MDEV-20531: innodb.temporary_table_optimisation fails

Try to use more deterministic floating-point operations.
Apparently, 2.2 > 2.2 wrongly holds on many platforms, but
not ppc64le on the compiler used on Red Had Enterprise Linux 8.
The reason could be an infinite binary presentation:
2.2 = 0b10.001100110011…

With t1_f = 2.5 = 0b10.1, t1_f > 2.5 would no longer hold on AMD64.
Let us replace the 2.2 with 2.5 and compare t1_f >= 2.5 in order to
get more consistent results across all platforms.

mysql-test/suite/innodb/r/temporary_table_optimization.result

@@ -112,7 +112,7 @@ count(*)
 drop table t1;
 drop procedure populate_t1;
 create temporary table t1 (t1_i int, t1_f float) engine = innodb;
-insert into t1 values (1, 1.1), (2, 2.2), (3, 2.2), (4, 4.4);
+insert into t1 values (1, 1.1), (2, 2.5), (3, 2.5), (4, 4.4);
 explain select * from t1 where t1_i = 1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	4	Using where
@@ -124,22 +124,22 @@ select * from t1 where t1_i = 1;
 t1_i	t1_f
 1	1.1
 alter table t1 add unique index sec_index(t1_f);
-ERROR 23000: Duplicate entry '2.2' for key 'sec_index'
+ERROR 23000: Duplicate entry '2.5' for key 'sec_index'
 alter table t1 add index sec_index(t1_f);
-explain select * from t1 where t1_f > 2.2;
+explain select * from t1 where t1_f >= 2.5;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	sec_index	NULL	NULL	NULL	4	Using where
-select * from t1 where t1_f > 2.2;
+select * from t1 where t1_f >= 2.5;
 t1_i	t1_f
-2	2.2
-3	2.2
+2	2.5
+3	2.5
 4	4.4
 alter table t1 add column (t1_c char(10));
 select * from t1;
 t1_i	t1_f	t1_c
 1	1.1	NULL
-2	2.2	NULL
-3	2.2	NULL
+2	2.5	NULL
+3	2.5	NULL
 4	4.4	NULL
 insert into t1 values (5, 5.5, 'krunal');
 alter table t1 drop column t1_f;
@@ -150,7 +150,7 @@ t1	CREATE TEMPORARY TABLE `t1` (
   `t1_c` char(10) DEFAULT NULL,
   UNIQUE KEY `pri_index` (`t1_i`)
 ) ENGINE=InnoDB DEFAULT CHARSET=latin1
-select * from t1 where t1_f > 2.2;
+select * from t1 where t1_f >= 2.5;
 ERROR 42S22: Unknown column 't1_f' in 'where clause'
 alter table t1 add index sec_index2(t1_c), algorithm=inplace;
 ERROR 0A000: ALGORITHM=INPLACE is not supported for this operation. Try ALGORITHM=COPY

mysql-test/suite/innodb/t/temporary_table_optimization.test

@@ -100,7 +100,7 @@ drop procedure populate_t1;
 # 3. Alter of temp-table.
 #
 create temporary table t1 (t1_i int, t1_f float) engine = innodb;
-insert into t1 values (1, 1.1), (2, 2.2), (3, 2.2), (4, 4.4);
+insert into t1 values (1, 1.1), (2, 2.5), (3, 2.5), (4, 4.4);
 #
 explain select * from t1 where t1_i = 1;
 alter table t1 add unique index pri_index(t1_i);
@@ -110,8 +110,8 @@ select * from t1 where t1_i = 1;
 --error ER_DUP_ENTRY
 alter table t1 add unique index sec_index(t1_f);
 alter table t1 add index sec_index(t1_f);
-explain select * from t1 where t1_f > 2.2;
-select * from t1 where t1_f > 2.2;
+explain select * from t1 where t1_f >= 2.5;
+select * from t1 where t1_f >= 2.5;
 #
 alter table t1 add column (t1_c char(10));
 select * from t1;
@@ -120,7 +120,7 @@ insert into t1 values (5, 5.5, 'krunal');
 alter table t1 drop column t1_f;
 show create table t1;
 --error ER_BAD_FIELD_ERROR
-select * from t1 where t1_f > 2.2;
+select * from t1 where t1_f >= 2.5;
 #
 --error ER_ALTER_OPERATION_NOT_SUPPORTED
 alter table t1 add index sec_index2(t1_c), algorithm=inplace;