add log api
Merge remote-tracking branch 'upstream/master'
bug for StatFilter merge sql
减少PreparedStatementProxyImpl的内存占用
减少内存占用
decrease memory used
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
improve wall && eval support
add testcase
refactor
decrease memory copy
decrease memory copy
decrement JdbcParameter memory used
merge
decrease JdbcParameter memory used
decrease JdbcParameter memory used
improve unpooled statement's performance
decrease memory used
bug fixed and add license