Merge pull request #3 from alibaba/master

update fork
mysql count语句需要添加别名
Merge pull request #4 from alibaba/master

update fork
Revert "mysql count语句需要添加别名"

This reverts commit abbf31d5d7e673fc53a6d889c8dec71319224ca7.
Merge branch 'master' of https://github.com/melin/druid
mysql count from子语句需要添加alias
Merge pull request #405 from melin/master

mysql count from子语句需要添加alias