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https://issues.apache.org/jira/browse/HIVE-26135?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Zoltan Haindrich updated HIVE-26135:
Description:
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}
resultset with hive.auto.convert.anti.join enabled:
{code}
+--+
| n.a |
+--+
| b|
| 3|
+--+
{code}
correct resultset with hive.auto.convert.anti.join disabled:
{code}
+---+
| n.a |
+---+
| a |
| b |
| 3 |
| NULL |
+---+
{code}
workaround could be to disable the feature:
{code}
set hive.auto.convert.anti.join=false;
{code}
was:
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}
> 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
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> 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}
> resultset with hive.auto.convert.anti.join enabled:
> {code}
> +--+
> | n.a |
> +--+
> | b|
> | 3|
> +--+
> {code}
> correct resultset with hive.auto.convert.anti.join disabled:
> {code}
> +---+
> | n.a |
> +---+
> | a |
> | b |
> | 3 |
> | NULL |
> +---+
> {code}
> workaround could be to disable the feature:
> {code}
> set hive.auto.convert.anti.join=false;
> {code}
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