{"id":"https://openalex.org/W2752966494","doi":"https://doi.org/10.1145/3137586.3137588","title":"Semantic Optimization in Tractable Classes of Conjunctive Queries","display_name":"Semantic Optimization in Tractable Classes of Conjunctive Queries","publication_year":2017,"publication_date":"2017-09-01","ids":{"openalex":"https://openalex.org/W2752966494","doi":"https://doi.org/10.1145/3137586.3137588","mag":"2752966494"},"language":"en","primary_location":{"id":"doi:10.1145/3137586.3137588","is_oa":false,"landing_page_url":"https://doi.org/10.1145/3137586.3137588","pdf_url":null,"source":{"id":"https://openalex.org/S47508943","display_name":"ACM SIGMOD Record","issn_l":"0163-5808","issn":["0163-5808","1943-5835"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319798","host_organization_name":"Association for Computing Machinery","host_organization_lineage":["https://openalex.org/P4310319798"],"host_organization_lineage_names":["Association for Computing Machinery"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"ACM SIGMOD Record","raw_type":"journal-article"},"type":"article","indexed_in":["crossref"],"open_access":{"is_oa":true,"oa_status":"green","oa_url":"https://www.research.ed.ac.uk/en/publications/1dc060ed-ea97-4f2e-bbe3-0ca1d55023eb","any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5051683347","display_name":"Pablo Barcel\u00f3","orcid":"https://orcid.org/0000-0003-2293-2653"},"institutions":[{"id":"https://openalex.org/I69737025","display_name":"University of Chile","ror":"https://ror.org/047gc3g35","country_code":"CL","type":"education","lineage":["https://openalex.org/I69737025"]}],"countries":["CL"],"is_corresponding":false,"raw_author_name":"Pablo Barcel\u00f3","raw_affiliation_strings":["University of Chile"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"University of Chile","institution_ids":["https://openalex.org/I69737025"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5067962748","display_name":"Andr\u00e9as Pieris","orcid":"https://orcid.org/0000-0003-4779-3469"},"institutions":[{"id":"https://openalex.org/I98677209","display_name":"University of Edinburgh","ror":"https://ror.org/01nrxwf90","country_code":"GB","type":"education","lineage":["https://openalex.org/I98677209"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"Andreas Pieris","raw_affiliation_strings":["University of Edinburgh"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"University of Edinburgh","institution_ids":["https://openalex.org/I98677209"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5068180032","display_name":"Miguel Romero","orcid":"https://orcid.org/0000-0002-2615-6455"},"institutions":[{"id":"https://openalex.org/I69737025","display_name":"University of Chile","ror":"https://ror.org/047gc3g35","country_code":"CL","type":"education","lineage":["https://openalex.org/I69737025"]}],"countries":["CL"],"is_corresponding":false,"raw_author_name":"Miguel Romero","raw_affiliation_strings":["University of Chile"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"University of Chile","institution_ids":["https://openalex.org/I69737025"]}]}],"institutions":[],"countries_distinct_count":2,"institutions_distinct_count":2,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":0.9781,"has_fulltext":true,"cited_by_count":8,"citation_normalized_percentile":{"value":0.81444547,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":97},"biblio":{"volume":"46","issue":"2","first_page":"5","last_page":"17"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11596","display_name":"Constraint Satisfaction and Optimization","score":0.9986000061035156,"subfield":{"id":"https://openalex.org/subfields/1705","display_name":"Computer Networks and Communications"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T11596","display_name":"Constraint Satisfaction and Optimization","score":0.9986000061035156,"subfield":{"id":"https://openalex.org/subfields/1705","display_name":"Computer Networks and Communications"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11106","display_name":"Data Management and Algorithms","score":0.9984999895095825,"subfield":{"id":"https://openalex.org/subfields/1711","display_name":"Signal Processing"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10317","display_name":"Advanced Database Systems and Queries","score":0.9983999729156494,"subfield":{"id":"https://openalex.org/subfields/1705","display_name":"Computer Networks and Communications"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/tuple","display_name":"Tuple","score":0.798413097858429},{"id":"https://openalex.org/keywords/bounded-function","display_name":"Bounded function","score":0.7337291836738586},{"id":"https://openalex.org/keywords/conjunctive-query","display_name":"Conjunctive query","score":0.7271977663040161},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.7093143463134766},{"id":"https://openalex.org/keywords/focus","display_name":"Focus (optics)","score":0.5658779740333557},{"id":"https://openalex.org/keywords/constraint","display_name":"Constraint (computer-aided design)","score":0.5473371744155884},{"id":"https://openalex.org/keywords/class","display_name":"Class (philosophy)","score":0.5236361026763916},{"id":"https://openalex.org/keywords/theoretical-computer-science","display_name":"Theoretical computer science","score":0.5005340576171875},{"id":"https://openalex.org/keywords/core","display_name":"Core (optical fiber)","score":0.49165183305740356},{"id":"https://openalex.org/keywords/boolean-conjunctive-query","display_name":"Boolean conjunctive query","score":0.42246973514556885},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.2565195560455322},{"id":"https://openalex.org/keywords/discrete-mathematics","display_name":"Discrete mathematics","score":0.2260318100452423},{"id":"https://openalex.org/keywords/information-retrieval","display_name":"Information retrieval","score":0.13730749487876892},{"id":"https://openalex.org/keywords/web-search-query","display_name":"Web search query","score":0.11193743348121643},{"id":"https://openalex.org/keywords/artificial-intelligence","display_name":"Artificial intelligence","score":0.103142648935318},{"id":"https://openalex.org/keywords/relational-database","display_name":"Relational database","score":0.1026882529258728},{"id":"https://openalex.org/keywords/search-engine","display_name":"Search engine","score":0.09736281633377075},{"id":"https://openalex.org/keywords/web-query-classification","display_name":"Web query classification","score":0.09069418907165527}],"concepts":[{"id":"https://openalex.org/C118930307","wikidata":"https://www.wikidata.org/wiki/Q600590","display_name":"Tuple","level":2,"score":0.798413097858429},{"id":"https://openalex.org/C34388435","wikidata":"https://www.wikidata.org/wiki/Q2267362","display_name":"Bounded function","level":2,"score":0.7337291836738586},{"id":"https://openalex.org/C65647387","wikidata":"https://www.wikidata.org/wiki/Q1781706","display_name":"Conjunctive query","level":3,"score":0.7271977663040161},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.7093143463134766},{"id":"https://openalex.org/C192209626","wikidata":"https://www.wikidata.org/wiki/Q190909","display_name":"Focus (optics)","level":2,"score":0.5658779740333557},{"id":"https://openalex.org/C2776036281","wikidata":"https://www.wikidata.org/wiki/Q48769818","display_name":"Constraint (computer-aided design)","level":2,"score":0.5473371744155884},{"id":"https://openalex.org/C2777212361","wikidata":"https://www.wikidata.org/wiki/Q5127848","display_name":"Class (philosophy)","level":2,"score":0.5236361026763916},{"id":"https://openalex.org/C80444323","wikidata":"https://www.wikidata.org/wiki/Q2878974","display_name":"Theoretical computer science","level":1,"score":0.5005340576171875},{"id":"https://openalex.org/C2164484","wikidata":"https://www.wikidata.org/wiki/Q5170150","display_name":"Core (optical fiber)","level":2,"score":0.49165183305740356},{"id":"https://openalex.org/C24755975","wikidata":"https://www.wikidata.org/wiki/Q4943354","display_name":"Boolean conjunctive query","level":5,"score":0.42246973514556885},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.2565195560455322},{"id":"https://openalex.org/C118615104","wikidata":"https://www.wikidata.org/wiki/Q121416","display_name":"Discrete mathematics","level":1,"score":0.2260318100452423},{"id":"https://openalex.org/C23123220","wikidata":"https://www.wikidata.org/wiki/Q816826","display_name":"Information retrieval","level":1,"score":0.13730749487876892},{"id":"https://openalex.org/C164120249","wikidata":"https://www.wikidata.org/wiki/Q995982","display_name":"Web search query","level":3,"score":0.11193743348121643},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.103142648935318},{"id":"https://openalex.org/C5655090","wikidata":"https://www.wikidata.org/wiki/Q192588","display_name":"Relational database","level":2,"score":0.1026882529258728},{"id":"https://openalex.org/C97854310","wikidata":"https://www.wikidata.org/wiki/Q19541","display_name":"Search engine","level":2,"score":0.09736281633377075},{"id":"https://openalex.org/C118689300","wikidata":"https://www.wikidata.org/wiki/Q7978614","display_name":"Web query classification","level":4,"score":0.09069418907165527},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.0},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.0},{"id":"https://openalex.org/C2524010","wikidata":"https://www.wikidata.org/wiki/Q8087","display_name":"Geometry","level":1,"score":0.0},{"id":"https://openalex.org/C134306372","wikidata":"https://www.wikidata.org/wiki/Q7754","display_name":"Mathematical analysis","level":1,"score":0.0},{"id":"https://openalex.org/C120665830","wikidata":"https://www.wikidata.org/wiki/Q14620","display_name":"Optics","level":1,"score":0.0}],"mesh":[],"locations_count":4,"locations":[{"id":"doi:10.1145/3137586.3137588","is_oa":false,"landing_page_url":"https://doi.org/10.1145/3137586.3137588","pdf_url":null,"source":{"id":"https://openalex.org/S47508943","display_name":"ACM SIGMOD Record","issn_l":"0163-5808","issn":["0163-5808","1943-5835"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319798","host_organization_name":"Association for Computing Machinery","host_organization_lineage":["https://openalex.org/P4310319798"],"host_organization_lineage_names":["Association for Computing Machinery"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"ACM SIGMOD Record","raw_type":"journal-article"},{"id":"pmh:oai:pure.ed.ac.uk:publications/1dc060ed-ea97-4f2e-bbe3-0ca1d55023eb","is_oa":true,"landing_page_url":null,"pdf_url":"https://www.research.ed.ac.uk/en/publications/1dc060ed-ea97-4f2e-bbe3-0ca1d55023eb","source":{"id":"https://openalex.org/S4406922455","display_name":"Edinburgh Research Explorer","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"","raw_type":""},{"id":"pmh:oai:pure.ed.ac.uk:publications/1dc060ed-ea97-4f2e-bbe3-0ca1d55023eb","is_oa":true,"landing_page_url":"https://www.research.ed.ac.uk/en/publications/1dc060ed-ea97-4f2e-bbe3-0ca1d55023eb","pdf_url":"https://www.research.ed.ac.uk/en/publications/1dc060ed-ea97-4f2e-bbe3-0ca1d55023eb","source":{"id":"https://openalex.org/S4306400321","display_name":"Edinburgh Research Explorer (University of Edinburgh)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I98677209","host_organization_name":"University of Edinburgh","host_organization_lineage":["https://openalex.org/I98677209"],"host_organization_lineage_names":[],"type":"repository"},"license":"other-oa","license_id":"https://openalex.org/licenses/other-oa","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"Barcel\u00f3, P, Pieris, A & Romero, M 2017, 'Semantic Optimization in Tractable Classes of Conjunctive Queries', ACM SIGMOD Record, vol. 46, no. 2, pp. 5-17. https://doi.org/10.1145/3137586.3137588","raw_type":"info:eu-repo/semantics/publishedVersion"},{"id":"pmh:oai:pure.ed.ac.uk:openaire/1dc060ed-ea97-4f2e-bbe3-0ca1d55023eb","is_oa":true,"landing_page_url":"https://hdl.handle.net/20.500.11820/1dc060ed-ea97-4f2e-bbe3-0ca1d55023eb","pdf_url":null,"source":{"id":"https://openalex.org/S4306400321","display_name":"Edinburgh Research Explorer (University of Edinburgh)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I98677209","host_organization_name":"University of Edinburgh","host_organization_lineage":["https://openalex.org/I98677209"],"host_organization_lineage_names":[],"type":"repository"},"license":"other-oa","license_id":"https://openalex.org/licenses/other-oa","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"Barcel\u00f3, P, Pieris, A & Romero, M 2017, 'Semantic Optimization in Tractable Classes of Conjunctive Queries', ACM SIGMOD Record, vol. 46, no. 2, pp. 5-17. https://doi.org/10.1145/3137586.3137588","raw_type":"info:eu-repo/semantics/publishedVersion"}],"best_oa_location":{"id":"pmh:oai:pure.ed.ac.uk:publications/1dc060ed-ea97-4f2e-bbe3-0ca1d55023eb","is_oa":true,"landing_page_url":null,"pdf_url":"https://www.research.ed.ac.uk/en/publications/1dc060ed-ea97-4f2e-bbe3-0ca1d55023eb","source":{"id":"https://openalex.org/S4406922455","display_name":"Edinburgh Research Explorer","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"","raw_type":""},"sustainable_development_goals":[{"score":0.41999998688697815,"display_name":"Peace, Justice and strong institutions","id":"https://metadata.un.org/sdg/16"}],"awards":[],"funders":[],"has_content":{"grobid_xml":true,"pdf":true},"content_urls":{"pdf":"https://content.openalex.org/works/W2752966494.pdf","grobid_xml":"https://content.openalex.org/works/W2752966494.grobid-xml"},"referenced_works_count":61,"referenced_works":["https://openalex.org/W52840101","https://openalex.org/W655258421","https://openalex.org/W1479954532","https://openalex.org/W1547414429","https://openalex.org/W1558832481","https://openalex.org/W1565047086","https://openalex.org/W1569370144","https://openalex.org/W1570425181","https://openalex.org/W1585533089","https://openalex.org/W1735526352","https://openalex.org/W1787617900","https://openalex.org/W1824207140","https://openalex.org/W1885032915","https://openalex.org/W1967827263","https://openalex.org/W1969276117","https://openalex.org/W1969965298","https://openalex.org/W1970782121","https://openalex.org/W1970956440","https://openalex.org/W1977735896","https://openalex.org/W1979514837","https://openalex.org/W1985581502","https://openalex.org/W1988045490","https://openalex.org/W1991477862","https://openalex.org/W1992673035","https://openalex.org/W1999396796","https://openalex.org/W2000773957","https://openalex.org/W2001399171","https://openalex.org/W2004485491","https://openalex.org/W2005032394","https://openalex.org/W2005735417","https://openalex.org/W2006519067","https://openalex.org/W2006772093","https://openalex.org/W2008865455","https://openalex.org/W2033325972","https://openalex.org/W2046130308","https://openalex.org/W2048685245","https://openalex.org/W2073279331","https://openalex.org/W2074489032","https://openalex.org/W2102729564","https://openalex.org/W2107988095","https://openalex.org/W2111829945","https://openalex.org/W2134483537","https://openalex.org/W2169196165","https://openalex.org/W2232813226","https://openalex.org/W2270170253","https://openalex.org/W2423871547","https://openalex.org/W2480499276","https://openalex.org/W2490706771","https://openalex.org/W2531240070","https://openalex.org/W2598446717","https://openalex.org/W2624220145","https://openalex.org/W2950822337","https://openalex.org/W3023186102","https://openalex.org/W3105715528","https://openalex.org/W4206031975","https://openalex.org/W4285719527","https://openalex.org/W4300640933","https://openalex.org/W6633513001","https://openalex.org/W6633989784","https://openalex.org/W6634978497","https://openalex.org/W6639354189"],"related_works":["https://openalex.org/W1967430536","https://openalex.org/W3107700780","https://openalex.org/W3092785261","https://openalex.org/W1505212787","https://openalex.org/W2340557151","https://openalex.org/W3047081115","https://openalex.org/W3170346938","https://openalex.org/W2949144621","https://openalex.org/W4282550487","https://openalex.org/W2910962884"],"abstract_inverted_index":{"This":[0],"paper":[1],"reports":[2],"on":[3,12,32],"recent":[4],"advances":[5],"in":[6,111,131],"semantic":[7],"query":[8],"optimization.":[9],"We":[10],"focus":[11],"the":[13,44,56,63,86,116,123,127],"core":[14],"class":[15],"of":[16,28,35,43,58,65,71,88,100],"conjunctive":[17],"queries":[18],"(CQs).":[19],"Since":[20],"CQ":[21,68,89,94],"evaluation":[22],"is":[23],"NP-complete,":[24],"a":[25,67,82,93],"long":[26],"line":[27],"research":[29],"has":[30],"concentrated":[31],"identifying":[33],"fragments":[34],"CQs":[36],"that":[37,80],"can":[38,108],"be":[39,96,109],"efficiently":[40],"evaluated.":[41],"One":[42],"most":[45],"general":[46],"such":[47,81],"restrictions":[48],"corresponds":[49],"to":[50],"bounded":[51,72,101],"generalized":[52,73,102],"hypertreewidth,":[53,103],"which":[54],"extends":[55],"notion":[57],"acyclicity.":[59],"Here":[60],"we":[61,76,104],"discuss":[62,105],"problem":[64],"reformulating":[66],"into":[69],"one":[70,99],"hypertreewidth.":[74],"Furthermore,":[75],"study":[77],"whether":[78],"knowing":[79],"reformulation":[83],"exists":[84],"alleviates":[85],"cost":[87],"evaluation.":[90],"In":[91],"case":[92,128],"cannot":[95],"reformulated":[97],"as":[98],"how":[106],"it":[107],"approximated":[110],"an":[112],"optimal":[113],"way.":[114],"All":[115],"above":[117],"issues":[118],"are":[119,137],"examined":[120],"both":[121],"for":[122],"constraint-free":[124],"case,":[125],"and":[126,134],"where":[129],"constraints,":[130],"fact,":[132],"tuple-generating":[133],"equality-generating":[135],"dependencies,":[136],"present":[138]},"counts_by_year":[{"year":2023,"cited_by_count":1},{"year":2022,"cited_by_count":1},{"year":2021,"cited_by_count":1},{"year":2020,"cited_by_count":1},{"year":2019,"cited_by_count":1},{"year":2018,"cited_by_count":3}],"updated_date":"2026-08-04T08:18:43.703281","created_date":"2025-10-10T00:00:00"}