support oracle connect_by_root
Merge pull request #587 from yakolee/master

support oracle connect_by_root
Merge pull request #588 from bucketli/master

1.fix KEY using btree not fit mysql 5.5 syntax,2.fix ALTER TABLE COLLATE...
bugfix for order by view
Merge pull request #589 from yakolee/master

bugfix for order by view
Merge remote-tracking branch 'upstream/master'