tree bdc732e8afc8237c1bc0ad608c8dbbb213b3e7de
parent c6aaf091fe9ddeb9127d0292fb05c546de63d673
author Avery Pennarun <apenwarr@gmail.com> 1355036188 -0500
committer Avery Pennarun <apenwarr@gmail.com> 1355123016 -0500

Add color() aggregate function.

If you do something like
	group=date,ver;count(*),color(ver)

then the fourth column will receive a series of integers where a particular
'ver' is mapped consistently to a particular value.  This can be useful for
specifying the color field in a tree chart.