code: public Collection<ShardingExecuteGroup<StatementExecuteUnit>> getExecuteUnitGroups(final Collection<RouteUnit> routeUnits, final SQLExecutePrepareCallback callback) throws SQLException {
          return getSynchronizedExecuteUnitGroups(routeUnits, callback);
      }
docs: Get execute unit groups.
  
  @param routeUnits route units
  @param callback SQL execute prepare callback
  @return statement execute unit groups
  @throws SQLException SQL exception