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https://issues.apache.org/jira/browse/DRILL-4425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15160288#comment-15160288
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Saurabh Nigam commented on DRILL-4425:
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[~jaltekruse] Yes correct blank column name is not valid in SQL but in Hbase
you can provide any key value pair where your key could be blank too(By 'key' I
mean column name for easy understanding of Hbase concept).
I mistakenly create a blank column and now I cannot access it via Drill. Can't
we use a wildcard for replacing blank for Hbase queries.
Also Hbase may have blank column family name too. Check ":key" column in Hbase.
> Handle blank column names in Hbase in CONVERT_FROM
> --------------------------------------------------
>
> Key: DRILL-4425
> URL: https://issues.apache.org/jira/browse/DRILL-4425
> Project: Apache Drill
> Issue Type: New Feature
> Components: Storage - HBase
> Affects Versions: 1.3.0
> Environment: Apache Drill 1.3 on HortonWorks HDP VM 2.1
> Reporter: Saurabh Nigam
> Priority: Minor
> Labels: easyfix
>
> Hbase table may contain blank column names & blank column family names. Drill
> needs to handle such situation.
> I faced the issue when I had a column with blank column name in my Hbase
> Table. To reproduce it :
> -Create a column without any name in Hbase
> -Try to access it via Drill console
> -Try to use CONVERT_FROM function to convert that data from Base64 encoding
> to make it readable. You wont be able to convert blank column because you
> cannot use blank in your query after a dot.
> Something like this
> SELECT CONVERT_FROM(students. , 'UTF8') AS zipcode
> FROM students;
> Where column name is blank
> We need to provide a placeholder for blank column names
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