tree 3cc4a5a991ad20bb8ea81495d070c11841e7d788
parent 5d2596ae6c6eea3134d74fe23b3cc78afbecfa2e
author Haoming Zhang <zhm1993zhm@gmail.com> 1498165773 -0700
committer Haoming Zhang <zhm1993zhm@gmail.com> 1499468050 -0700

add map to store columns