alamb commented on code in PR #6:
URL: https://github.com/apache/datafusion-site/pull/6#discussion_r1686870959
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_posts/2024-07-09-datafusion-40.0.0.md:
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+---
+layout: post
+title: "Apache Arrow DataFusion 40.0.0 Released"
+date: "2024-07-09 00:00:00"
+author: alamb
+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 %}
+-->
+
+<!-- see https://github.com/apache/datafusion/issues/9602 for details -->
+
+## Introduction
+
+We recently [released DataFusion 40.0.0]. This blog highlights some of the many
+major improvements since we [released DataFusion 34.0.0]
+and a preview of where the community is thinking about improving in the next 6
months.
+
+[released DataFusion 34.0.0]:
https://datafusion.apache.org/blog/2024/01/19/datafusion-34.0.0/
+[released DataFusion 40.0.0]: https://crates.io/crates/datafusion/40.0.0
+
+<!-- todo update this intro -->
+[Apache Arrow DataFusion] is an extensible query engine, written in [Rust],
that
+uses [Apache Arrow] as its in-memory format. DataFusion is used by developers
to
+create new, fast data centric systems such as databases, dataframe libraries,
+machine learning and streaming applications. While [DataFusion’s primary design
+goal] is to accelerate creating other data centric systems, it has a
+reasonable experience directly out of the box as a [dataframe library] and
+[command line SQL tool].
+
+[DataFusion’s primary design goal]:
https://arrow.apache.org/datafusion/user-guide/introduction.html#project-goals
+[dataframe library]: https://arrow.apache.org/datafusion-python/
+[command line SQL tool]:
https://arrow.apache.org/datafusion/user-guide/cli.html
+
+
+[apache arrow datafusion]: https://datafusion.apache.org/
+[apache arrow]: https://arrow.apache.org
+[rust]: https://www.rust-lang.org/
+
+DataFusion's core thesis is that as a community together, we can build much
more
+advanced technology than any of us as individuals or companies could do alone.
+Without DataFusion, highly performant vectorized query engines would remain
+the domain of a few large companies and world-class research institutions.
+With DataFusion, we can all build on top of a shared foundation, and focus on
+what makes our projects unique.
+
+
+
+
+# Community Growth 📈
+
+In the last 6 months, between `34.0.0` and `40.0.0`, our community continues to
+grow in new ane exciting ways.
+
+1. DataFusion became a top level Apache Software Foundation project (read the
+ [press release] and [blog post]).
+2. We added several PMC members and new
+ committers [@comphead], [@mustafasrepo], [@ozankabak] joined the PMC,
+ [@jonahgao] and [@lewiszlw] joined as a committer. See the [mailing list]
for
+ more details.
+3. [DataFusion Comet] was [donated] and is nearing its first release.
+4. In the [core DataFusion repo] alone we reviewed and accepted almost 1500
PRs from 182 different
+ committers, created over 1000 issues and closed 781 of them 🚀. This is up
from
+ 1000 PRs from 124 committers with 650 issues created in our last post 🤯. You
+ can find a list of all changes in the detailed [CHANGELOG].
+5. DataFusion meetups in multiple cities around the world: [Austin], [San
Francisco],
+ [Hangzhou], [New York], and [Belgrade].
+6. Many new projects in the [datafusion-contrib] organization, including
+ [Table Providers], [SQL Lancer], [Open Variant], [JSON], and [ORC].
+
+[core DataFusion repo]: https://github.com/apache/arrow-datafusion
+[CHANGELOG]:
https://github.com/apache/datafusion/blob/main/datafusion/CHANGELOG.md
+[press release]:
https://news.apache.org/foundation/entry/apache-software-foundation-announces-new-top-level-project-apache-datafusion
+[blog post]: https://datafusion.apache.org/blog/2024/05/07/datafusion-tlp/
+[@comphead]: https://github.com/comphead
+[@mustafasrepo]: https://github.com/mustafasrepo
+[@ozankabak]: https://github.com/ozankabak
+[@jonahgao]: https://github.com/jonahgao
+[@lewiszlw]: https://github.com/lewiszlw
+[mailing list]: https://lists.apache.org/list.html?d...@datafusion.apache.org
+[Austin]: https://github.com/apache/datafusion/discussions/8522
+[San Francisco]: https://github.com/apache/datafusion/discussions/10800
+[Hangzhou]: https://www.huodongxing.com/event/5761971909400?td=1965290734055
+[New York]: https://github.com/apache/datafusion/discussions/11213
+[Belgrade]: https://github.com/apache/datafusion/discussions/11431
+
+[datafusion-contrib]: https://github.com/datafusion-contrib
+[Table Providers]:
https://github.com/datafusion-contrib/datafusion-table-providers
+[SQL Lancer]: https://github.com/datafusion-contrib/datafusion-sqllancer
+[Open Variant]:
https://github.com/datafusion-contrib/datafusion-functions-variant
+[JSON]: https://github.com/datafusion-contrib/datafusion-functions-json
+[ORC]: https://github.com/datafusion-contrib/datafusion-orc
+
+<!--
+$ git log --pretty=oneline 34.0.0..40.0.0 . | wc -l
+ 1453 (up from 1009)
+
+$ git shortlog -sn 34.0.0..40.0.0 . | wc -l
+ 182 (up from 124)
+
+
+https://crates.io/crates/datafusion/34.0.0
+DataFusion 34 released Dec 17, 2023
+
+https://crates.io/crates/datafusion/40.0.0
+DataFusion 34 released July 12, 2024
+
+Issues created in this time: 321 open, 781 closed (up from 214 open, 437
closed)
+https://github.com/apache/arrow-datafusion/issues?q=is%3Aissue+created%3A2023-12-17..2024-07-12
+
+Issues closed: 911 (up from 517)
+https://github.com/apache/arrow-datafusion/issues?q=is%3Aissue+closed%3A2023-12-17..2024-07-12
+
+PRs merged in this time 1490 (up from 908)
+https://github.com/apache/arrow-datafusion/pulls?q=is%3Apr+merged%3A2023-12-17..2024-07-12
+
+-->
+
+
+In addition, DataFusion has been appearing in more and more writing, both
online and offline. Here are some highlights:
+
+1. [Apache Arrow DataFusion: A Fast, Embeddable, Modular Analytic Query
Engine], was presented in [SIGMOD '24], one of the major database conferences
+2. DataFusion described as part of the trend to define "the POSIX of
databases" in ["What Goes Around Comes Around... And Around...] from Andy Pavlo
and Mike Stonebraker
+3. ["Why you should keep an eye on Apache DataFusion and its community"]
+4. [Apache DataFusion offline meetup in the Bay Area]
+
+
+[DataFusion Comet]: https://datafusion.apache.org/comet/
+[donated]: https://arrow.apache.org/blog/2024/03/06/comet-donation/
+[SIGMOD '24]: https://2024.sigmod.org/
+
+
+[Apache Arrow DataFusion: A Fast, Embeddable, Modular Analytic Query Engine]:
https://dl.acm.org/doi/10.1145/3626246.3653368
+["What Goes Around Comes Around... And Around...]:
https://db.cs.cmu.edu/papers/2024/whatgoesaround-sigmodrec2024.pdf
+["Why you should keep an eye on Apache DataFusion and its community"]:
https://www.cpard.xyz/posts/datafusion/
+[Apache DataFusion offline meetup in the Bay Area]:
https://www.tisonkun.org/2024/07/15/datafusion-meetup-san-francisco/
+
+
+# Improved Performance 🚀
+
+Performance is a key feature of DataFusion, and the community continues to work
+to keep DataFusion state of the art in this area. One major area DataFusion
+improved is the time it takes to convert a SQL query into a plan that can be
+executed. Planning is now almost 2x faster for TPC-DS and TPC-H queries, and
+over 10x faster for some queries with many columns.
+
+Here is a chart showing the improvement due to the concerted effort of
+many contributors (TODO list contributors by name) over several months (see
+[ticket] for more details)
+
+<img src="{{ site.baseurl
}}/assets/datafusion-40.0.0/improved-planning-time.png" width="700">
+
+[ticket]: https://github.com/apache/datafusion/issues/9637
+
+Also, we implemented [specialization for single
Uft8/LargeUtf8/Binary/LargeBinary]
+group by columns which resulted in a 40% performance improvement for some
+benchmarks.
+
+[specialization for single Uft8/LargeUtf8/Binary/LargeBinary]:
https://github.com/apache/datafusion/pull/8827
+
+We are also in the final phases of our initial integration of the new [Arrow
+StringView] which will provide a significant performance improvement
+for many workloads. This feature should be available in future versions of
DataFusion.
+Kudos to [@XiangpengHong], [@PsiACE], [@Weigju>XXXX] and
+[@AriesDevil], and [@alamb] for driving this along.
+
+[Arrow StringView]:
https://docs.rs/arrow/latest/arrow/array/struct.GenericByteViewArray.html
+
+
+# Improved Quality 📋
+
+DataFusion continues to improve overall in quality. One of the most exciting
+improvements is the addition of a new [SQLancer] based [DataFusion Fuzzing]
+suite thanks to [@2010YOUY01] that has already found several bugs (kudos to
[@jonahgao],
+YYY, and ZZZ for fixing them so fast).
+
+[SQLancer]: https://github.com/apache/datafusion/issues/11030
+[DataFusion Fuzzing]:
https://github.com/datafusion-contrib/datafusion-sqllancer
+[@2010YOUY01]: https://github.com/2010YOUY01
+
+
+## Improved Documentation 📚
+
+We continue to improve the documentation to make it easier to get started
using DataFusion with
+the [Library Users Guide], [API documentation], and [Examples].
+
+Some notable new examples include:
+* [sql_analysis.rs] to analyse SQL queries with DataFusion structures (thanks
[@LorrensP-2158466])
+* [plan_to_sql.rs] to generate SQL from DataFusion Expr and LogicalPlan
(thanks [@edmondop])
+
+[Library Users Guide]:
https://datafusion.apache.org/library-user-guide/index.html
+[API documentation]: https://docs.rs/datafusion/latest/datafusion/index.html
+[Examples]: https://github.com/apache/datafusion/tree/main/datafusion-examples
+[sql_analysis.rs]:
https://github.com/apache/datafusion/blob/main/datafusion-examples/examples/sql_analysis.rs
+[plan_to_sql.rs]:
https://github.com/apache/datafusion/blob/main/datafusion-examples/examples/plan_to_sql.rs
+[@LorrensP-2158466]: https://github.com/LorrensP-2158466
+[@edmondop]: https://github.com/edmondop
+
+# New Features ✨
+
+There are too many new features in the last 6 months to list them all, but here
+are some highlights:
+
+## SQL
+* Support for unnest (TODO LINK)
+* Support Recursive CTEs https://github.com/apache/datafusion/pull/9619 /
https://github.com/apache/datafusion/issues/462
Review Comment:
fixex
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