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https://issues.apache.org/jira/browse/HIVE-27370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17921983#comment-17921983
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Ryu Kobayashi commented on HIVE-27370:
--------------------------------------
I create small fixes so I created a new PR.
https://github.com/apache/hive/pull/5624
> SUBSTR UDF return '?' against 4-bytes character
> -----------------------------------------------
>
> Key: HIVE-27370
> URL: https://issues.apache.org/jira/browse/HIVE-27370
> Project: Hive
> Issue Type: Bug
> Components: UDF
> Reporter: Ryu Kobayashi
> Assignee: Ryu Kobayashi
> Priority: Major
> Labels: pull-request-available
>
> SUBSTR doesn't seem to support 4-byte characters. This also happens in master
> branch. Also, this does not happen in vectorized mode, so it is a problem
> specific to non-vectorized mode. An example is below:
> {code:java}
> -- vectorized mode
> create temporary table foo (str string) stored as orc;
> insert into foo values('あa🤎いiうu');
> SELECT
> SUBSTR(str, 1, 3) as b1,
> SUBSTR(str, 3) as b2,
> SUBSTR(str, -5) as b3
> FROM foo
> ;
> あa🤎 🤎いiうu 🤎いiうu {code}
> {code:java}
> -- non-vectorized
> SELECT
> SUBSTR('あa🤎いiうu', 1, 3) as b1,
> SUBSTR('あa🤎いiうu', 3) as b2,
> SUBSTR('あa🤎いiうu', -5) as b3
> ;
> あa? �いiうu ?いiうu{code}
>
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