correctly handle "weird" function names with periods and quotes in HQL

hibernate-core/src/main/antlr/org/hibernate/grammars/hql/HqlParser.g4

@@ -985,7 +985,9 @@ genericFunction
 	;
 
 /**
- * The name of a generic function
+ * The name of a generic function, which may contain periods and quoted identifiers
+ *
+ * Names of generic functions are resolved against the SqmFunctionRegistry
  */
 genericFunctionName
 	: simplePath

hibernate-core/src/main/java/org/hibernate/query/hql/internal/SemanticQueryBuilder.java

@@ -3155,9 +3155,19 @@ public class SemanticQueryBuilder<R> extends HqlParserBaseVisitor<Object> implem
 		);
 	}
 
+	@Override
+	public String visitGenericFunctionName(HqlParser.GenericFunctionNameContext ctx) {
+		StringBuilder functionName = new StringBuilder( visitIdentifier( ctx.simplePath().identifier() ) );
+		for ( HqlParser.SimplePathElementContext sp: ctx.simplePath().simplePathElement() ) {
+			// allow function names of form foo.bar to be located in the registry
+			functionName.append('.').append( visitIdentifier( sp.identifier() ) );
+		}
+		return functionName.toString();
+	}
+
 	@Override
 	public Object visitGenericFunction(HqlParser.GenericFunctionContext ctx) {
-		final String originalFunctionName = ctx.getChild( 0 ).getText();
+		final String originalFunctionName = visitGenericFunctionName( ctx.genericFunctionName() );
 		final String functionName = originalFunctionName.toLowerCase();
 		if ( creationOptions.useStrictJpaCompliance() && !JPA_STANDARD_FUNCTIONS.contains( functionName ) ) {
 			throw new StrictJpaComplianceViolation(

hibernate-core/src/test/java/org/hibernate/orm/test/hql/QuotedIdentifierTest.java

@@ -9,6 +9,7 @@ package org.hibernate.orm.test.hql;
 import java.util.List;
 
 import org.hibernate.testing.junit4.BaseCoreFunctionalTestCase;
+import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 
@@ -46,6 +47,13 @@ public class QuotedIdentifierTest extends BaseCoreFunctionalTestCase {
 		} );
 	}
 
+	@After
+	public void tearDown() {
+		doInHibernate( this::sessionFactory, session -> {
+			session.createQuery("delete `The Person`").executeUpdate();
+		} );
+	}
+
 	@Test
 	public void testQuotedIdentifier() {
 		doInHibernate( this::sessionFactory, session -> {
@@ -60,6 +68,20 @@ public class QuotedIdentifierTest extends BaseCoreFunctionalTestCase {
 		} );
 	}
 
+	@Test
+	public void testQuotedFunctionName() {
+		doInHibernate( this::sessionFactory, session -> {
+			TypedQuery<Tuple> query = session.createQuery(
+					"select `upper`(`the person`.`name`) as `The person name` " +
+							"from `The Person` `the person`",
+					Tuple.class
+			);
+			List<Tuple> resultList = query.getResultList();
+			assertEquals( 1, resultList.size() );
+			assertEquals( "CHUCK", resultList.get( 0 ).get( "The person name" ) );
+		} );
+	}
+
 	@Entity(name = "The Person")
 	public static class Person {