Returns the string form of this GroupBy.


The string form of this GroupBy.

The GroupBy format is:
CopyC#
if no depth has been set.

"<i>grouping-key-name</i>"
The format:
CopyC#
is used if depth has been specified.
"<i>grouping-key-name</i>:<i>depth</i>"

The string:
CopyC#
is returned if the grouping key is a dimension named Region
with a grouping level of 2 (that is, two levels below the root of
the dimension hierarchy).

Region:2