STATUS_VARIABLE);
+	    join->send_records = table->file->records;
+	  }
 	}
 	else 
 	{