tree c56e17d02b242eb75a87725d34e870f11cd36e3a
parent 1bb955bca32668b40cc6ea6692f971ce66ef905c
author Hao Zhu <haozhu233@gmail.com> 1523729986 -0400
committer Hao Zhu <haozhu233@gmail.com> 1523729986 -0400

add width_min, width_max to column_spec