News - 16 series — Groonga v16.0.5 documentation

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# News - 16 series

## Release 16.0.5 - 2026-05-22

### Fixes

#### Fixed a bug where Groonga for Windows failed to run due to a missing required DLL

The required DLL (`msvcp140_atomic_wait.dll`) for Groonga for Windows was missing from the `groonga-16.0.2-x64-vs2022-with-vcruntime.zip`.

This issue only affects Groonga 16.0.2 for Windows.

## Release 16.0.2 - 2026-05-07

### Improvements

#### Added support for Ubuntu 26.04 LTS

### Fixes

#### Fixed the ODR(One Definition Rule) violation

GH-2787 Reported by Nicolas PARLANT.

The LTO(Link-Time Optimization) build was failing because `grn_tokenizer_query` had two different definitions. This change fixes the ODR violation, allowing the LTO process to complete successfully.

#### Fixed missing files in benchmark directory of source archive

GH-2793 Reported by Nicolas PARLANT.

The missing files are as follows:

- groonga/benchmark/CMakeLists.txt

- groonga/benchmark/bench-distance.c

- groonga/benchmark/geo-distance-summary.rb

#### Fixed a bug where duplicate “tools” directories were created

GH-2798 Reported by Kentaro Hayashi.

Fixed an issue where duplicate “tools” directories were created as below when installing the groonga-tools package on AlmaLinux and Amazon Linux:

    /usr/share/groonga/tools/tools/

### Thanks

- Nicolas PARLANT

- Kentaro Hayashi

## Release 16.0.1 - 2026-03-30

### Improvements

#### [language_model_vectorize] Added `prefix` option

You can now add a prefix to the input text. This is useful for models that require a prefix, similar to the `passage_prefix` and `query_prefix` options of `TokenLanguageModelKNN`.

    language_model_vectorize("hf:///groonga/multilingual-e5-base-Q4_K_M-GGUF", \
                             "male child", \
                             {"prefix": "query: "})

#### [object_list] Added normalizer information to the output

`object_list` command now includes a `normalizers` field in the output for each table.

### Fixes

#### [HTTP] Fixed a false error for chunked HTTP requests

Fixed a bug where valid chunked HTTP requests could fail with an error under certain conditions.

This issue could only occur when a chunked request body was split across multiple receives in a very specific pattern, so most users would never encounter it. If it did occur during a `load` command, the load would only be partially completed and would need to be re-executed.

No index corruption occurs due to this bug.

#### Fixed a bug that caused a crash due to using the wrong free function

Fixed a bug where `grn_obj_unlink()` was used instead of `GRN_OBJ_FIN()` for bulk objects. This could cause a crash in some cases.

Reported by Daniel Black

See also: https://jira.mariadb.org/browse/MDEV-39098

### Experimental features

> These features are still experimental and unstable. We must not use these features in production.

#### [Data types] Added support for arrays and objects in `JSON` type

The `JSON` type now supports arrays and objects, including nested ones. All JSON value types are now supported.

#### Added support for OpenZL compression and decompression for scalar columns and Float32 vector columns

OpenZL compression and decompression are now supported for scalar columns and Float32 vector columns. OpenZL can achieve better compression ratios than Zstandard.

Examples of compression:

The compression of float32 array results for the following data:

- The number of array elements is 40,960.

- The number of records is 10,000.

Results:

- Compress with OpenZL: 1.3GB

- Compress with Zstandard: 1.5GB

- No compress: 1.6GB

#### Added extractor support

Extractors are a new type of module in Groonga that extract plain text from structured data before tokenization.

The built-in `ExtractorHTML` extractor strips HTML tags and decodes HTML entities from a value, leaving only the text content.

Here is an example of using `ExtractorHTML` with the `extract` command:

    extract \
      --extractors 'ExtractorHTML' \
      --value "<html><body>He&lt;ll&gt;o</body></html>"
    [[0,0.0,0.0],{"extracted":"He<ll>o"}]

### Thanks

- Daniel Black

## Release 16.0.0 - 2026-02-09

This is our annual major release! This release doesn’t have any backward incompatible changes! So you can upgrade Groonga without migrating your existing databases. You can still use your existing databases as-is.

### Fixes

#### Fixed a bug that causes overflow in the key of `TABLE_DAT_KEY` tables

If you set a value of 4096 byte against a key, a `TABLE_DAT_KEY` table may be broken.