improved sql parser for sqlserver, support for xml clause
Merge pull request #714 from wenshao/master

improved sql parser for sqlserver, support for xml clause, for browse
improved sql parser for postgresql
Merge pull request #715 from wenshao/master

improved sql parser for postgresql
improved sql parser for postgresql
Merge pull request #716 from wenshao/master

improved sql parser for postgresql
improved sql parser for postgresql
Merge pull request #717 from wenshao/master

improved sql parser for postgresql