[teiid-issues] [JBoss JIRA] (TEIID-3929) Accumulo does not return null values

[Jan Stastny (JIRA)]

     [ https://issues.jboss.org/browse/TEIID-3929?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jan Stastny reopened TEIID-3929:
--------------------------------


The problem is still there.
If I select only nullable column, there are no NULL values returned, even though they should. Such query:
{code:sql}
SELECT bytenum FROM bqt1.smalla;
{code} returns 47 rows.
When I add a column, which in fact is a mapped rowid from accumulo table, I get same number of results - no NULLs returned:
{code:sql}
SELECT intkey,bytenum FROM bqt1.smalla;
{code} returns 47 rows.
Even though the query on the 'rowid' column:
{code:sql}
SELECT intkey FROM bqt1.smallA;
{code} returns 50 rows.
But when I select with not nullable column (stringkey), which is not the rowid in accumulo, I get correct results.
{code:sql}
SELECT stringkey,bytenum FROM bqt1.smalla;
{code} returns 50 rows with null values.


> Accumulo does not return null values
> ------------------------------------
>
>                 Key: TEIID-3929
>                 URL: https://issues.jboss.org/browse/TEIID-3929
>             Project: Teiid
>          Issue Type: Bug
>          Components: Misc. Connectors
>    Affects Versions: 8.12.3
>            Reporter: Jan Stastny
>            Assignee: Ramesh Reddy
>             Fix For: 9.0, 8.12.5
>
>
> Accumulo doesn't return null values when a whole 'column' is being selected.
> For a command in accumulo shell like:
> {code:plain}
> scan -c name:BYTENUM
> {code}
> Accumulo returns only non-empty values, this is expected behaviour.
> Equivalent query in Teiid would be:
> {code:sql}
> SELECT ByteNum FROM SmallA
> {code}
> Which returns the same results as Accumulo does. That means, no NULL values, if there are rowids without specified column families/qualifiers missing. But when a user has his schema defined in a vdb, he probably expects, that he will get as many rows as there are in the table.



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