jorisvandenbossche commented on code in PR #382:
URL: https://github.com/apache/arrow-site/pull/382#discussion_r1272477529
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_posts/2023-07-17-13.0.0-release.md:
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+---
+layout: post
+title: "Apache Arrow 13.0.0 Release"
+date: "2023-07-17 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 13.0.0 release. This covers
+over 3 months of development work and includes [**XXX resolved issues**][1]
+from [**YYY 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 12.0.0 release, Marco Neumann, Gang Wu, Mehmet Ozan Kabak and Kevin
Gurney
+have been invited to be committers.
+Matt Topol, Jie Wen, Ben Baumgold and Dewey Dunnington have joined the
+Project Management Committee (PMC).
+
+Thanks for your contributions and participation in the project!
+
+## Columnar Format Notes
+
+The [run-end encoded
layout](https://arrow.apache.org/docs/dev/format/Columnar.html#run-end-encoded-layout)
+has been added. This layout can allow data with long runs of duplicate values
to be encoded and processed
+efficiently. Initial support has been added for
[C++](https://github.com/apache/arrow/pull/14179) and
+[Go](https://github.com/apache/arrow/pull/14223).
+
+### C Device Data Interface
+
+An **experimental** new specification, the
+[C Device Data
Interface](https://arrow.apache.org/docs/dev/format/CDeviceDataInterface.html),
+has been accepted for inclusion (GH-34971). It builds on the existing
+C Data Interface to provide a runtime-agnostic zero-copy sharing mechanism
+for Arrow data residing on non-CPU devices.
+
+Reference implementations of the C Device Data Interface will progressively
+be added to the standard Arrow libraries after the 13.0.0 release.
+
+## Arrow Flight RPC notes
+
+Support for flagging ordered result sets to clients is now added.
([#34852](https://github.com/apache/arrow/issues/34852))
+
+gRPC 1.30 is now the minimum supported version in C++/Python/R/etc.
([#34679](https://github.com/apache/arrow/issues/36479))
+
+In C++, various methods now receive a full `ServerCallContext`
([#35442](https://github.com/apache/arrow/issues/35442),
[#35377](https://github.com/apache/arrow/issues/35377)) and the context now
exposes headers sent by the client
([#35375](https://github.com/apache/arrow/issues/35375)).
+
+## C++ notes
+
+### Building
+
+CMake 3.16 or later is now required for building Arrow C++ (GH-34921).
+
+Optimizations are not disabled anymore when the `RelWithDebInfo` build type
+is selected (GH-35850). Furthermore, compiler flags can now properly be
+customized per-build type using `ARROW_C_FLAGS_DEBUG`, `ARROW_CXX_FLAGS_DEBUG`
+and related variables (GH-35870).
+
+### Acero
+
+Handling of unaligned buffers is input nodes can be configured programmatically
+or by setting the environment variable `ACERO_ALIGNMENT_HANDLING`. The default
+behavior is to warn when an unaligned buffer is detected (GH-35498).
+
+### Compute
+
+Several new functions have been added:
+* aggregate functions "first", "last", "first_last" (GH-34911);
+* vector functions "cumulative_prod", "cumulative_min", "cumulative_max"
(GH-32190);
+* vector function "pairwise_diff" (GH-35786).
+
+Sorting now works on dictionary arrays, with a much better performance than
+the naive approach of sorting the decoded dictionary (GH-29887). Sorting also
+works on struct arrays, and nested sort keys are supported using `FieldRed`
(GH-33206).
+
+The `check_overflow` option has been removed from `CumulativeSumOptions` as
+it was redundant with the availability of two different functions:
+"cumulative_sum" and "cumulative_sum_checked" (GH-35789).
+
+Run-end encoded filters are efficiently supported (GH-35749).
+
+Duration types are supported with the "is_in" and "index_in" functions
(GH-36047).
+They can be multiplied with all integer types (GH-36128).
+
+"is_in" and "index_in" now cast their inputs more flexibly: they first attempt
+to cast the value set to the input type, then in the other direction if the
+former fails (GH-36203).
+
+Multiple bugs have been fixed in "utf8_slice_codeunits" when the `stop` option
+is omitted (GH-36311).
+
+### Dataset
+
+A custom schema can now be passed when writing a dataset (GH-35730). The custom
+schema can alter nullability or metadata information, but is not allowed to
+change the datatypes written.
+
+### Filesystems
+
+The S3 filesystem now writes files in equal-sized chunks, for compatibility
with
+Cloudflare's "R2" Storage (GH-34363).
+
+A long-standing issue where S3 support could crash at shutdown because of
resources
+still being alive after S3 finalization has been fixed (GH-36346). Now,
attempts
+to use S3 resources (such as making filesystem calls) after S3 finalization
should
+result in a clean error.
+
+The GCS filesystem accepts a new option to set the project id (GH-36227).
+
+### IPC
+
+Nullability and metadata information for sub-fields of map types is now
preserved
+when deserializing Arrow IPC (GH-35297).
+
+### Orc
+
+The Orc adapter now maps Arrow field metadata to Orc type attributes when
writing,
+and vice-versa when reading (GH-35304).
+
+### Parquet
+
+It is now possible to write additional metadata while a `ParquetFileWriter` is
+open (GH-34888).
+
+Writing a page index can be enabled selectively per-column (GH-34949).
+In addition, page header statistics are not written anymore if the page
+index is enabled for the given column (GH-34375), as the information would
+be redundant and less efficiently accessed.
+
+Parquet writer properties allow specifying the sorting columns (GH-35331).
+The user is responsible for ensuring that the data written to the file
+actually complies with the given sorting.
+
+CRC computation has been implemented for v2 data pages (GH-35171).
+It was already implemented for v1 data pages.
+
+Writing compliant nested types is now enabled by default (GH-29781). This
+should not have any negative implication.
+
+Attempting to load a subset of an Arrow extension type is now forbidden
+(GH-20385). Previously, if an extension type's storage is nested (for example
+a "Point" extension type backed by a `struct<x: float64, y: float64>`),
+it was possible to load selectively some of the columns of the storage type.
+
+### Substrait
+
+Support for various functions has been added: "stddev", "variance", "first",
+"last" (GH-35247, GH-35506).
+
+Deserializing sorts is now supported (GH-32763). However, some features,
+such as clustered sort direction or custom sort functions, are not
+implemented.
+
+### Miscellaneous
+
+`FieldRef` sports additional methods to get a flattened version of nested
+fields (GH-14946). Compared to their non-flattened counterparts,
+the methods `GetFlattened`, `GetAllFlattened`, `GetOneFlattened` and
+`GetOneOrNoneFlattened` combine a child's null bitmap with its ancestors'
+null bitmaps such as to compute the field's overall logical validity bitmap.
+
+In other words, given the struct array `[null, {'x': null}, {'x': 5}]`,
+`FieldRef("x")::Get` might return `[0, null, 5]`
+while `FieldRef("y")::GetFlattened` will *always* return `[null, null, 5]`.
+
+`Scalar::hash()` has been fixed for sliced nested arrays (GH-35360).
+
+A new floating-point to decimal conversion algorithm exhibits much better
+precision (GH-35576).
+
+It is now possible to cast between scalars of different list-like types
+(GH-36309).
+
+## C# notes
+
+### Enhancements
+
+* The [C Data
Interface](https://arrow.apache.org/docs/format/CDataInterface.html) is now
supported in the .NET Apache.Arrow library. The main entry points are
`CArrowArrayImporter.ImportArray`, `CArrowArrayExporter.ExportArray`,
`CArrowArrayStreamImporter.ImportArrayStream`, and
`CArrowArrayStreamExporter.ExportArrayStream` in the `Apache.Arrow.C`
namespace. ([GH-33856](https://github.com/apache/arrow/issues/33856),
[GH-33857](https://github.com/apache/arrow/issues/33857),
[GH-36120](https://github.com/apache/arrow/issues/36120), and
[GH-35809](https://github.com/apache/arrow/issues/35809)).
+
+* `ArrowBuffer.BitmapBuilder` adds `Append(ReadOnlySpan<byte> source, int
validBits)` and `AppendRange(bool value, int length)` to improve performance of
array concatenation ([GH-32605](https://github.com/apache/arrow/issues/32605))
+
+### Bug Fixes
+
+* TotalBytes and TotalRecords are now being serialized in FlightInfo
([GH-35267](https://github.com/apache/arrow/issues/35267))
+## Go notes
+
+### Enhancements
+
+#### Arrow
+
+* Compute arithmetic functions are now available for Float16
([GH-35162](https://github.com/apache/arrow/issues/35162))
+* Float16, Large* and Fixed types are all now supported by the CSV
reader/writer ([GH-36105](https://github.com/apache/arrow/issues/36105) and
[GH-36141](https://github.com/apache/arrow/issues/36141))
+* CSV Reader uses `AppendValueFromString` for extension types and properly
reads empty values as null
([GH-35188](https://github.com/apache/arrow/issues/35188) and
[GH-35190](https://github.com/apache/arrow/issues/35190))
+* [Substrait](https://github.com/substrait-io/substrait-go) expressions can
now be executed using the Compute library
([GH-35652](https://github.com/apache/arrow/issues/35652))
+* You can now read back values from Dictionary Builders before finishing the
array ([GH-35711](https://github.com/apache/arrow/issues/35711))
+* `MapType.ValueField` and `MapType.ValueType` are now deprecated in favor of
`MapType.Elem().(*StructType)`
([GH-35909](https://github.com/apache/arrow/issues/35909))
+* Multiple equality functions which have been deprecated since v9 have now
been removed (Such as `array.ArraySliceEqual` in favor of `array.SliceEqual`)
([GH-36198](https://github.com/apache/arrow/issues/36198))
+* `ValueStr` method on Timestamp arrays now includes the zone in the output
([GH-36568](https://github.com/apache/arrow/issues/36568))
+* *BREAKING CHANGE* `FixedSizeListBuilder.AppendNull` no longer requires
manually appending nulls to the underlying list
([GH-35482](https://github.com/apache/arrow/issues/35482))
+
+#### Flight
+
+* FlightSQL driver supports non-prepared queries now
([GH-35136](https://github.com/apache/arrow/issues/35136))
+
+#### Parquet
+
+* Error messages in row group writer have been improved
([GH-36319](https://github.com/apache/arrow/issues/36319))
+
+### Bug Fixes
+
+* Cross architecture build failures with v12.0.1 have been fixed
([GH-36052](https://github.com/apache/arrow/issues/36052))
+
+#### Arrow
+
+* It is now possible to build the Arrow Go lib using tinygo for building
smaller WASM binaries ([GH-32832](https://github.com/apache/arrow/issues/32832))
+* `Fields` method for Schema and StructType now returns a copy of the slice to
ensure immutability ([GH-35306](https://github.com/apache/arrow/issues/35306)
and [GH-35866](https://github.com/apache/arrow/issues/35866))
+* `array.ApproxEqual` for Maps now allows entries for a given element to be
presented in any order
([GH-35828](https://github.com/apache/arrow/issues/35828))
+* Fix issues with decimal256 arrays
([GH-35911](https://github.com/apache/arrow/issues/35911),
[GH-35965](https://github.com/apache/arrow/issues/35965), and
[GH-35975](https://github.com/apache/arrow/issues/35975))
+* StructType now allows duplicate field names correctly
([GH-36014](https://github.com/apache/arrow/issues/36014))
+
+#### Flight
+
+* Fix crash in client middleware
([GH-35240](https://github.com/apache/arrow/issues/35240))
+
+#### Parquet
+
+* Various memory leaks addressed in pqarrow package
([GH-35015](https://github.com/apache/arrow/issues/35015))
+* Fixed panic for `ListOf(types)` if null
([GH-35684](https://github.com/apache/arrow/issues/35684))
+
+
+## Java notes
+
+The JNI bindings for Arrow Dataset now support execute
[Substrait](https://substrait.io/) plans via the
[Acero](https://arrow.apache.org/docs/dev/cpp/streaming_execution.html) query
engine. ([#34223](https://github.com/apache/arrow/issues/34223))
+
+Arrow packages that depend on Netty (most notably, `arrow-memory-netty`, but
also Arrow Flight) now require Netty 4.1.94.Final at a minimum.
([#36209](https://github.com/apache/arrow/issues/36209))
+
+`VectorSchemaRoot#slice` now always makes a copy, including when the slice
covers all rows (previously it did not make a copy in this case). This is a
potentially-breaking change if your application depended on the old behavior.
([#35275](https://github.com/apache/arrow/issues/35275))
+
+Debug info for allocations is no longer automatically enabled when assertions
are enabled (e.g. when running unit tests). Instead, support must be explicitly
enabled. This is not quite a breaking change, but may be surprising if you are
used to using this information while debugging tests. However, performance
should be greatly improved while running tests.
([#34338](https://github.com/apache/arrow/issues/34338))
+
+Support for the upcoming Java 21 was added, though we do not yet test this in
CI ([#5053](https://github.com/apache/arrow/issues/35053)). The JNI bindings
for Arrow Dataset now expose JSON support
([#36421](https://github.com/apache/arrow/issues/36421)). Dictionary
replacement is now supported when writing the IPC stream format
([#18547](https://github.com/apache/arrow/issues/18547)).
+
+## JavaScript notes
+
+## Python notes
+
+Compatibility notes:
+
+* The default format version for Parquet has been bumped from 2.4 to 2.6
[GH-35746](https://github.com/apache/arrow/issues/35746)
Review Comment:
```suggestion
* The default format version for Parquet has been bumped from 2.4 to 2.6
[GH-35746](https://github.com/apache/arrow/issues/35746). In practice, this
means that nanosecond timestamps now preserve its resolution instead of being
converted to microseconds.
```
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