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Diffstat (limited to 'mysql-test/main/system_time_debug.test')
| -rw-r--r-- | mysql-test/main/system_time_debug.test | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/mysql-test/main/system_time_debug.test b/mysql-test/main/system_time_debug.test new file mode 100644 index 00000000..040b4c30 --- /dev/null +++ b/mysql-test/main/system_time_debug.test @@ -0,0 +1,16 @@ +source include/have_debug.inc; +# +# MDEV-20079 When setting back the system time while mysqld is running, NOW() and UNIX_TIMESTAMP() results get stuck +# +set @old_dbug=@@debug_dbug; + +# because NOW() is taken at the beginning of the query and sysdate() is the actual +# time when sysdate() was evaluated, they don't necessarily have to be equal. +# but hopefully they're less than within a minute from each other. +select timestampdiff(minute,now(),sysdate()) as 'must be 0', (unix_timestamp(sysdate()) - unix_timestamp()) div 60 as 'must be 0'; +set @@debug_dbug='+d,system_time_plus_one_hour'; +select timestampdiff(minute,now(),sysdate()) as 'must be 0', (unix_timestamp(sysdate()) - unix_timestamp()) div 60 as 'must be 0'; +set @@debug_dbug='+d,system_time_minus_one_hour:-d,system_time_plus_one_hour'; +select timestampdiff(minute,now(),sysdate()) as 'must be 0', (unix_timestamp(sysdate()) - unix_timestamp()) div 60 as 'must be 0'; +set @@debug_dbug=@old_dbug; +select timestampdiff(minute,now(),sysdate()) as 'must be 0', (unix_timestamp(sysdate()) - unix_timestamp()) div 60 as 'must be 0'; |