Function ceil() rounds up a given number to its ceil, namely returns the smallest integer that is no less than the number.
ceil()
Arguments：
Returns：
Example: Round up each row of an alias
UQLuncollect [1, -2.5, 3.7] as a return ceil(a)
uncollect [1, -2.5, 3.7] as a return ceil(a)
Result1 -2 4
1 -2 4
