I used comunica-query-sparql for SPARQL federated queries through docker, but did not get the expected results

[chenkuncloud]

Hi, I used comunica-query-sparql for SPARQL federated queries through docker, but did not get the expected results.

Could you help me see if this is a problem with my usage or a BUG with comunica-query-sparql?

Version:

comunica/query-sparql                                  latest    2557b056f44d   11 days ago     1.08GB

My sparql and command:

docker run --name comunica -it --rm comunica/query-sparql \
    http://linkedgeodata.org/sparql \
    https://dbpedia.org/sparql \
    " \
        PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> \
        SELECT ?s \
        WHERE { \
          ?s rdfs:label ?label . \
		  FILTER ( ?label IN ( 'Washington', 'Washington'@en ) )
        } \
        LIMIT 10 \
    "

Shell result:

......
[2023-03-22T02:45:13.468Z]  WARN: Error occurred while filtering. { error: { [Error: Some argument to IN errorred and none where equal. (false) and (Error: Equality test for literals with unsupported datatypes) ] errors: [ false, { [Error: Equality test for literals with unsupported datatypes] args: [ [Object], [Object] ] } ] }, bindings: '{\n  "s": "http://linkedgeodata.org/triplify/node1311506161",\n  "label": "\\"fixet dinteloord\\""\n}', actor: 'urn:comunica:default:query-operation/actors#filter' }
[2023-03-22T02:45:13.469Z]  WARN: Error occurred while filtering. { error: { [Error: Some argument to IN errorred and none where equal. (false) and (Error: Equality test for literals with unsupported datatypes) ] errors: [ false, { [Error: Equality test for literals with unsupported datatypes] args: [ [Object], [Object] ] } ] }, bindings: '{\n  "s": "http://linkedgeodata.org/triplify/node1311509012",\n  "label": "\\"Phillips 66\\""\n}', actor: 'urn:comunica:default:query-operation/actors#filter' }
[2023-03-22T02:45:13.469Z]  WARN: Error occurred while filtering. { error: { [Error: Some argument to IN errorred and none where equal. (false) and (Error: Equality test for literals with unsupported datatypes) ] errors: [ false, { [Error: Equality test for literals with unsupported datatypes] args: [ [Object], [Object] ] } ] }, bindings: '{\n  "s": "http://linkedgeodata.org/triplify/node1311509033",\n  "label": "\\"和平医院\\""\n}', actor: 'urn:comunica:default:query-operation/actors#filter' }
[2023-03-22T02:45:13.470Z]  WARN: Error occurred while filtering. { error: { [Error: Some argument to IN errorred and none where equal. (false) and (Error: Equality test for literals with unsupported datatypes) ] errors: [ false, { [Error: Equality test for literals with unsupported datatypes] args: [ [Object], [Object] ] } ] }, bindings: '{\n  "s": "http://linkedgeodata.org/triplify/node1311509607",\n  "label": "\\"McDonald\'s\\""\n}', actor: 'urn:comunica:default:query-operation/actors#filter' }
[2023-03-22T02:45:13.470Z]  WARN: Error occurred while filtering. { error: { [Error: Some argument to IN errorred and none where equal. (false) and (Error: Equality test for literals with unsupported datatypes) ] errors: [ false, { [Error: Equality test for literals with unsupported datatypes] args: [ [Object], [Object] ] } ] }, bindings: '{\n  "s": "http://linkedgeodata.org/triplify/node1311510016",\n  "label": "\\"Drums\\""\n}', actor: 'urn:comunica:default:query-operation/actors#filter' }
[2023-03-22T02:45:13.471Z]  WARN: Error occurred while filtering. { error: { [Error: Some argument to IN errorred and none where equal. (false) and (Error: Equality test for literals with unsupported datatypes) ] errors: [ false, { [Error: Equality test for literals with unsupported datatypes] args: [ [Object], [Object] ] } ] }, bindings: '{\n  "s": "http://linkedgeodata.org/triplify/node1311510029",\n  "label": "\\"Венеция\\""\n}', actor: 'urn:comunica:default:query-operation/actors#filter' }
[2023-03-22T02:45:13.472Z]  WARN: Error occurred while filtering. { error: { [Error: Some argument to IN errorred and none where equal. (false) and (Error: Equality test for literals with unsupported datatypes) ] errors: [ false, { [Error: Equality test for literals with unsupported datatypes] args: [ [Object], [Object] ] } ] }, bindings: '{\n  "s": "http://linkedgeodata.org/triplify/node1311510047",\n  "label": "\\"Виенски салон\\""\n}', actor: 'urn:comunica:default:query-operation/actors#filter' }
[2023-03-22T02:45:13.473Z]  WARN: Error occurred while filtering. { error: { [Error: Some argument to IN errorred and none where equal. (false) and (Error: Equality test for literals with unsupported datatypes) ] errors: [ false, { [Error: Equality test for literals with unsupported datatypes] args: [ [Object], [Object] ] } ] }, bindings: '{\n  "s": "http://linkedgeodata.org/triplify/node1311510178",\n  "label": "\\"The Gate\\""\n}', actor: 'urn:comunica:default:query-operation/actors#filter' }
[2023-03-22T02:45:13.473Z]  WARN: Error occurred while filtering. { error: { [Error: Some argument to IN errorred and none where equal. (false) and (Error: Equality test for literals with unsupported datatypes) ] errors: [ false, { [Error: Equality test for literals with unsupported datatypes] args: [ [Object], [Object] ] } ] }, bindings: '{\n  "s": "http://linkedgeodata.org/triplify/node1311511214",\n  "label": "\\"Central State Bank\\""\n}', actor: 'urn:comunica:default:query-operation/actors#filter' }
[2023-03-22T02:45:13.475Z]  WARN: Error occurred while filtering. { error: { [Error: Some argument to IN errorred and none where equal. (false) and (Error: Equality test for literals with unsupported datatypes) ] errors: [ false, { [Error: Equality test for literals with unsupported datatypes] args: [ [Object], [Object] ] } ] }, bindings: '{\n  "s": "http://linkedgeodata.org/triplify/node1311514280",\n  "label": "\\"Oporto\\""\n}', actor: 'urn:comunica:default:query-operation/actors#filter' }
[2023-03-22T02:45:13.475Z]  WARN: Error occurred while filtering. { error: { [Error: Some argument to IN errorred and none where equal. (false) and (Error: Equality test for literals with unsupported datatypes) ] errors: [ false, { [Error: Equality test for literals with unsupported datatypes] args: [ [Object], [Object] ] } ] }, bindings: '{\n  "s": "http://linkedgeodata.org/triplify/node1311514800",\n  "label": "\\"Reddish Baths (Closed)\\""\n}', actor: 'urn:comunica:default:query-operation/actors#filter' }
[2023-03-22T02:45:13.476Z]  WARN: Error occurred while filtering. { error: { [Error: Some argument to IN errorred and none where equal. (false) and (Error: Equality test for literals with unsupported datatypes) ] errors: [ false, { [Error: Equality test for literals with unsupported datatypes] args: [ [Object], [Object] ] } ] }, bindings: '{\n  "s": "http://linkedgeodata.org/triplify/node1311514801",\n  "label": "\\"Reddish Library\\""\n}', actor: 'urn:comunica:default:query-operation/actors#filter' }
[2023-03-22T02:45:13.476Z]  WARN: Error occurred while filtering. { error: { [Error: Some argument to IN errorred and none where equal. (false) and (Error: Equality test for literals with unsupported datatypes) ] errors: [ false, { [Error: Equality test for literals with unsupported datatypes] args: [ [Object], [Object] ] } ] }, bindings: '{\n  "s": "http://linkedgeodata.org/triplify/node1311514805",\n  "label": "\\"Subway\\""\n}', actor: 'urn:comunica:default:query-operation/actors#filter' }
[2023-03-22T02:45:13.477Z]  WARN: Error occurred while filtering. { error: { [Error: Some argument to IN errorred and none where equal. (false) and (Error: Equality test for literals with unsupported datatypes) ] errors: [ false, { [Error: Equality test for literals with unsupported datatypes] args: [ [Object], [Object] ] } ] }, bindings: '{\n  "s": "http://linkedgeodata.org/triplify/node1311514814",\n  "label": "\\"Marquette Cafe & Bar\\""\n}', actor: 'urn:comunica:default:query-operation/actors#filter' }
......

By the way, My understanding of comunica-query-sparql is that if I want to do a SPARQL federated query (the triples between different SPARQL endpoints are related to each other),

I can specify several SPARQL endpoints and no longer need to specify endpoints with SERVICE, right?

Such as:

Original SPARQL statement:

CONSTRUCT { ... }
WHERE {
    SERVICE <endpoint1> {
        ?s1 ?p1 ?s2 .
    }
    SERVICE <endpoint2> {
        ?s2 ?p2 ?s3 .
    }
    ...
}

If comunica-query-sparql is used, it can be changed to:

docker run --name comunica -it --rm comunica/query-sparql \
    endpoint1 \
    endpoint2 \
    " \
        CONSTRUCT { ... } \
        WHERE { \
            ?s1 ?p1 ?s2 . \
            ?s2 ?p2 ?s3 . \
            ... \
        } \
    "

[jeswr]

Your usage looks fine (unless your SPARQL query is malformed which I don't think it is). I suspect this is a dupe of #1146.

[chenkuncloud]

Thanks, @jeswr it's really a literal issue.

I see that Issue 1146 has been solved, has it not been released to docker?

[jeswr]

Looks like its been released - I just tried running your query on Comunica v2.6.9 as follows

$ npx -p @comunica/query-sparql@v2.6.9 comunica-sparql     http://linkedgeodata.org/sparql     https://dbpedia.org/sparql     " \
        PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> \
        SELECT ?s \
        WHERE { \
          ?s rdfs:label ?label . \
                  FILTER ( ?label IN ( 'Washington', 'Washington'@en ) )
        } \
        LIMIT 10 \
    "

and get the same errors you have above so there appears to still be a bug