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via GitHub by dahai2016
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com.alibaba.druid.sql.ast.expr.SQLPropertyExpr cannot be cast to com.alibaba.druid.sql.dialect.mysql.ast.expr.MySqlSelectGroupByExpr
java.lang.ClassCastException: com.alibaba.druid.sql.ast.expr.SQLPropertyExpr cannot be cast to com.alibaba.druid.sql.dialect.mysql.ast.expr.MySqlSelectGroupByExpr	at org.opencloudb.parser.druid.impl.DruidSelectParser.buildGroupByCols(DruidSelectParser.java:559)	at org.opencloudb.parser.druid.impl.DruidSelectParser.parseAggGroupCommon(DruidSelectParser.java:178)	at org.opencloudb.parser.druid.impl.DruidSelectSqlServerParser.parseOrderAggGroupSqlServer(DruidSelectSqlServerParser.java:81)	at org.opencloudb.parser.druid.impl.DruidSelectSqlServerParser.sqlserverParse(DruidSelectSqlServerParser.java:72)	at org.opencloudb.parser.druid.impl.DruidSelectSqlServerParser.statementParse(DruidSelectSqlServerParser.java:39)	at org.opencloudb.parser.druid.impl.DefaultDruidParser.parser(DefaultDruidParser.java:63)	at org.opencloudb.route.impl.DruidMycatRouteStrategy.routeNormalSqlWithAST(DruidMycatRouteStrategy.java:64)	at org.opencloudb.route.impl.AbstractRouteStrategy.route(AbstractRouteStrategy.java:76)	at org.opencloudb.route.RouteService.route(RouteService.java:133)	at org.opencloudb.server.ServerConnection.routeEndExecuteSQL(ServerConnection.java:227)	at org.opencloudb.server.ServerConnection.execute(ServerConnection.java:175)	at org.opencloudb.server.handler.SelectHandler.handle(SelectHandler.java:106)	at org.opencloudb.server.ServerQueryHandler.query(ServerQueryHandler.java:77)	at org.opencloudb.net.FrontendConnection.query(FrontendConnection.java:308)	at org.opencloudb.net.handler.FrontendCommandHandler.handle(FrontendCommandHandler.java:71)	at org.opencloudb.net.FrontendConnection.rawHandle(FrontendConnection.java:435)	at org.opencloudb.net.FrontendConnection.handle(FrontendConnection.java:417)	at org.opencloudb.net.AbstractConnection.onReadData(AbstractConnection.java:313)	at org.opencloudb.net.NIOSocketWR.asynRead(NIOSocketWR.java:186)	at org.opencloudb.net.AbstractConnection.asynRead(AbstractConnection.java:274)	at org.opencloudb.net.NIOReactor$RW.run(NIOReactor.java:100)