ensureFieldTable example

          // $node->field_image->fid->entity. In both cases, prepare the           // property definitions for the relationship. In the first case,           // also use the property definitions for column.           if ($key < $count) {
            $relationship_specifier = $specifiers[$key + 1];
            $propertyDefinitions = $field_storage->getPropertyDefinitions();

            // Prepare the next index prefix.             $next_index_prefix = "$relationship_specifier.$column";
          }
        }
        $table = $this->ensureFieldTable($index_prefix, $field_storage, $type, $langcode, $base_table, $entity_id_field, $field_id_field, $delta);
        $sql_column = $table_mapping->getFieldColumnName($field_storage, $column);
      }
      // The field is stored in a shared table.       else {
        // ensureEntityTable() decides whether an entity property will be         // queried from the data table or the base table based on where it         // finds the property first. The data table is preferred, which is why         // it gets added before the base table.         $entity_tables = [];
        $revision_table = NULL;
        if ($query_revisions) {