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https://issues.apache.org/jira/browse/DRILL-4868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15762525#comment-15762525
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Chunhui Shi commented on DRILL-4868:
------------------------------------
if data is null, isSet set to 0 to prevent upper layer caller(e.g. another
function) from operating on null.
> Hive functions should update writerIndex accordingly when return binary type
> ----------------------------------------------------------------------------
>
> Key: DRILL-4868
> URL: https://issues.apache.org/jira/browse/DRILL-4868
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Chunhui Shi
> Assignee: Chunhui Shi
>
> unhex is a Hive function. the returned binary buffer could not be consumed by
> convert_from as shown below.
> 0: jdbc:drill:zk=10.10.88.128:5181> select
> convert_from(unhex('0a5f710b'),'int_be') from (values(1));
> Error: SYSTEM ERROR: IndexOutOfBoundsException: readerIndex(0) + length(4)
> exceeds writerIndex(0): DrillBuf[31], udle: [25 0..1024]
> Fragment 0:0
> [Error Id: 5e72ce4a-6164-4260-8317-ca2bb6325013 on atsqa4-128.qa.lab:31010]
> (state=,code=0)
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