MDEV-32873 Test innodb.innodb-index-online occasionally fails

Let us wait for the completion of purge before testing the KILL of
CREATE INDEX c2d ON t1(c2), so that there will be no table handle
acquisition by a purge task before the operation is rolled back.

Also, let us make the test compatible with ./mtr --repeat,
and convert variable_value from string to integer so that any
comparisons will be performed correctly.

mysql-test/suite/innodb/r/innodb-index-online.result

+SET GLOBAL innodb_monitor_reset_all=all;
+SET GLOBAL innodb_monitor_reset_all=default;
 call mtr.add_suppression("InnoDB: Warning: Small buffer pool size");
 SET @global_innodb_file_per_table_orig = @@global.innodb_file_per_table;
 SET GLOBAL innodb_file_per_table = on;
@@ -155,6 +157,7 @@ test	t1_c2_stats	GEN_CLUST_INDEX	LAST_UPDATE	size	1	NULL	Number of pages in the
 connection con1;
 KILL QUERY @id;
 ERROR 70100: Query execution was interrupted
+SET GLOBAL innodb_max_purge_lag_wait=0;
 SET DEBUG_SYNC = 'row_log_apply_before SIGNAL c2d_created WAIT_FOR kill_done';
 CREATE INDEX c2d ON t1(c2);
 connection default;
@@ -221,13 +224,13 @@ t1	CREATE TABLE `t1` (
 ) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci STATS_PERSISTENT=1
 connection default;
 SET @merge_encrypt_0=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_merge_blocks_encrypted');
 SET @merge_decrypt_0=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_merge_blocks_decrypted');
 SET @rowlog_encrypt_0=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_rowlog_blocks_encrypted');
 connection con1;
 SET DEBUG_SYNC = 'row_log_apply_before SIGNAL c2e_created WAIT_FOR dml2_done';
@@ -274,13 +277,13 @@ name	pos
 c2	0
 c3	1
 SET @merge_encrypt_1=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_merge_blocks_encrypted');
 SET @merge_decrypt_1=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_merge_blocks_decrypted');
 SET @rowlog_encrypt_1=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_rowlog_blocks_encrypted');
 SELECT
 (@merge_encrypt_1-@merge_encrypt_0)-
@@ -320,16 +323,16 @@ ddl_pending_alter_table	0
 ddl_sort_file_alter_table	0
 ddl_log_file_alter_table	1
 SET @merge_encrypt_1=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_merge_blocks_encrypted');
 SET @merge_decrypt_1=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_merge_blocks_decrypted');
 SET @rowlog_encrypt_1=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_rowlog_blocks_encrypted');
 SET @rowlog_decrypt_1=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_rowlog_blocks_decrypted');
 connection con1;
 SET DEBUG_SYNC = 'row_log_apply_before SIGNAL c2f_created WAIT_FOR dml3_done';
@@ -405,16 +408,16 @@ ddl_sort_file_alter_table	0
 ddl_log_file_alter_table	2
 connection default;
 SET @merge_encrypt_2=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_merge_blocks_encrypted');
 SET @merge_decrypt_2=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_merge_blocks_decrypted');
 SET @rowlog_encrypt_2=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_rowlog_blocks_encrypted');
 SET @rowlog_decrypt_2=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_rowlog_blocks_decrypted');
 SELECT
 (@merge_encrypt_2-@merge_encrypt_1)-

mysql-test/suite/innodb/t/innodb-index-online.test

@@ -4,6 +4,10 @@
 --source include/have_debug_sync.inc
 --source include/no_valgrind_without_big.inc
 
+SET GLOBAL innodb_monitor_reset_all=all;
+--disable_warnings
+SET GLOBAL innodb_monitor_reset_all=default;
+--enable_warnings
 let $innodb_metrics_select=
 SELECT name, count FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE subsystem = 'ddl';
 
@@ -158,6 +162,7 @@ let $ID= `SELECT @id := CONNECTION_ID()`;
 --error ER_QUERY_INTERRUPTED
 KILL QUERY @id;
 
+SET GLOBAL innodb_max_purge_lag_wait=0;
 SET DEBUG_SYNC = 'row_log_apply_before SIGNAL c2d_created WAIT_FOR kill_done';
 --send
 CREATE INDEX c2d ON t1(c2);
@@ -209,13 +214,13 @@ SHOW CREATE TABLE t1;
 
 connection default;
 SET @merge_encrypt_0=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_merge_blocks_encrypted');
 SET @merge_decrypt_0=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_merge_blocks_decrypted');
 SET @rowlog_encrypt_0=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_rowlog_blocks_encrypted');
 connection con1;
 
@@ -254,13 +259,13 @@ INNER JOIN INFORMATION_SCHEMA.INNODB_SYS_FIELDS sf
 ON si.index_id = sf.index_id WHERE si.name = '?c2e';
 
 SET @merge_encrypt_1=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_merge_blocks_encrypted');
 SET @merge_decrypt_1=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_merge_blocks_decrypted');
 SET @rowlog_encrypt_1=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_rowlog_blocks_encrypted');
 
 SELECT
@@ -297,16 +302,16 @@ ALTER TABLE t1 COMMENT 'testing if c2e will be dropped';
 eval $innodb_metrics_select;
 
 SET @merge_encrypt_1=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_merge_blocks_encrypted');
 SET @merge_decrypt_1=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_merge_blocks_decrypted');
 SET @rowlog_encrypt_1=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_rowlog_blocks_encrypted');
 SET @rowlog_decrypt_1=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_rowlog_blocks_decrypted');
 
 connection con1;
@@ -343,16 +348,16 @@ eval $innodb_metrics_select;
 connection default;
 
 SET @merge_encrypt_2=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_merge_blocks_encrypted');
 SET @merge_decrypt_2=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_merge_blocks_decrypted');
 SET @rowlog_encrypt_2=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_rowlog_blocks_encrypted');
 SET @rowlog_decrypt_2=
-(SELECT variable_value FROM information_schema.global_status
+(SELECT CAST(variable_value AS INTEGER) FROM information_schema.global_status
 WHERE variable_name = 'innodb_encryption_n_rowlog_blocks_decrypted');
 
 SELECT