CHANGE MASTER TO MASTER_DELAY = XXX only accepts a numeric value not an experession

Seen on 10.3.15.

Maybe not a big thing but it is somewhat surprising. I could not set the replication delay using MASTER_DELAY = xxx with an expression. It has to be a numeric value. The docs do say this but usually where a numeric value is allowed an expression can be used.

In this particular case I wanted to set a 24 hour delay which is easy to express as 24 * 60 * 60, but that did not work.

Suggestion would be to allow for a numeric expression and then use the value that is derived from that as now.