Fixes #2016: Add apoc.schema.relationship.indexExists function

core/src/main/java/apoc/schema/Schemas.java

@@ -71,6 +71,12 @@ public Boolean indexExistsOnNode(@Name("labelName") String labelName, @Name("pro
         return indexExists(labelName, propertyNames);
     }
 
+    @UserFunction(value = "apoc.schema.relationship.indexExists")
+    @Description("RETURN apoc.schema.relationship.indexExists(relName, propertyNames)")
+    public Boolean indexExistsOnRelationship(@Name("labelName") String relName, @Name("propertyName") List<String> propertyNames) {
+        return indexExistsForRelationship(relName, propertyNames);
+    }
+
     @UserFunction(value = "apoc.schema.node.constraintExists")
     @Description("RETURN apoc.schema.node.constraintExists(labelName, propertyNames)")
     public Boolean constraintExistsOnNode(@Name("labelName") String labelName, @Name("propertyName") List<String> propertyNames) {
@@ -224,16 +230,23 @@ private Map<String, List<Object>> copyMapOfObjects(Map<String, List<Object>> inp
      * @return true if the index exists otherwise it returns false
      */
     private Boolean indexExists(String labelName, List<String> propertyNames) {
-        Schema schema = tx.schema();
+        Iterable<IndexDefinition> nodeIndexes = tx.schema().getIndexes(label(labelName));
+        return isIndexExistent(propertyNames, nodeIndexes);
+    }
+
+    private Boolean indexExistsForRelationship(String relName, List<String> propertyNames) {
+        Iterable<IndexDefinition> relIndexes = tx.schema().getIndexes(RelationshipType.withName(relName));
+        return isIndexExistent(propertyNames, relIndexes);
+    }
 
-        for (IndexDefinition indexDefinition : Iterables.asList(schema.getIndexes(Label.label(labelName)))) {
+    private Boolean isIndexExistent(List<String> propertyNames, Iterable<IndexDefinition> indexes) {
+        for (IndexDefinition indexDefinition : indexes) {
             List<String> properties = Iterables.asList(indexDefinition.getPropertyKeys());
 
             if (properties.equals(propertyNames)) {
                 return true;
             }
         }
-
         return false;
     }
 

core/src/test/java/apoc/schema/SchemasTest.java

@@ -342,8 +342,19 @@ public void testIndexNotExists() {
             assertEquals(false, r.entrySet().iterator().next().getValue());
         });
     }
-
-
+
+    @Test
+    public void testRelationshipExists() {
+        db.executeTransactionally("CREATE INDEX rel_index_simple FOR ()-[r:KNOWS]-() ON (r.since)");
+        db.executeTransactionally("CREATE INDEX rel_index_composite FOR ()-[r:PURCHASED]-() ON (r.date, r.amount)");
+        awaitIndexesOnline();
+
+        assertTrue(singleResultFirstColumn(db, "RETURN apoc.schema.relationship.indexExists('KNOWS', ['since'])"));
+        assertFalse(singleResultFirstColumn(db, "RETURN apoc.schema.relationship.indexExists('KNOWS', ['dunno'])"));
+        // - composite index
+        assertTrue(singleResultFirstColumn(db, "RETURN apoc.schema.relationship.indexExists('PURCHASED', ['date', 'amount'])"));
+        assertFalse(singleResultFirstColumn(db, "RETURN apoc.schema.relationship.indexExists('PURCHASED', ['date', 'another'])"));
+    }
 
     @Test
     public void testUniquenessConstraintOnNode() {

docs/asciidoc/modules/ROOT/examples/generated-documentation/apoc.schema.relationship-lite.csv

@@ -1,2 +1,3 @@
 ¦signature
 ¦apoc.schema.relationship.constraintExists(type :: STRING?, propertyName :: LIST? OF STRING?) :: (BOOLEAN?)
+¦apoc.schema.relationship.indexExists(labelName :: STRING?, propertyName :: LIST? OF STRING?) :: (BOOLEAN?)

docs/asciidoc/modules/ROOT/examples/generated-documentation/apoc.schema.relationship.csv

@@ -4,3 +4,8 @@
 RETURN apoc.schema.relationship.constraintExists(type, propertyNames)
 |label:function[]
 |label:apoc-core[]
+|xref::overview/apoc.schema.relationship/apoc.schema.adoc[apoc.schema.relationship.indexExists icon:book[]]
+
+RETURN apoc.schema.relationship.indexExists(relName, propertyNames)
+|label:function[]
+|label:apoc-core[]

docs/asciidoc/modules/ROOT/examples/generated-documentation/apoc.schema.relationship.indexExists-lite.csv

@@ -0,0 +1,2 @@
+¦signature
+¦apoc.schema.relationship.indexExists(labelName :: STRING?, propertyName :: LIST? OF STRING?) :: (BOOLEAN?)

docs/asciidoc/modules/ROOT/examples/generated-documentation/apoc.schema.relationship.indexExists.adoc

@@ -0,0 +1,5 @@
+¦xref::overview/apoc.schema/apoc.schema.relationship.indexExists.adoc[apoc.schema.relationship.indexExists icon:book[]] +
+
+
+¦label:function[]
+¦label:apoc-core[]

docs/asciidoc/modules/ROOT/examples/generated-documentation/documentation.csv

@@ -480,6 +480,7 @@ for the provided `label` and `uuidProperty`, in case the UUID handler is already
 ¦function¦apoc.schema.node.constraintExists¦apoc.schema.node.constraintExists(labelName :: STRING?, propertyName :: LIST? OF STRING?) :: (BOOLEAN?)¦RETURN apoc.schema.node.constraintExists(labelName, propertyNames)¦true¦xref::indexes/schema-index-operations.adoc
 ¦function¦apoc.schema.node.indexExists¦apoc.schema.node.indexExists(labelName :: STRING?, propertyName :: LIST? OF STRING?) :: (BOOLEAN?)¦RETURN apoc.schema.node.indexExists(labelName, propertyNames)¦true¦xref::indexes/schema-index-operations.adoc
 ¦function¦apoc.schema.relationship.constraintExists¦apoc.schema.relationship.constraintExists(type :: STRING?, propertyName :: LIST? OF STRING?) :: (BOOLEAN?)¦RETURN apoc.schema.relationship.constraintExists(type, propertyNames)¦true¦xref::indexes/schema-index-operations.adoc
+¦function¦apoc.schema.relationship.indexExists¦apoc.schema.relationship.indexExists(labelName :: STRING?, propertyName :: LIST? OF STRING?) :: (BOOLEAN?)¦RETURN apoc.schema.relationship.indexExists(relName, propertyNames)¦true¦xref::indexes/schema-index-operations.adoc
 ¦function¦apoc.scoring.existence¦apoc.scoring.existence(score :: INTEGER?, exists :: BOOLEAN?) :: (FLOAT?)¦apoc.scoring.existence(5, true) returns the provided score if true, 0 if false¦true¦
 ¦function¦apoc.scoring.pareto¦apoc.scoring.pareto(minimumThreshold :: INTEGER?, eightyPercentValue :: INTEGER?, maximumValue :: INTEGER?, score :: INTEGER?) :: (FLOAT?)¦apoc.scoring.pareto(10, 20, 100, 11) applies a Pareto scoring function over the inputs¦true¦
 ¦function¦apoc.static.get¦apoc.static.get(key :: STRING?) :: (ANY?)¦apoc.static.get(name) - returns statically stored value from config (apoc.static.<key>) or server lifetime storage¦false¦xref::misc/static-values.adoc

docs/asciidoc/modules/ROOT/pages/overview/apoc.schema/apoc.schema.relationship.indexExists.adoc

@@ -0,0 +1,29 @@
+////
+This file is generated by DocsTest, so don't change it!
+////
+
+= apoc.schema.relationship.indexExists
+:description: This section contains reference documentation for the apoc.schema.relationship.indexExists function.
+
+label:function[] label:apoc-core[]
+
+[.emphasis]
+RETURN apoc.schema.relationship.indexExists(relName, propertyNames)
+
+== Signature
+
+[source]
+----
+apoc.schema.relationship.indexExists(labelName :: STRING?, propertyName :: LIST? OF STRING?) :: (BOOLEAN?)
+----
+
+== Input parameters
+[.procedures, opts=header]
+|===
+| Name | Type | Default 
+|labelName|STRING?|null
+|propertyName|LIST? OF STRING?|null
+|===
+
+xref::indexes/schema-index-operations.adoc[More documentation of apoc.schema.relationship.indexExists,role=more information]
+

docs/asciidoc/modules/ROOT/pages/overview/apoc.schema/index.adoc

@@ -48,5 +48,10 @@ RETURN apoc.schema.node.indexExists(labelName, propertyNames)
 RETURN apoc.schema.relationship.constraintExists(type, propertyNames)
 |label:function[]
 |label:apoc-core[]
+|xref::overview/apoc.schema/apoc.schema.relationship.indexExists.adoc[apoc.schema.relationship.indexExists icon:book[]]
+
+RETURN apoc.schema.relationship.indexExists(relName, propertyNames)
+|label:function[]
+|label:apoc-core[]
 |===
 

docs/asciidoc/modules/ROOT/partials/generated-documentation/documentation.adoc

@@ -2592,6 +2592,11 @@ RETURN apoc.schema.node.indexExists(labelName, propertyNames)
 RETURN apoc.schema.relationship.constraintExists(type, propertyNames)
 |label:function[]
 |label:apoc-core[]
+|xref::overview/apoc.schema/apoc.schema.relationship.indexExists.adoc[apoc.schema.relationship.indexExists icon:book[]]
+
+RETURN apoc.schema.relationship.indexExists(relName, propertyNames)
+|label:function[]
+|label:apoc-core[]
 |===
 
 [discrete]

docs/asciidoc/modules/ROOT/partials/generated-documentation/nav.adoc

@@ -497,6 +497,7 @@ This file is generated by DocsTest, so don't change it!
 *** xref::overview/apoc.schema/apoc.schema.node.constraintExists.adoc[]
 *** xref::overview/apoc.schema/apoc.schema.node.indexExists.adoc[]
 *** xref::overview/apoc.schema/apoc.schema.relationship.constraintExists.adoc[]
+*** xref::overview/apoc.schema/apoc.schema.relationship.indexExists.adoc[]
 ** xref::overview/apoc.scoring/index.adoc[]
 *** xref::overview/apoc.scoring/apoc.scoring.existence.adoc[]
 *** xref::overview/apoc.scoring/apoc.scoring.pareto.adoc[]