v		input view
col		subview column reference

Ungroup "flattens" a view by expanding all entries in the col subview column. Rows with empty subviews will not appear in the result.

set v [view {A B} def {a 1 b 2 c 5 b 3}]

view $v group A G

	A	G
0	a	B 0 1
1	b	B 0 2 1 3
2	c	B 0 5

view $v group A G | ungroup G

	A	B
0	a	1
1	b	2
2	b	3
3	c	5