您能否在一个Hive查询中将一个结构附加到collect_list返回的结构数组的末尾？

Question

有关Hive中的collect_list UDAF的更多信息： https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF#LanguageManualUDF-Built-inAggregateFunctions(UDAF)

select
    'a' as A
    ,collect_list(struct(table1.item1,table1.item2,table1.item3)) --Array
            ||struct(table2.item1,table2.item2,table2.item3) --Struct 1
            ||struct(table3.item1,table3.item2,table3.item3) --Struct 2 
        as B
from
    table1 
join
    table2
on
    table1.thing = table2.thing
join
    table3
on
    table1.thing = table3.thing
group by
    'a'
    ,table2.item1
    ,table2.item2
    ,table2.item3
    ,table3.item1
    ,table3.item2
    ,table3.item3

Array: (returned from collect_list)
    [{table1.item1,table1.item2,table1.item3}    --structA
    ,{table1.item1,table1.item2,table1.item3}]   --structB

Struct 1:
    {table2.item1,table2.item2,table2.item3}

Struct 2:
    {table3.item1,table3.item2,table3.item3}

Desired result:

A    B
'a'  [{table1.item1,table1.item2,table1.item3},{table1.item1,table1.item2,table1.item3},{table2.item1,table2.item2,table2.item3},{table3.item1,table3.item2,table3.item3}]

在上面的查询中，我使用字符串连接运算符作为我的“将函数”结构追加到将从collect_list返回的结构数组的函数。