[
https://issues.apache.org/jira/browse/HIVE-16050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15886411#comment-15886411
]
Gopal V commented on HIVE-16050:
--------------------------------
{code}
case NUMERIC_GROUP:
return TypeInfoUtils.implicitConvertible(a, b) ? b : a;
{code}
This is the most worrying part of HIVE-14251, which is not being addressed by
this JIRA.
That implies that all Numeric Groups have a valid conversion and cannot return
a NULL as a failure of coercion.
> Regression: Union of null with non-null
> ----------------------------------------
>
> Key: HIVE-16050
> URL: https://issues.apache.org/jira/browse/HIVE-16050
> Project: Hive
> Issue Type: Bug
> Components: Query Planning
> Affects Versions: 2.2.0
> Reporter: Gopal V
> Assignee: Gopal V
> Fix For: 2.2.0
>
>
> {code}
> hive> select null as c1 union select 1 as c2;
> FAILED: SemanticException Schema of both sides of union should match:
> Column c1 is of type void on first table and type int on second table. Cannot
> tell the position of null AST.
> {code}
> This looks related to HIVE-14251 which removed certain cases from the UNION
> type coercion operations.
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
