Variable custom mysql with 5.4

Hi all,

Just to know before update to the grafana 5.4.0, i had my variable custom mysql work well
exemple in my query : (date(climbing_time) != ‘2018-11-01’)

now i update my grafana and my query didn’t work…
i had to change my query and put double quote instead of simple quote
(date(climbing_time) != “2018-11-01”)

that’s normal or it’s only a bug from the grafana 4.0 ?
and i noticed that the refresh when we change a variable it’s not take into account each time. i had to delete my variable to create a new one for my dashboard take into account the new query