Don't write rows in MyISAM tables when using count(distinct)

Don't read MyISAM header when running without locking


include/myisam.h:
  Don't read header when running without locking.
myisam/mi_locking.c:
  Don't update changed flag for temporary files.
myisam/mi_open.c:
  Don't read header when running without locking.
myisam/mi_static.c:
  Don't read header when running without locking.
sql/item_sum.cc:
  Don't write rows in MyISAM tables when using count(distinct)
sql/mysqld.cc:
  Don't read MyISAM header when running without locking.
  Remove -Sg option.
sql/sql_analyse.h:
  Remove duplicate header.
sql/sql_select.cc:
  Cleaned up prototypes.
  Don't write rows to count(DISTINCT) MyISAM tables.
sql/sql_select.h:
  Cleaned up prototypes.
sql/table.h:
  A
BitKeeper/etc/logging_ok:
  Logging to logging@openlogging.org accepted

1 files changed, 20 insertions, 0 deletions

diff --git a/mysql-test/t/select_found.test b/mysql-test/t/select_found.test
new file mode 100644
index 00000000000..d86ef1e0907
--- /dev/null
+++ b/mysql-test/t/select_found.test
@@ -0,0 +1,20 @@
+#
+# Testing of found_rows()
+#
+
+drop table if exists t1;
+create table t1 (a int not null auto_increment, b int not null, primary key(a));
+insert into t1 (b) values (2),(3),(5),(5),(5),(6),(7),(9);
+select SQL_CALC_FOUND_ROWS * from t1;
+select found_rows();
+select SQL_CALC_FOUND_ROWS * from t1 limit 1;
+select found_rows();
+select SQL_CALC_FOUND_ROWS * from t1 order by b desc limit 1;
+select found_rows();
+select SQL_CALC_FOUND_ROWS distinct b from t1 limit 1;
+select found_rows();
+select SQL_CALC_FOUND_ROWS b,count(*) as c from t1 group by b order by c limit 1;
+select found_rows();
+select SQL_CALC_FOUND_ROWS * from t1 left join t1 as t2 on (t1.b=t2.a) limit 2,1;
+select found_rows(); 
+drop table t1;