rails/rails — pull request #16562 by arthurnn (2014-08-19 17:08:05+00:00)
Title: Add missing AS require

`strip_heredoc` method is defined on active_support/core_ext/string.
https://github.com/rails/rails/blob/ea3ba34506c72d636096245016b5ef9cfe27c566/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb#L64

review @rafaelfranca @sgrif