🐛 Columns are not extracted from [ rr:graphMap [ rr:template ] ]

[sroze]

Hi there 👋 A found a small issue with graphMap.

Example

<#AnswersTriplesMap>
    # Note: we need to explicitly JOIN the assessments' table so that we can get `care_recipient_id` to
    #       generate the correct graph URI.
    rr:logicalTable [ rr:tableName "my_table" ];
    rr:subjectMap [
        rr:template "https://example.com/{identifier}";
        rr:graphMap [ rr:template "https://example.com/score/{customer_id}" ];
    ];

Expected result
The customer_id column is selected and the graph is set.

Actual result
The customer_id column is not selected and this leads to the following error:

[main] ERROR es.upm.fi.dia.oeg.morph.r2rml.rdb.engine.MorphRDBNodeGenerator - error occured when translating result: The column name V_71150_customer_id was not found in this ResultSet.

Workaround
There is one, yay! Using a predicateObjectMap to explicitly fetch customer_id make the graphMap work.

[dachafra]

@jatoledo could you take a look to the issue and test it with a simple example?
@sroze thanks for the feedback, I assume that would be impossible to have a piece of the data to test the system, but at least could you share with us what is the RDBMS you are using?

[sroze]

at least could you share with us what is the RDBMS you are using?

Yep, this is PostgreSQL 👍