Adapt a test from MySQL

mysql-test/suite/innodb/include/innodb_isolation_selects.inc

+# These same selects are used many times in innodb_isolation.test
+
+--echo ########## innodb_isolation_selects.inc ##########
+SELECT * FROM t1;
+SELECT COUNT(*) FROM t1;
+SELECT COUNT(c1) FROM t1;
+SELECT COUNT(c2) FROM t1;        # Uses secondary index k2
+SELECT COUNT(c3) FROM t1;        # Uses clustered index
+SELECT SUM(c1) FROM t1;          # Uses secondary index
+SELECT SUM(c2) FROM t1;          # Uses secondary index
+SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1; # Uses clustered index
+SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
+SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
+SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t1);
+--echo ###############################################