rongyousu opened a new issue #4926:
URL: https://github.com/apache/incubator-doris/issues/4926
the detail is that:
sql:
with a as
(
select 2 as id, '1234' as user_id
union all
select 1 as id, NULL as user_id
),
b as
(
select 4 as id, '543' as user_id
union all
select 3 as id, NULL as user_id
)
select id,user_id from a
union all
select id ,user_id from b
the result is :
my value is "NULL " ,but use with lable ,the result is issue, now is ''
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