ARROW-324: Update arrow metadata diagram

Author: Julien Le Dem <julien@dremio.com> Closes #161 from julienledem/diagram and squashes the following commits: f018cf5 [Julien Le Dem] ARROW-324: Update arrow metadata diagram
apache · Oct 7, 2016 · 3f85cee · 3f85cee
1 parent f1a4bd1
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diff --git a/format/Arrow.graffle b/format/Arrow.graffle
diff --git a/format/Arrow.png b/format/Arrow.png
diff --git a/format/Metadata.md b/format/Metadata.md
@@ -46,7 +46,17 @@ table Field {
  name: string;
  nullable: bool;
  type: Type;
+ // present only if the field is dictionary encoded
+ // will point to a dictionary provided by a DictionaryBatch message
+ dictionary: long;
+ // children apply only to Nested data types like Struct, List and Union
  children: [Field];
+ /// layout of buffers produced for this type (as derived from the Type)
+ /// does not include children
+ /// each recordbatch will return instances of those Buffers.
+ layout: [ VectorLayout ];
+ // User-defined metadata
+ custom_metadata: [ KeyValue ];
 }
 ```