[JENA-1856] Unexpected results with GROUP_BY and GROUP_CONCAT - ASF JIRA

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Attached is:

some example data
a query that works as I expected, without GROUP BY
the same query with GROUP BY and GROUP_CONCAT added, which doesn't work as I expected

Am I doing something wrong, or is this a bug?

Using the query without GROUP BY, I get these results as expected:

thing	decimal	boolean
<http://example.org/data/a>		<http://example.org/data/a/values/2>
<http://example.org/data/b>		<http://example.org/data/b/values/2>
<http://example.org/data/b>	<http://example.org/data/b/values/1>

Using the query with GROUP BY and GROUP_CONCAT, I expected to get:

thing	decimal__Concat	boolean__Concat
<http://example.org/data/a>		<http://example.org/data/a/values/2>
<http://example.org/data/b>	<http://example.org/data/b/values/1>	<http://example.org/data/b/values/2>

But instead I get:

thing	decimal__Concat	boolean__Concat
<http://example.org/data/a>		<http://example.org/data/a/values/2>
<http://example.org/data/b>

Should I be doing something different to get the results I expected?