add grant schema
Merge remote-tracking branch 'origin/v0.2' into zhuqihan
modify alter dbproperties change null to not null
modify alterFileSplit but not successfully
alter filesplitby
Merge remote-tracking branch 'origin/v0.2' into zhuqihan
alter create view sucessfully
alterFIlesplitedBy have some bugs commit to let Zjw merge my code.
modify alterSplitedBy successfully
modify rename table columnname if the column is the one which table splited by then we can't rename it
Merge remote-tracking branch 'origin/v0.2' into zhuqihan
Merge remote-tracking branch 'origin/zhuqihan' into v0.2, OK