Dudu Markovitz created HIVE-13733:
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Summary: CTE + "IS NULL" predicate + column aliasing as existing
column leads to wrong results
Key: HIVE-13733
URL: https://issues.apache.org/jira/browse/HIVE-13733
Project: Hive
Issue Type: Bug
Affects Versions: 1.1.0
Reporter: Dudu Markovitz
hive> create table t (i int,a string,b string);
hive> insert into t values (1,'hello','world'),(2,'bye',null);
hive> select * from t where t.b is null;
2 bye NULL
This is wrong, all 3 columns should return the same value - t.a.
hive> with cte as (select t.a as a,t.a as b,t.a as c from t where t.b is null)
select * from cte;
bye NULL bye
However, this are right:
hive> select t.a as a,t.a as b,t.a as c from t where t.b is null;
bye bye bye
hive> with cte as (select t.a as a,t.a as b,t.a as c from t where t.b is not
null) select * from cte;OK
hello hello hello
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