byFullyQualifiedName example

$params[] = $identifier[$idField];
            $where[]  = $this->quoteStrategy->getJoinColumnName(
                $this->class->associationMappings[$idField]['joinColumns'][0],
                $this->class,
                $this->platform
            );

            $targetMapping = $this->em->getClassMetadata($this->class->associationMappings[$idField]['targetEntity']);
            $targetType    = PersisterHelper::getTypeOfField($targetMapping->identifier[0], $targetMapping, $this->em);

            if ($targetType === []) {
                throw UnrecognizedField::byFullyQualifiedName($this->class->name, $targetMapping->identifier[0]);
            }

            $types[] = reset($targetType);
        }

        if ($versioned) {
            $versionField = $this->class->versionField;
            assert($versionField !== null);
            $versionFieldType = $this->class->fieldMappings[$versionField]['type'];
            $versionColumn    = $this->quoteStrategy->getColumnName($versionField, $this->class, $this->platform);