HQL function names should support schema-based prefixes.

See #3099

spring-data-jpa/src/main/antlr4/org/springframework/data/jpa/repository/query/Hql.g4

@@ -686,7 +686,7 @@ character
     ;
 
 functionName
-    : reservedWord
+    : reservedWord ('.' reservedWord)*
     ;
 
 reservedWord

spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/query/HqlQueryRenderer.java

@@ -2503,7 +2503,17 @@ public List<JpaQueryParsingToken> visitCharacter(HqlParser.CharacterContext ctx)
 
 	@Override
 	public List<JpaQueryParsingToken> visitFunctionName(HqlParser.FunctionNameContext ctx) {
-		return visit(ctx.reservedWord());
+
+		List<JpaQueryParsingToken> tokens = new ArrayList<>();
+
+		ctx.reservedWord().forEach(reservedWordContext -> {
+			tokens.addAll(visit(reservedWordContext));
+			NOSPACE(tokens);
+			tokens.add(TOKEN_DOT);
+		});
+		CLIP(tokens);
+
+		return tokens;
 	}
 
 	@Override

spring-data-jpa/src/test/java/org/springframework/data/jpa/repository/query/HqlQueryRendererTests.java

@@ -1556,4 +1556,32 @@ void typeShouldBeAValidParameter() {
 		assertQuery("select e from Employee e where e.type = :_type");
 		assertQuery("select te from TestEntity te where te.type = :type");
 	}
+
+	@Test // GH-3099
+	void functionNamesShouldSupportSchemaScoping() {
+
+		assertQuery("""
+				SELECT b
+				FROM MyEntity b
+				WHERE b.status = :status
+				      AND utl_raw.cast_to_varchar2((nlssort(lower(b.name), 'nls_sort=binary_ai'))) LIKE lower(:name)
+				ORDER BY utl_raw.cast_to_varchar2((nlssort(lower(b.name), 'nls_sort=binary_ai'))) ASC
+				""");
+
+		assertQuery("""
+				select b
+				from Bairro b
+				where b.situacao = :situacao
+				and utl_raw.cast_to_varchar2((nlssort(lower(b.nome), 'nls_sort=binary_ai'))) like lower(:nome)
+				order by utl_raw.cast_to_varchar2((nlssort(lower(b.nome), 'nls_sort=binary_ai'))) ASC
+				""");
+
+		assertQuery("""
+				select b
+				from Bairro b
+				where b.situacao = :situacao
+				and CTM_UTLRAW_NLSSORT_LOWER(b.nome) like lower(:nome)
+				order by CTM_UTLRAW_NLSSORT_LOWER(b.nome) ASC
+				""");
+	}
 }