[
https://issues.apache.org/jira/browse/HIVE-26135?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Zoltan Haindrich reassigned HIVE-26135:
---------------------------------------
> 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
> Priority: Major
>
> 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}
--
This message was sent by Atlassian Jira
(v8.20.1#820001)
