如下worklog列出来的功能将在未来某个版本被废弃，因为大部分不符合SQL标准，或者用处不大且会引起用户困惑。如果您的应用依赖于某个功能，需要尽快改掉，以避免在未来升级版本时出现语法错误。
WL#12615: Deprecate SQL_CALC_FOUND_ROWS and FOUND_ROWS
WL#12595: Deprecate the ability to specify number of digits for floating point types
WL#12575: Deprecate AUTO_INCREMENT on DOUBLE and FLOAT
WL#13070: Deprecate && (resp. ||, !) as synonym for AND (OR, NOT) in SQL statements
WL#12391: Deprecate unsigned attribute for DECIMAL and FLOAT data types
WL#13127: Deprecate integer display width and ZEROFILL option
WL#13068: Deprecate BINARY keyword for specifying _bin collations
