Merge pull request #12 from databasesystem/gz_branch

test
insert data
Merge pull request #11 from databasesystem/wq_branch

the whole project
Merge remote-tracking branch 'origin/master' into gz_branch
some update
Merge pull request #13 from databasesystem/wq_branch

some update
Merge remote-tracking branch 'origin/master' into gz_branch
comment