Table Store GetRangeRequest ColumnCondition filter

能力有限第一次接触实在看不懂GetRangeRequest ColumnCondition filter要怎么去定义
var postData = messages.GetRangeRequest.encode(

    {
        table_name: "XXX",
        direction: messages.Direction.FORWARD,
        columns_to_get:[
            "XXX",
            "XXX"
        ],
        inclusive_start_primary_key: [
            {
                name: "XXX",
                value: {
                    type: messages.ColumnType.STRING,
                    v_string:'1369785565938'
                }
            },
            ...
        ],
        exclusive_end_primary_key: [
            {
                name: "XXX",
                value: {
                    type: messages.ColumnType.STRING,
                    v_string:'1570021527758'
                }
            },
            ...
        ],
        filter:{
            type:messages.ColumnConditionType.CCT_RELATION,
            condition: new Buffer(JSON.stringify({
                combinator:messages.ComparatorType.CT_EQUAL,
                column_name:"type",
                column_value:{
                    type:messages.ColumnType.STRING,
                    v_string:"error"
                },
                pass_if_missing:true
            }))
        }
    }
);

官网文档解释：
condition

类型: bytes
描述: CompositeCondition或者 RelationCondition类型的条件语句序列化后的二进制数据。

这句实在不解，导致运行报错：
OTSParameterInvalid!Failed to parse column condition.
求助，万分感激！