Finish 0.6.0 blog post

Change-Id: Iee16aac42268ab0d08320fd4931f267382f67c78

Author: wesm

site/_posts/2017-08-16-0.6.0-release.md

@@ -32,12 +32,54 @@ memory format remains stable since the 0.3.x release.
 See the [Install Page][2] to learn how to get the libraries for your
 platform. The [complete changelog][5] is also available.
 
-## Plasma Object Store
+## Plasma Shared Memory Object Store
 
+This release includes the [Plasma Store][7], which you can read more about in
+the linked blog post. This system was originally developed as part of the [Ray
+Project][8] at the [UC Berkeley RISELab][9]. We recognized that Plasma would be
+highly valuable to the Arrow community as a tool for shared memory management
+and zero-copy deserialization. Additionally, we believe we will be able to
+develop a stronger software stack through sharing of IO and buffer management
+code.
 
+The Plasma store is a server application which runs as a separate process. A
+reference C++ client, with Python bindings, is made available in this
+release. Clients can be developed in Java or other languages in the future to
+enable simple sharing of complex datasets through shared memory.
 
-## Arrow Format Additions
+## Arrow Format Addition: Map type
 
+We added a Map logical type to represent ordered and unordered maps
+in-memory. This corresponds to the `MAP` logical type annotation in the Parquet
+format (where maps are represented as repeated structs).
+
+Map is represented as a list of structs. It is the first example of a logical
+type whose physical representation is a nested type. We have not yet created
+implementations of Map containers in any of the implementations, but this can
+be done in a future release.
+
+As an example, the Python data:
+
+```
+data = [{'a': 1, 'bb': 2, 'cc': 3}, {'dddd': 4}]
+```
+
+Could be represented in an Arrow `Map<String, Int32>` as:
+
+```
+Map<String, Int32> = List<Struct<keys: String, values: Int32>>
+  is_valid: [true, true]
+  offsets: [0, 3, 4]
+  values: Struct<keys: String, values: Int32>
+    children:
+      - keys: String
+          is_valid: [true, true, true, true]
+          offsets: [0, 1, 3, 5, 9]
+          data: abbccdddd
+      - values: Int32
+          is_valid: [true, true, true, true]
+          data: [1, 2, 3, 4]
+```
 ## Python Changes
 
 Some highlights of Python development outside of bug fixes and general API
@@ -55,10 +97,6 @@ improvements include:
 
 ## Toward Arrow 1.0.0 and Beyond
 
-We have much work ahead of us to build out Arrow integrations in other data
-systems to improve their processing performance and interoperability with other
-systems.
-
 We are still discussing the roadmap to 1.0.0 release on the [developer mailing
 list][6]. The focus of the 1.0.0 release will likely be memory format stability
 and hardening integration tests across the remaining data types implemented in
@@ -69,3 +107,6 @@ Java and C++. Please join the discussion there.
 [3]: http://github.com/apache/parquet-cpp
 [5]: http://arrow.apache.org/release/0.6.0.html
 [6]: http://mail-archives.apache.org/mod_mbox/arrow-dev/
+[7]: http://arrow.apache.org/blog/2017/08/08/plasma-in-memory-object-store/
+[8]: https://ray-project.github.io/ray/
+[9]: https://rise.cs.berkeley.edu/

site/index.html

@@ -7,10 +7,10 @@ <h1>Apache Arrow</h1>
         <p class="lead">Powering Columnar In-Memory Analytics</p>
         <p>
           <a class="btn btn-lg btn-success" href="mailto:dev-subscribe@arrow.apache.org" role="button">Join Mailing List</a>
-          <a class="btn btn-lg btn-primary" href="{{ site.baseurl }}/install/" role="button">Install (0.5.0 Release - July 23, 2017)</a>
+          <a class="btn btn-lg btn-primary" href="{{ site.baseurl }}/install/" role="button">Install (0.6.0 Release - August 14, 2017)</a>
         </p>
       </div>
-      <h4><strong>Latest News</strong>: <a href="{{ site.baseurl }}/blog/">Apache Arrow 0.5.0 release</a></h4>
+      <h4><strong>Latest News</strong>: <a href="{{ site.baseurl }}/blog/">Apache Arrow 0.6.0 release</a></h4>
       <div class="row">
         <div class="col-lg-4">
           <h2>Fast</h2>