[doc], [minor]. Update docstring of group by rewrite. #7111
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Which issue does this PR close?
Closes #.
Rationale for this change
As discussed in the link, current documentation for group by rewrite is missing. And rationale for it was not clear. This PR updates the docstring of the
get_updated_group_by_exprsfunction such that adds its usage, and its motivation is more clear.What changes are included in this PR?
Are these changes tested?
Are there any user-facing changes?