pitrou commented on code in PR #547:
URL: https://github.com/apache/arrow-site/pull/547#discussion_r1814691014
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_posts/2024-10-16-18.0.0-release.md:
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+---
+layout: post
+title: "Apache Arrow 18.0.0 Release"
+date: "2024-10-16 00:00:00"
+author: pmc
+categories: [release]
+---
+<!--
+{% comment %}
+Licensed to the Apache Software Foundation (ASF) under one or more
+contributor license agreements. See the NOTICE file distributed with
+this work for additional information regarding copyright ownership.
+The ASF licenses this file to you under the Apache License, Version 2.0
+(the "License"); you may not use this file except in compliance with
+the License. You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+{% endcomment %}
+-->
+
+
+The Apache Arrow team is pleased to announce the 18.0.0 release. This covers
+over 3 months of development work and includes [**XXX resolved issues**][1]
+on [**YYY distinct commits**][2] from [**ZZZ distinct contributors**][2].
+See the [Install Page](https://arrow.apache.org/install/)
+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].
+
+## Community
+
+Since the 17.0.0 release, JJJJJ has been invited to be committer.
+No new members have joined the Project Management Committee (PMC).
+
+Thanks for your contributions and participation in the project!
+
+## Columnar format
+
+The Arrow columnar format now allows 32-bit and 64-bit decimal data, in
+addition to the already existing 128-bit and 256-bit decimal data types
+(GH-43956).
+
+## Linux packages notes
+
+Azure file system is enabled.
+
+## C Data Interface notes
+
+
+## Arrow Flight RPC notes
+
+**Flight UCX is deprecated.** We plan to remove this experiment in the next
couple of releases.
+
+The Java implementation now transparently handles compressed Arrow data when
reading, instead of requiring explicit configuration. (GH-43469)
+
+The Ruby bindings now support implementing DoPut on the server. (GH-43814)
+
+## C++ notes
+
+The default memory pool has changed to mimalloc on all platforms (GH-43254).
+Previously, jemalloc was used by default on Linux. Using mimalloc by default
+provides a more consistent experience accross different platforms, and
+makes configuration easier. It is expected that this might either increase
+or decrease performance on user workloads that use the default memory pool;
+please benchmark accordingly. Jemalloc can still be selected by setting
+the `ARROW_DEFAULT_MEMORY_POOL` environment variable to "jemalloc".
+
+A new class `arrow::ArrayStatistics` has been added to encode basic statistics
+about an Arrow array. It provides a source-agnostic representation for
statistics
+provided by third-party sources such as Parquet files (GH-41909).
+
+The new Decimal32 and Decimal64 types have been made available (GH-43956).
+
+Several canonical extension types have been implemented:
+- the
[Opaque](https://arrow.apache.org/docs/dev/format/CanonicalExtensions.html#opaque)
extension type (GH-43454);
+- the [8-bit
boolean](https://arrow.apache.org/docs/dev/format/CanonicalExtensions.html#bit-boolean)
extension type (GH-17682);
+- the
[UUID](https://arrow.apache.org/docs/dev/format/CanonicalExtensions.html#uuid)
extension type (GH-15058);
+- the
[JSON](https://arrow.apache.org/docs/dev/format/CanonicalExtensions.html#json)
extension type (GH-32538).
+
+### Acero
+
+- Enhanced the row-oriented representation by widening the offset type from
32-bit to 64-bit, resolving crashes and data corruption in aggregation and hash
join on large datasets due to offset overflow (GH-43495).
+- Improved ordered aggregation performance by reducing complexity from
`O(n*m)` to `O(n)`, where `n` is the number of rows and `m` the number of
segments in the batch (GH-44052).
+
+### Compute
+
+Casting between string-like and string-view-like types has been implemented
(GH-42247).
+
+### Dataset
+
+
+### Filesystems
+
+Writing small files to S3 now uses a single S3 API call instead of three
+(GH-40557). Files larger than 5 MB still go through the regular multipart
+upload mechanism.
Review Comment:
```suggestion
Writing small files to S3 can use a single S3 API call instead of three,
provided the new option `allow_delayed_open` is enabled (GH-40557).
Files larger than 5 MB still go through the regular multipart
upload mechanism.
```
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