Merge pull request #615 from wenshao/master

support create/destory scheduler
Merge pull request #617 from wenshao/master

bug fixed for clone
Merge pull request #618 from wenshao/master

bug fixed for create/destroy scheduler & add testcase
improve sqlwall
Merge pull request #619 from yakolee/master

improve sqlwall
bugfix for hint
version 1.0.9
Merge pull request #620 from yakolee/master

version 1.0.9 && bugfix for hint
improve sqlwall
Merge pull request #621 from yakolee/master

improve sqlwall
Merge pull request #622 from wenshao/master

add testcase
improve sqlwall
Merge pull request #624 from yakolee/master

improve sqlwall
Revert "add testcase"
improve sqlwall
revert wallconfig
Merge pull request #627 from yakolee/master

revert wallconfig spell
Merge pull request #625 from wyx0127/revert-622-master

Revert "add testcase"