待补充# Spark2 Dataset之collect_set与collect_list
collect_set去除重复元素；collect_list不去除重复元素
select gender,
concat_ws(',', collect_set(children)),
concat_ws(',', collect_list(children))
from Affairs
group by gender
|
待补充# Spark2 Dataset之collect_set与collect_list
collect_set去除重复元素；collect_list不去除重复元素
select gender,
concat_ws(',', collect_set(children)),
concat_ws(',', collect_list(children))
from Affairs
group by gender
|
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