I tried to get only the max of test result end time, but I failed to understand how can I filter the results such I get only tthe records where the max(end time) = end time

The results I get are:

Manage Faults
2058
Aviary Connection Test
153573
The Aviary SoS consists of the UAV aircraft (Hummingbird), Pilot Controller (Bird Cage) and up to four separate Viewers (Bird Watcher).
Aviary Connection Test
Failed
Aviary Connection Test
Inconclusive
Aviary Connection Test
Passed
Manually Directed Flight
2058
Aviary Connection Test
153573
The Aviary SoS consists of the UAV aircraft (Hummingbird), Pilot Controller (Bird Cage) and up to four separate Viewers (Bird Watcher).
Aviary Connection Test
Failed
Aviary Connection Test
Inconclusive
Aviary Connection Test
Passed

But there should be only one result for Test Result (and not 3)

Following is the used query

SELECT DISTINCT
  ?rqm_merged_QMTestPlan1_title
  ?rqm_merged_QMTestCase1_shortId
  ?rqm_merged_QMTestCase1_title
  ?dng_merged_SystemRequirement1_identifier
  ?dng_merged_SystemRequirement1_title
  ?rqm_merged_QMTestResult1_title
  ?rqm_merged_QMTestResult1_verdict
WHERE{
  ?rqm_merged_QMTestPlan1_uri process:projectArea ?rqm_merged_QMTestPlan1_paUri.
  FILTER(?rqm_merged_QMTestPlan1_paUri IN (<https://demmy.com/gc/process/project-areas/_1FLV0DbAEemg-MTlSloFXg>,
            <https://demmy.com/rm/process/project-areas/_QhSGcCMJEem4vZIQTRKFzA>,
            <https://demmy.com/qm/process/project-areas/_zVcYACMAEemxqL7t80wk5Q>))
  ?rqm_merged_QMTestPlan1_uri oslc_qm:usesTestCase ?rqm_merged_QMTestCase1_uri.
  ?rqm_merged_QMTestPlan1_uri oslc:instanceShape ?rqm_merged_QMTestPlan1_uri_instanceShape.
  ?rqm_merged_QMTestPlan1_uri_instanceShape merge:mergeShape rqm_merged:QM%20Test%20Plan.
  ?rqm_merged_QMTestPlan1_uri dcterms:title ?rqm_merged_QMTestPlan1_title.
  OPTIONAL {?rqm_merged_QMTestPlan1_ver dcterms:isVersionOf ?rqm_merged_QMTestPlan1_uri; rdf:type oslc_config:VersionResource.}
  ?rqm_merged_QMTestCase1_uri process:projectArea ?rqm_merged_QMTestCase1_paUri.
  FILTER(?rqm_merged_QMTestCase1_paUri IN (<https://demmy.com/gc/process/project-areas/_1FLV0DbAEemg-MTlSloFXg>,
            <https://demmy.com/rm/process/project-areas/_QhSGcCMJEem4vZIQTRKFzA>,
            <https://demmy.com/qm/process/project-areas/_zVcYACMAEemxqL7t80wk5Q>))
  {
    ?rqm_merged_QMTestCase1_uri oslc_qm:validatesRequirement ?dng_merged_SystemRequirement1_uri.
  } UNION {
    ?dng_merged_SystemRequirement1_uri oslc_rm:validatedBy ?rqm_merged_QMTestCase1_uri.
  }
  ?rqm_merged_QMTestResult1_uri oslc_qm:reportsOnTestCase ?rqm_merged_QMTestCase1_uri.
  ?rqm_merged_QMTestCase1_uri oslc:instanceShape ?rqm_merged_QMTestCase1_uri_instanceShape.
  ?rqm_merged_QMTestCase1_uri_instanceShape merge:mergeShape rqm_merged:QM%20Test%20Case.
  ?rqm_merged_QMTestCase1_uri dcterms:title ?rqm_merged_QMTestCase1_title.
  OPTIONAL {
    ?rqm_merged_QMTestCase1_uri oslc:shortId ?rqm_merged_QMTestCase1_shortId.
  }
  OPTIONAL {?rqm_merged_QMTestCase1_ver dcterms:isVersionOf ?rqm_merged_QMTestCase1_uri; rdf:type oslc_config:VersionResource.}
  ?rqm_merged_QMTestResult1_uri process:projectArea ?rqm_merged_QMTestResult1_paUri.
  FILTER(?rqm_merged_QMTestResult1_paUri IN (<https://demmy.com/gc/process/project-areas/_1FLV0DbAEemg-MTlSloFXg>,
            <https://demmy.com/rm/process/project-areas/_QhSGcCMJEem4vZIQTRKFzA>,
            <https://demmy.com/qm/process/project-areas/_zVcYACMAEemxqL7t80wk5Q>))
  ?rqm_merged_QMTestResult1_uri oslc:instanceShape ?rqm_merged_QMTestResult1_uri_instanceShape.
  ?rqm_merged_QMTestResult1_uri_instanceShape merge:mergeShape rqm_merged:QM%20Test%20Result.
  ?rqm_merged_QMTestResult1_uri dcterms:title ?rqm_merged_QMTestResult1_title.
  OPTIONAL {
    ?rqm_merged_QMTestResult1_uri rqm:verdict ?rqm_merged_QMTestResult1_verdict_enumValue.
    OPTIONAL {{?rqm_merged_QMTestResult1_verdict_enumValue rdfs:label ?rqm_merged_QMTestResult1_verdict_enumName} UNION {?rqm_merged_QMTestResult1_verdict_enumValue dcterms:title ?rqm_merged_QMTestResult1_verdict_enumName}}
  }
  OPTIONAL {?rqm_merged_QMTestResult1_ver dcterms:isVersionOf ?rqm_merged_QMTestResult1_uri; rdf:type oslc_config:VersionResource.}
  BIND( IF (bound(?rqm_merged_QMTestPlan1_ver), concat(str(?rqm_merged_QMTestPlan1_uri), "?oslc_config.context="), ?rqm_merged_QMTestPlan1_uri) as ?rqm_merged_QMTestPlan1)
  BIND( IF (bound(?rqm_merged_QMTestCase1_ver), concat(str(?rqm_merged_QMTestCase1_uri), "?oslc_config.context="), ?rqm_merged_QMTestCase1_uri) as ?rqm_merged_QMTestCase1)
  BIND( IF (bound(?rqm_merged_QMTestResult1_ver), concat(str(?rqm_merged_QMTestResult1_uri), "?oslc_config.context="), ?rqm_merged_QMTestResult1_uri) as ?rqm_merged_QMTestResult1)
  BIND( IF(bound(?rqm_merged_QMTestResult1_verdict_enumName), ?rqm_merged_QMTestResult1_verdict_enumName, IF(bound(?rqm_merged_QMTestResult1_verdict_enumValue), ?rqm_merged_QMTestResult1_verdict_enumValue, "")) as ?rqm_merged_QMTestResult1_verdict)
  ?dng_merged_SystemRequirement1_uri process:projectArea ?dng_merged_SystemRequirement1_paUri.
  FILTER(?dng_merged_SystemRequirement1_paUri=<https://demmy.com/rm/process/project-areas/_QhSGcCMJEem4vZIQTRKFzA>)
  ?dng_merged_SystemRequirement1_uri oslc:instanceShape ?dng_merged_SystemRequirement1_uri_instanceShape.
  ?dng_merged_SystemRequirement1_uri_instanceShape merge:mergeShape dng_merged:System%20Requirement.
  ?dng_merged_SystemRequirement1_uri dcterms:title ?dng_merged_SystemRequirement1_title.
  OPTIONAL {
    ?dng_merged_SystemRequirement1_uri dcterms:identifier ?dng_merged_SystemRequirement1_identifier.
  }
  OPTIONAL {?dng_merged_SystemRequirement1_ver dcterms:isVersionOf ?dng_merged_SystemRequirement1_uri; rdf:type oslc_config:VersionResource.}
  BIND( IF (bound(?dng_merged_SystemRequirement1_ver), concat(str(?dng_merged_SystemRequirement1_uri), "?oslc_config.context="), ?dng_merged_SystemRequirement1_uri) as ?dng_merged_SystemRequirement1)
}
ORDER BY asc(?rqm_merged_QMTestPlan1_title) asc(?rqm_merged_QMTestCase1_shortId) asc(?rqm_merged_QMTestCase1_title) asc(?dng_merged_SystemRequirement1_identifier) asc(?dng_merged_SystemRequirement1_title)