[KYLIN-4963] multiple union all query unresponsive

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: v2.6.3, v3.1.0
• Component/s: Query Engine
• Environment: Centos 7.4.1 ; hbase 1.2.4 ; hive 2.0.1 ; hadoop 2.7.2
• Assignee: Unassigned
• Reporter: GuKe
• Created: 08/Apr/21 09:57
• Updated: 09/Apr/21 01:50

Description

When i use multiple union all for different query , while the front two query result is empty ，the request of query will be unresponsive.
eg:
select 'a' as t from table1 where 1=2
union all
select 'b' as t from table1 where 1=2
union all
select 'c' as t from table1 where 1=1