private boolean isApply(ChangeSet changeSet) {
        // 必须包含　PENDING_DROPS　不然无法在只删除列时产生变更脚本
        return (changeSet.getType() == ChangeSetType.APPLY || changeSet.getType() == ChangeSetType.PENDING_DROPS)
                && !changeSet.getChangeSetChildren().isEmpty();
    }
private boolean isApply ( ChangeSet changeSet ) { return ( changeSet . getType ( ) == ChangeSetType . APPLY || changeSet . getType ( ) == ChangeSetType . PENDING_DROPS ) && ! changeSet . getChangeSetChildren ( ) . isEmpty ( ) ; }
Return true if the changeSet is APPLY and not empty.