Zoltan Haindrich created HIVE-26135:
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Summary: Invalid Anti join conversion may cause missing results
Key: HIVE-26135
URL: https://issues.apache.org/jira/browse/HIVE-26135
Project: Hive
Issue Type: Bug
Reporter: Zoltan Haindrich
Assignee: Zoltan Haindrich
right now I think the following is needed to trigger the issue:
* left outer join
* only select left hand side columns
* conditional which is using some udf
* the nullness of the udf is checked
repro sql; in case the conversion happens the row with 'a' will be missing
{code}
drop table if exists t;
drop table if exists n;
create table t(a string) stored as orc;
create table n(a string) stored as orc;
insert into t values ('a'),('1'),('2'),(null);
insert into n values ('a'),('b'),('1'),('3'),(null);
explain select n.* from n left outer join t on (n.a=t.a) where assert_true(t.a
is null) is null;
explain select n.* from n left outer join t on (n.a=t.a) where cast(t.a as
float) is null;
select n.* from n left outer join t on (n.a=t.a) where cast(t.a as float) is
null;
set hive.auto.convert.anti.join=false;
select n.* from n left outer join t on (n.a=t.a) where cast(t.a as float) is
null;
{code}
workaround could be to disable the feature:
{code}
set hive.auto.convert.anti.join=false;
{code}
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