pitrou commented on a change in pull request #63:
URL: https://github.com/apache/arrow-site/pull/63#discussion_r456640654
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File path: _posts/2020-07-16-1.0.0-release.md
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+---
+layout: post
+title: "Apache Arrow 1.0.0 Release"
+date: "2020-07-16 00:00:00 -0600"
+author: pmc
+categories: [release]
+---
+<!--
+{% comment %}
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+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
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+{% endcomment %}
+-->
+
+The Apache Arrow team is pleased to announce the 1.0.0 release. This covers
+over 2 months of development work and includes [**XX resolved issues**][1]
+from [**XX distinct contributors**][2]. See the Install Page to learn how to
+get the libraries for your platform.
+
+The release notes below are not exhaustive and only expose selected highlights
+of the release. Many other bugfixes and improvements have been made: we refer
+you to the [complete changelog][3].
+
+## 1.0 Format Release
+
+The Arrow format received several changes and additions, leading to the
+1.0 format version:
+
+* The metadata version was bumped to a new version V5, indicating an
+ incompatible change in the buffer layour of Union types (ARROW-9258).
+ All other types keep the same layout as in V4.
+
+* Dictionary indices are now allowed to be unsigned rather than signed
+ (ARROW-9259). Using UInt64 is still discouraged because of poor Java
+ support.
+
+* A "Feature" enum has been added to announce the use of specific optional
+ features in an IPC stream, such as buffer compression (ARROW-9308). This
+ new field is not used by any implementation yet.
+
+* Optional buffer compression using LZ4 or ZStandard was added to the IPC
+ format (ARROW-300).
+
+* Decimal types now have an optional "bitWidth" field, defaulting to 128
+ (ARROW-8985). This will allow for future support of other decimal widths
+ such as 32- and 64-bit.
+
+The 1.0 major release indicates that the Arrow columnar format is declared
+stable, with [forward and backward compatibility guarantees][5].
+
+Integration testing has been expanded to test for extension types and
+nested dictionaries.
+
+XXX Link to implementation matrix
+
+Format changes: unions, unsigned int dictionary indices, decimal bit width,
feature enum.
+
+## Community
+
+Since the last release, we have added two new committers:
+
+* Liya Fan
+* Ji Liu
+
+Thank you for all your contributions!
+
+<!-- Acknowledge and link to any new committers and PMC members since the last
release. See previous release announcements for examples. -->
+
+## Arrow Flight RPC notes
+
+Flight now offers DoExchange, a fully bidirectional data endpoint, in addition
+to DoGet and DoPut, in C++, Java, and Python. Middlewares in all languages now
+expose binary-valued headers. Additionally, servers and clients can set Arrow
+IPC read/write options in all languages, making compatibility easier with
earlier
+versions of Arrow Flight.
+
+In C++ and Python, Flight now exposes more options from gRPC, including the
+address of the client (on the server) and the ability to set low-level gRPC
+client options. Flight also supports mutual TLS authentication and the ability
+for a client to control the size of a data message on the wire.
+
+## C++ notes
+
+Support for static linking with Arrow has been vastly improved, including the
+introduction of a `libarrow_bundled_dependencies.a` library bundling all
+required dependencies together (ARROW-7605).
+
+Following the Arrow format changes, Union arrays cannot have a top-level
+bitmap anymore (ARROW-9278; see also the IPC changes below).
+
+A number of improvements were made to reduce the overall code size in the
+Arrow library.
+
+A convenience API `GetBuildInfo` allows querying the characteristics of
+the Arrow library (ARROW-6521). We encourage you to suggest any desired
+addition to the returned information.
+
+We added an optional dependency to the `utf8proc` library, used in several
+compute functions (ARROW-8961; see below).
+
+Instead of sharing the same concrete classes, sparse and dense unions now
+have separated classes (`SparseUnionType` and `DenseUnionType`, as well
+as `SparseUnionArray`, `DenseUnionArray`, `SparseUnionScalar`,
+`DenseUnionScalar`; ARROW-8866).
+
+Arrow can now be built for iOS using the right set of CMake options, though
+we don't officially support it (ARROW-8795). See
+[this
writeup](https://github.com/UnfoldedInc/deck.gl-native-dependencies/blob/master/docs/iOS-BUILD.md#arrow-v0170)
+for details.
+
+### Compute functions
+
+The compute kernel layer was extensively reworked (ARROW-8792). It now offers
+a generic function lookup, dispatch and execution mechanism. Furthermore,
+elaborate internal scaffoldings make it vastly easier to write new function
+kernels.
+
+Several compute functions have been added. Unicode-compliant predicates and
+transforms, such as lowercase and uppercase transforms, are now available.
+
+The available compute functions are listed exhaustively in the Sphinx-generated
+documentation.
+
+### Datasets
+
+Datasets can now be read from CSV files (ARROW-7759).
+
+### Feather
+
+The Feather format is now available in version 2, which is simply the Arrow
+IPC file format with another name.
+
+### IPC
+
+By default, we now write IPC streams with metadata V5. However, metadata V4
+can be requested by setting the appropriate member in `IpcWriteOptions`.
+
+V4 as well as V5 metadata IPC streams can be read properly, with one
+exception: a V4 metadata stream containing Union arrays with top-level
+null values will refuse reading.
+
+Support for dictionary replacement and dictionary delta was implemented
+(ARROW-7285).
+
+### Parquet
+
+Writing files with the LZ4 codec is disabled, because it produces files
+incompatible with the widely-used Hadoop Parquet implementation (ARROW-9424).
+Support will be reenabled once we align the LZ4 implementation with the
+special buffer encoding expected by Hadoop.
+
+## C# notes
+
+## Go notes
+
+## Java notes
+
+## JavaScript notes
+
+## Python notes
+
+The size of wheel packages is significantly reduced. One side effect is
+that these wheels do not enable Gandiva anymore (ARROW-5082).
+
+The Scalar class hierarchy was reworked to more closely follow its C++
+counterpart (ARROW-9017).
+
+TLS CA certificates are looked up more reliably when using the S3 filesystem,
+especially with manylinux wheels (ARROW-9261).
+
+The encoding of CSV files can now be specified explicitly, defaulting to UTF8
+(ARROW-9106). Custom timestamp parsers can now be used for CSV files
+(ARROW-8711).
+
+Filesystems can now be implemented in pure Python (ARROW-8766). As a result,
+[fsspec](https://filesystem-spec.readthedocs.io)-based filesystems can now
+be used in datasets (ARROW-9383).
+
+## R notes
+
+The R package added support for converting to and from many additional Arrow
types. Tables showing how R types are mapped to Arrow types and vice versa have
been added to the [introductory vignette][6], and nearly all types are handled.
In addition, R `attributes` like custom classes and metadata are now preserved
when converting a `data.frame` to an Arrow Table and are restored when loading
them back into R.
Review comment:
Please, can text be properly word-wrapped at ~80 characters for easier
review and editing?
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