bugfix for npe
bugfix for sqlparser
Merge pull request #569 from yakolee/master

improve sql parser
add api:tryGetConnection and fillConnection
update from master
add api tryGetConnection and fill
Merge pull request #572 from yakolee/master

add api:tryGetConnection and fillConnection
fix a few spelling errors and a function name typo in SQLEvalVisitorUtils#registerBaseFunctions
Merge pull request #576 from lizhanhui/master

Fix a few spelling errors and a function name typo in SQLEvalVisitorUtils#registerBaseFunctions
compatible for early versions
Merge pull request #578 from wenshao/master

compatible for early versions
JdbcUtils getDbType support jdbc:sqlserver:
Merge pull request #579 from wenshao/master

JdbcUtils getDbType support jdbc:sqlserver:
add notFullTimeoutRetryCount support
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