Answer by shA.t for Convert date in date list condition to list of date ranges

I'm agree with second suggestion of RolandoMySQLDBA answer that using UNION instead of OR makes the seeking of the results too faster, And also we know:

The default behavior for UNION is that duplicate rows are removed from the result. The optional DISTINCT keyword has no effect other than the default because it also specifies duplicate-row removal. With the optional ALL keyword, duplicate-row removal does not occur and the result includes all matching rows from all the SELECT statements.

And as your requirement I think your dates are in a separate sequence that will not make any duplicate row, So, for avoiding that duplicate-row removal that contains a hidden order by and etc. within it, I suggest you to use UNION ALL instead of UNION, like this:

SELECT * FROM table1 WHERE (column >= $date1 AND column < $date1 + interval 1 day)UNION ALLSELECT * FROM table1 WHERE (column >= $date2 AND column < $date2 + interval 1 day)UNION ALL...