fix: UNION performance

Author: tpluscode

.changeset/few-carrots-explain.md

@@ -0,0 +1,5 @@
+---
+"rdf-web-access-control": minor
+---
+
+Inline the `VALUES` clauses inside every `UNION` to improve performance when store does "bottom-up" query evaluation

packages/rdf-web-access-control/lib/instanceAuthorization.ts

@@ -14,10 +14,19 @@ export function instanceAuthorization(
   const check = { authorization, agent: variable('agent'), agentClass: variable('agentClass') }
   const term = variable('term')
 
-  const patternUnion = authorizationChecks.reduce((previous, buildPatterns) => {
+  const values = sparql`
+    VALUES ?mode { ${acl.Control} ${accessMode} }
+    VALUES ?agent { ${agentTerm || '<>'} }
+    VALUES ?agentClass { ${foaf.Agent} ${agentClasses(agent).filter(onlyNamedNodes)} }
+    VALUES ?term { ${terms} }
+  `
+
+  return ASK`${(authorizationChecks.reduce((previous, buildPatterns) => {
     return sparql`${previous}
     UNION
     {
+      ${values}
+
       ${authorization} a ${acl.Authorization} ;
                      ${acl.mode} ?mode ;
                      ${acl.accessTo} ${term} .
@@ -26,6 +35,8 @@ export function instanceAuthorization(
     }
     UNION
     {
+      ${values}
+
       ${term} a ?type .
       ${authorization} a ${acl.Authorization} ;
                      ${acl.mode} ?mode ;
@@ -34,14 +45,8 @@ export function instanceAuthorization(
       ${combinePatterns(additionalPatterns, authorization)}
     }`
   }, sparql`{
-    ${term} ${acl.owner} ?agent .
-  }`)
+    ${values}
 
-  return ASK`
-    VALUES ?mode { ${acl.Control} ${accessMode} }
-    VALUES ?agent { ${agentTerm || '<>'} }
-    VALUES ?agentClass { ${foaf.Agent} ${agentClasses(agent).filter(onlyNamedNodes)} }
-    VALUES ?term { ${terms} }
-
-    ${patternUnion}`
+    ${term} ${acl.owner} ?agent .
+  }`))}`
 }

packages/rdf-web-access-control/lib/typeAuthorization.ts

@@ -13,8 +13,17 @@ export function typeAuthorization(
   const authorization = variable('authorization')
   const check = { authorization, agent: variable('agent'), agentClass: variable('agentClass') }
 
+  const values = sparql`
+    VALUES ?mode { ${acl.Control} ${accessMode} }
+    VALUES ?type { ${rdfs.Resource} ${types.filter(onlyNamedNodes)} }
+    VALUES ?agent { ${agentTerm || '<>'} }
+    VALUES ?agentClass { ${foaf.Agent} ${agentClasses(agent).filter(onlyNamedNodes)} }
+    `
+
   const patternUnion = authorizationChecks.reduce((previous: SparqlTemplateResult | string, buildPatterns) => {
     const next = sparql`{
+      ${values}
+
       ${authorization} a ${acl.Authorization} ;
                      ${acl.mode} ?mode ;
                      ${acl.accessToClass} ?type .
@@ -29,11 +38,6 @@ export function typeAuthorization(
   }, '')
 
   return ASK`
-    VALUES ?mode { ${acl.Control} ${accessMode} }
-    VALUES ?type { ${rdfs.Resource} ${types.filter(onlyNamedNodes)} }
-    VALUES ?agent { ${agentTerm || '<>'} }
-    VALUES ?agentClass { ${foaf.Agent} ${agentClasses(agent).filter(onlyNamedNodes)} }
-
     ${combinePatterns(additionalPatterns, authorization)}
 
     ${patternUnion}`

yarn.lock

@@ -1772,7 +1772,7 @@ ansi-regex@^4.1.0:
   resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-4.1.1.tgz#164daac87ab2d6f6db3a29875e2d1766582dabed"
   integrity sha512-ILlv4k/3f6vfQ4OoP2AGvirOktlQ98ZEL1k9FaQjxa3L1abBgbuTDAdPOpvbGncC0BTVQrl+OM8xZGK6tWXt7g==
 
-ansi-regex@^5.0.0, ansi-regex@^5.0.1:
+ansi-regex@^5.0.1:
   version "5.0.1"
   resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-5.0.1.tgz#082cb2c89c9fe8659a311a53bd6a4dc5301db304"
   integrity sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==