Add support for reconstructing full BLOB content

jeremycole · jeremycole · commit 5e726c2cd1f3 · 2023-05-24T10:32:19.000-07:00
diff --git a/lib/innodb/page/blob.rb b/lib/innodb/page/blob.rb
@@ -32,6 +32,12 @@ def blob_data
         end
       end
 
+      def next_blob_page
+        return unless blob_header[:next]
+
+        space.page(blob_header[:next])
+      end
+
       def each_region(&block)
         return enum_for(:each_region) unless block_given?
 
diff --git a/lib/innodb/record.rb b/lib/innodb/record.rb
@@ -39,6 +39,16 @@ def row_string
       row&.map { |r| "%s=%s" % [r.name, r.value.inspect] }&.join(", ")
     end
 
+    def full_value_with_externs_for_field(field)
+      blob_value = field.value
+      extern_page = field.extern && page.space.page(field.extern.page_number)
+      while extern_page
+        blob_value += extern_page.blob_data
+        extern_page = extern_page.next_blob_page
+      end
+      blob_value
+    end
+
     def undo
       return nil unless roll_pointer
       return unless (innodb_system = @page.space.innodb_system)
