v		input view
pairs		pairwise rename list

Rename returns a view with columns in v renamed according to the pairs list.

set v [view {A B C} def {a b c aa bb cc}]

view $v rename {A X}

	X	B	C
0	a	b	c
1	aa	bb	cc

view $v rename {A B B A}

	B	A	C
0	a	b	c
1	aa	bb	cc

view $v rename {0 X -1 Z}

	X	B	Z
0	a	b	c
1	aa	bb	cc