Merge pull request #248 from wenshao/master

增强SQL Parser
Merge pull request #249 from wenshao/master

improve SQL Parser
Merge pull request #250 from wenshao/master

improve sql parser performance
Merge pull request #251 from wenshao/master

improve sql parser perforamnce
Merge pull request #252 from wenshao/master

improve proxy performance
Merge pull request #253 from wenshao/master

bug fixed for stat
Merge pull request #254 from wenshao/master

0.2.11
Merge pull request #255 from wenshao/master

0.2.12-SNAPSHOT
 Equality operator '=' is missed in eval visitor utils
Merge pull request #256 from coderplay/master

Equality operator '=' is missed in SQLEvalVisitorUtils
Merge remote-tracking branch 'upstream/master'