I am doing some grouping in SQL with the grouping determined by a
method call (because the grouping is user-defined and quite
arbitrary). So far, so good. Are there any pitfalls that I need to
watch for?

I do not need to do this, but is it still dangerous to move a
table pointer even if one restores it?

Sincerely,

Gene Wirchenko

Computerese Irregular Verb Conjugation:
I have preferences.
You have biases.
He/She has prejudices.