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https://issues.apache.org/jira/browse/HIVE-18725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16373231#comment-16373231
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Vineet Garg commented on HIVE-18725:
------------------------------------

[~vbeshka] This exception is misleading because Hive supports more than one 
subquery expression. First query should also show the same exception/error as 
second one.

> Improve error handling for subqueries if there is wrong column reference
> ------------------------------------------------------------------------
>
>                 Key: HIVE-18725
>                 URL: https://issues.apache.org/jira/browse/HIVE-18725
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Planning
>            Reporter: Vineet Garg
>            Assignee: Kryvenko Igor
>            Priority: Major
>
> If there is a column reference within subquery which doesn't exist Hive 
> throws misleading error message.
> e.g. 
> {code:sql}
> select * from table1 where table1.col1 IN (select col2 from table2 where 
> table2.col1=table1.non_existing_column) and table1.col1 IN (select 4);
> {code}
> The above query, assuming table1 doesn't have non_existing_column, will throw 
> following misleading error:
> {noformat}
> FAILED: SemanticException Line 0:-1 Unsupported SubQuery Expression 'col1': 
> Only 1 SubQuery expression is supported.
> {noformat}



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