Merge pull request #578 from wenshao/master

compatible for early versions
Merge pull request #579 from wenshao/master

JdbcUtils getDbType support jdbc:sqlserver:
Merge pull request #580 from wenshao/master

add notFullTimeoutRetryCount support
improve sqlwall
Merge pull request #583 from yakolee/master

improve sqlwall
1.fix KEY using btree not fit mysql 5.5 syntax,2.fix ALTER TABLE COLLATE bug,3.modify parse error info,like mysql
improve sql parser
Merge pull request #585 from yakolee/master

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

support oracle connect_by_root
fix MySqlSchemaStatVisitor think index as column
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
with more space ,effect the test. reduce the space
Merge remote-tracking branch 'upstream/master'
Merge pull request #590 from bucketli/master

多加一个空格导致有些测试用例过不去
change log.error to log.debug