Release 9.0.2 - 2019-04-29

We provide a package for Windows made from VC++ from this release.

We also provide a package for Windows made form MinGW as in the past. However, we will provide it made from VC++ instead of making from MinGW sooner or later.


  • [column_create] Added a new flag INDEX_LARGE for index column.

    • We can make an index column has space that two times of default by this flag.

    • However, note that it also uses two times of memory usage.

    • This flag useful when index target data are large.

    • Large data must have many records (normally at least 10 millions records) and at least one of the following features.

      • Index targets are multiple columns

      • Index table has tokenizer

  • [object_inspect] Added a new statistics next_physical_segment_id and max_n_physical_segments for physical segment information.

    • We can confirm usage of index column space and max value of index column space by this information.

  • [logical_select] Added support for window function over shard.

  • [logical_range_filter] Added support for window function over shard.

  • [logical_count] Added support for window function over shard.

  • We provided a package for Windows made from VC++.

  • [io_flush] Added a new option --recursive dependent

    • We can all of the specified flush target object, child objects, corresponding table of an index column and corresponding index column are flush target objects.


  • Fixed “unknown type name ‘bool’” compilation error in some environments.

  • Fixed a bug that incorrect output number over Int32 by command of execute via mruby (e.g. logical_select, logical_range_filter, logical_count, etc.). [GitHub#936] [Patch by HashidaTKS]


  • HashidaTKS

Release 9.0.1 - 2019-03-29


  • Added support to acccept null for vector value.

    • You can use select … –columns[vector].flags COLUMN_VECTOR –columns[vector].value “null”

  • [dump] Translated document into English.

  • Added more checks and logging for invalid indexes. It helps to clarify the index related bugs.

  • Improved an explanation about GRN_TABLE_SELECT_ENOUGH_FILTERED_RATIO behavior in news at Release 8.0.6 - 2018-08-29.

  • [select] Added new argument --load_table, --load_columns and --load_values.

    • You can store a result of select in a table that specifying --load_table.

    • --load_values option specifies columns of result of select.

    • --load_columns options specifies columns of table that specifying --load_table.

    • In this way, you can store values of columns that specifying with --load_values into columns that specifying with --load_columns.

  • [select] Added documentation about load_table, load_columns and load_values.

  • [load] Added supoort to display a table of load destination in a query log.

    • A name of table of load destination display as string in [] as below.

    • :000000000000000 load(3): [LoadedLogs][3]

  • Added a new API:

    • grn_ii_get_flags()

    • grn_index_column_diff()

    • grn_memory_get_usage()

  • Added index_column_diff command to check broken index column. If you want to log progress of command execution, set log level to debug.


  • [snippet_html] Changed to return an empty vector for no match.

    • In such a case, an empty vector [] is returned instead of null.

  • Fixed a warning about possibility of counting threads overflow. In real world, it doesn’t affect user because enourmous number of threads is not used. [GitHub#904]

  • Fixed build error on macOS [GitHub#909] [Reported by shiro615]

  • Fixed a stop word handling bug.

    • This bug occurs when we set the first token as a stop word in our query.

    • If this bug occurs, our search query isn’t hit.

  • [Global configurations] Fixed a typo about parameter name of grn_lock_set_timeout.

  • Fixed a bug that deleted records may be matched because of updating indexes incorrectly.

    • It may occure when large number of records is added or deleted.

  • Fixed a memory leak when logical_range_filter returns no records. [GitHub#911] [Patch by HashidaTKS]

  • Fixed a bug that query will not match because of loading data is not normalized correctly. [PGroonga#GitHub#93, GitHub#912,GitHub#913] [Reported by kamicup and dodaisuke]

    • This bug occurs when load data contains whitespace after KATAKANA and unify_kana option is used for normalizer.

  • Fixed a bug that an indexes is broken during updating indexes.

    • It may occurs when repeating to add large number of records or delete them for a long term.

  • Fixed a crash bug that allocated working area is not enough size when updating indexes.


  • shiro615

  • HashidaTKS

  • kamicup

  • dodaisuke

Release 9.0.0 - 2019-02-09

This is a major version up! But It keeps backward compatibility. You can upgrade to 9.0.0 without rebuilding database.


  • [Tokenizers] Added a new tokenizer TokenPattern.

    • You can extract tokens by regular expression.

      • This tokenizer extracts only token that matches the regular expression.

    • You can also specify multiple patterns of regular expression.

  • [Tokenizers] Added a new tokenizer TokenTable.

    • You can extract tokens by a value of columns of existing a table.

  • [dump] Added support for dumping binary data.

  • [select] Added support for similer search against index column.

    • If you have used multi column index, you can similar search against all source columns by this feature.

  • [Normalizers] Added new option remove_blank for NormalizerNFKC100.

    • This option remove white spaces.

  • [groonga executable file] Improve display of thread id in log.

    • Because It was easy to confuse thread id and process id on Windows version, it made clear which is a thread id or a process id.

Release 8.1.1 - 2019-01-29


  • [logical_select] Added new argument --load_table, --load_columns and --load_values.

    • You can store a result of logical_select in a table that specifying --load_table.

    • --load_values option specifies columns of result of logical_select.

    • --load_columns options specifies columns of table that specifying --load_table.

    • In this way, you can store values of columns that specifying with --load_values into columns that specifying with --load_columns.

  • Improve error log when update error of index.

    • Added more information in the log.

      • For example, output source buffer and chunk when occur merge of posting lists error.

      • Also, outputting the log a free space size of a buffer and request size of a buffer when occurs error of allocating a buffer.

  • [groonga executable file] Added a new option --log-flags.

    • We can specify output items of a log of the Groonga.

    • We can output as below items.

      • Timestamp

      • Log message

      • Location(the location where the log was output)

      • Process id

      • Thread id

    • We can specify prefix as below.

      • +

        • This prefix means that “add the flag”.

      • -

        • This prefix means that “remove the flag”.

      • No prefix means that “replace existing flags”.

    • Specifically, we can specify flags as below.

      • none

        • Output nothing into the log.

      • time

        • Output a timestamp into the log.

      • message

        • Output log messages into the log.

      • location

        • Output the location where the log was output( a file name, a line and a function name) and process id.

      • process_id

        • Output a process id into the log.

      • pid

        • This flag is an alias of process_id.

      • thread_id

        • Output thread id into the log.

      • all

        • This flag specifies all flags except none and default flags.

      • default

        • Output a timestamp and log messages into the log.

    • We can also specify multiple log flags by separating flags with |.


  • Fixed a memory leak when occurs index update error.

  • [Normalizers] Fixed a bug that stateless normalizers and stateful normalizers return wrong results when we use them at the same time.

    • Stateless normalizers are below.

      • unify_kana

      • unify_kana_case

      • unify_kana_voiced_sound_mark

      • unify_hyphen

      • unify_prolonged_sound_mark

      • unify_hyphen_and_prolonged_sound_mark

      • unify_middle_dot

    • Stateful normalizers are below.

      • unify_katakana_v_sounds

      • unify_katakana_bu_sound

      • unify_to_romaji

Release 8.1.0 - 2018-12-29


  • [httpd] Updated bundled nginx to 1.15.8.


  • Fixed a bug that unlock against DB is always executed after flush when after execute a io_flush command.

  • Fixed a bug that reindex command doesn’t finish when execute a reindex command against table that has record that has not references.

Release 8.0.9 - 2018-11-29


  • [Tokenizers] Improved that output a tokenizer name in error message when create tokenizer fail.

  • [Tokenizers][TokenDelimit] Supported that customizing delimiter of a token.

    • You can use token other than whitespace as a token of delimiter.

  • [Tokenizers][TokenDelimit] Added new option pattern.

    • You can specify delimiter with regular expression by this option.

  • [Tokenizers] Added force_prefix_search value to each token information.

    • “force_prefix” is kept for backward compatibility.

  • [Token filters] Added built-in token filter TokenFilterNFKC100.

    • You can convert katakana to hiragana like NormalizerNFKC100 with a unify_kana option.

  • [Token filters][TokenFilterStem] Added new option algorithm.

    • You can also stem language other than English(French, Spanish, Portuguese, Italian, Romanian, German, Dutch, Swedish, Norwegian, Danish, Russian, Finnish) by this option.

  • [Token filters][TokenFilterStopWord] Added new option column.

    • You can specify stop word in a column other than is_stop_word column by this option.

  • [dump] Supported output options of token filter options.

    • If you specify a tokenizer like TokenNgram or TokenMecab etc that has options, you can output these options with table_list command.

  • [truncate] Supported a table that it has token filter option.

    • You can truncate even a tabel that it has token filter like TokenFilterStem or TokenStopWord that has options.

  • [schema] Support output of options of token filter.

  • [Normalizers] Added new option for NormalizerNFKC100 that unify_to_romaji option.

    • You can normalize hiragana and katakana to romaji by this option.

  • [query-log][show-condition] Supported “func() > 0” case.

  • [Windows] Improved that ensure flushing on unmap.

  • Improved error message on opening input file error.

  • [httpd] Updated bundled nginx to 1.15.7.

    • contains security fix for CVE-2018-16843 and CVE-2018-16844.


  • Fixed a memory leak when evaluating window function.

  • [groonga-httpd] Fixed bug that log content may be mixed.

  • Fixed a bug that generates invalid JSON when occurs error of slice on output_columns.

  • Fixed a memory leak when getting nested reference vector column value.

  • Fixed a crash bug when outputting warning logs of index corruption.

  • Fix a crash bug when temporary vector is reused in expression evaluation.

    • For example, crash when evaluating an expression that uses a vector as below.

    _score = _score + (vector_size(categories) > 0)

  • Fix a bug that hits a value of vector columns deleted by a delete command.[GitHub PGroonga#85][Reported by dodaisuke]


  • dodaisuke

Release 8.0.8 - 2018-10-29


  • [table_list] Supported output options of default tokenizer.

    • If you specify a tokenizer like TokenNgram or TokenMecab etc that has options, you can output these options with table_list command.

  • [select] Supported normalizer options in sequential match with record @ 'query'.

  • [truncate] Supported a table that it has tokenizer option.

    • You can truncate even a tabel that it has tokenizer like TokenNgram or TokenMecab etc that has options.

  • [Tokenizers][TokenMecab] Added new option target_class

    • This option searches a token of specifying a part-of-speech. For example, you can search only a noun.

    • This option can also specify subclasses and exclude or add specific part-of-speech of specific using + or -. So, you can also search except a pronoun as below.

      'TokenMecab("target_class", "-名詞/代名詞", "target_class", "+")'

  • [io_flush] Supported locking of a database during a io_flush.

    • Because Groonga had a problem taht is a crash when deleteing a table of a target of a io_flush during execution of a io_flush.

  • [cast_loose] Added a new function cast_loose.

    • This function cast to a type to specify. If a value to specify can’t cast, it become to a default value to specify.

  • Added optimize the order of evaluation of a conditional expression.(experimental)

    • You can active this feature by setting environment value as below.


  • Supported (?-mix:XXX) form for index searchable regular expression. [groonga-dev,04683][Reported by Masatoshi SEKI]

    • (?-mix:XXX) form treats the same as XXX.

  • [httpd] Updated bundled nginx to 1.15.5.

  • Supported Ubuntu 18.10 (Cosmic Cuttlefish)


  • Fixed a bug that the Groonga GQTP server may fail to accept a new connection. [groonga-dev,04688][Reported by Yutaro Shimamura]

    • It’s caused when interruption client process without using quit.


  • Masatoshi SEKI

  • Yutaro Shimamura

Release 8.0.7 - 2018-09-29


  • [Tokenizers][TokenMecab] support outputting metadata of Mecab.

    • Added new option include_class for TokenMecab.

      This option outputs class and subclass in Mecab’s metadata.

    • Added new option include_reading for TokenMecab.

      This option outputs reading in Mecab’s metadata.

    • Added new option include_form for TokenMecab.

      This option outputs inflected_type, inflected_form and base_form in Mecab’s metadata.

    • Added new option use_reading for TokenMecab.

      This option supports a search by kana.

      This option is useful for countermeasure of orthographical variants because it searches with kana.

  • [plugin] Groonga now can grab plugins from multiple directories.

    You can specify multiple directories to GRN_PLUGINS_PATH separated with “:” on non Windows, “;” on Windows.

    GRN_PLUGINS_PATH has high priority than the existing GRN_PLUGINS_DIR. Currently, this option is not supported Windows.

  • [Tokenizers][TokenNgram] Added new option unify_alphabet for TokenNgram.

    If we use unify_alphabet as false, TokenNgram uses bigram tokenize method for ASCII character.

  • [Tokenizers][TokenNgram] Added new option unify_symbol for TokenNgram.

    TokenNgram("unify_symbol", false) is same behavior of TokenBigramSplitSymbol.

  • [Tokenizers][TokenNgram] Added new option unify_digit for TokenNgram.

    If we use unify_digit as false, If we set false, TokenNgram uses bigram tokenize method for digits.

  • [httpd] Updated bundled nginx to 1.15.4.


  • Fixed wrong score calculations on some cases.

    • It’s caused when adding, multiplication or division numeric to a bool value.

    • It’s caused when comparing a scalar and vector columns using != or ==.

Release 8.0.6 - 2018-08-29


  • [Tokenizers][TokenMecab] add chunked_tokenize and chunk_size_threshold options.

  • [optimizer] support estimation for query family expressions. It will generate more effective execution plan with query family expressions such as column @ query, column @~ pattern and so on.

  • [optimizer] plug-in -> built-in It’s disabled by default for now. We can enable it by defining GRN_EXPR_OPTIMIZE=yes environment variable or using expression_rewriters table as before.

  • Enable sequential search for enough filtered case by default. If the current result is enough filtered, sequential search is faster than index search. If the current result has only 1% records of all records in a table and less than 1000 records, sequential search is used even when index search is available.

    Cullently, this optimization is applied when search by ==, >, <, >=, or <=.

    When a key of a table that has columns specified by the filter is ShortText, you must set NormalizerAuto to normalizer of the table to apply this optimization.

    You can disable this feature by GRN_TABLE_SELECT_ENOUGH_FILTERED_RATIO=0.0 environment variable.

  • [load] improve error message. Table name is included.

  • [load] add lock_table option. If --lock_table yes is specified, load locks the target table while updating columns and applying --each. This option avoids load and delete conflicts but it’ll reduce load performance.

  • [vector_find] avoid to crash with unsupported modes


  • [index] fix a bug that offline index construction for text vector with HASH_KEY. It creates index with invalid section ID.

  • Fix a bug that --match_columns 'index[0] || index[9]' uses wrong section.

  • [highlighter] fix a wrong highlight bug It’s caused when lexicon is hash table and keyword is less than N of N-gram.

  • [mruby] fix a bug that real error is hidden. mruby doesn’t support error propagation by no argument raise.

  • [Tokenizers][TokenNgram loose]: fix a not found bug when query has only loose types. highlight_html() with lexicon was also broken.

  • Fix a bug that text->number cast ignores trailing garbage. “0garbage” should be cast error.

  • Fix an optimization bug for reference_column >= 'key_value' case

Release 8.0.5 - 2018-07-29


  • [Script syntax] Added complementary explain about similar search against Japanese documents. [GitHub#858][Patch by Yasuhiro Horimoto]

  • [time_classify_day_of_week] Added a new API: time_classify_day_of_week().

  • Suppressed a warning with -fstack-protector. Suggested by OBATA Akio.

  • Added a new API: time_format_iso8601().

  • Exported a struct grn_raw_string.

  • Added a new API: grn_obj_clear_option_values(). It allows you to clear option values on remove (for persistent) / close (for temporary.)

  • [log] Reported index column name for error message [ii][update][one].

  • [httpd] Updated bundled nginx to 1.15.2.

  • [Ubuntu] Dropped Ubuntu 17.10 (Artful Aardvark) support. It has reached EOL at July 19, 2018.

  • [Debian GNU/Linux] Dropped jessie support. Debian’s security and release team will no longer produce updates for jessie.


  • Fixed returning wrong result after unfinished /d/load data by POST.

  • Fixed wrong function call around KyTea.

  • [grndb] Added a missing label for the --force-truncate option.

  • Fixed crash on closing of a database, when a normalizer provided by a plugin (ex. groonga-normalizer-mysql) is used with any option.

  • Fixed a bug that normalizer/tokenizer options may be ignored. It’s occurred when the same object ID is reused.

Release 8.0.4 - 2018-06-29


  • [log] Add sub error for error message [ii][update][one].

  • Added a new API: grn_highlighter_clear_keywords().

  • Added a new predicate: grn_obj_is_number_family_bulk().

  • Added a new API: grn_plugin_proc_get_value_mode().

  • [vector_find] Added a new function vector_find().

  • Suppress memcpy warnings in msgpack.

  • Updated mruby from 1.0.0 to 1.4.1.

  • [doc][grn_obj] Added API reference for grn_obj_is_index_column().

  • [windows] Suppress printf format warnings.

  • [windows] Suppress warning by msgpack.

  • [grn_obj][Plugin] Added encoding converter. rules:

    • grn_ctx::errbuf: grn_encoding

    • grn_logger_put: grn_encoding

    • mruby: UTF-8

    • path: locale

  • [mrb] Added LocaleOutput.

  • [windows] Supported converting image path to grn_encoding.

  • [Tokenizers][TokenMecab] Convert error message encoding.

  • [window_sum] Supported dynamic column as a target column.

  • [doc][grn_obj] Added API reference for grn_obj_is_vector_column().

  • [column_create] Added more validations.

  • [grndb] Disabled log check temporarily. Because it’s not completed yet.


  • [sub_filter] Fixed too much score with a too filtered case.

  • Fixed build error if KyTea is installed.

  • [grndb] Fixed output channel.

  • [query-log][show-condition] Maybe fixed a crash bug.

  • [highlighter][lexicon] Fixed a not highlighted bug. The keyword wasn’t highlighted if keyword length is less than N (“N”-gram. In many cases, it’s Bigram so “less than 2”).

  • [windows] Fixed a base path detection bug. If system locale DLL path includes 0x5c (\ in ASCII) such as “U+8868 CJK UNIFIED IDEOGRAPH-8868” in CP932, the base path detection is buggy.

  • [Tokenizers][TokenNgram] Fixed wrong first character length. It’s caused for “PARENTHESIZED IDEOGRAPH” characters such as “U+3231 PARENTHESIZED IDEOGRAPH STOCK”.

Release 8.0.3 - 2018-05-29


  • [highlight_html] Support highlight of results of the search by NormalizerNFKC100 or TokenNgram.

  • [Tokenizers] Added new option for TokenNgram that report_source_location option . This option used when highlighting with highlight_html use a lexicon.

  • [Normalizers] Added new option for NormalizerNFKC100 that unify_middle_dot option. This option normalizes middle dot. You can search with or without (middle dot) and regardless of position.

  • [Normalizers] Added new option for NormalizerNFKC100 that unify_katakana_v_sounds option. This option normalizes ヴァヴィヴヴェヴォ (katakana) to バビブベボ (katakana). For example, you can search バイオリン (violin) in ヴァイオリン (violin).

  • [Normalizers] Added new option for NormalizerNFKC100 that unify_katakana_bu_sound option. This option normalizes ヴァヴィヴゥヴェヴォ (katakana) to (katakana). For example, you can search セーブル (katakana) and セーヴル in セーヴェル (katakana).

  • [sub_filter] Supported sub_filter optimization for the too filter case. this optimize is valid when records are enough narrowed down before sub_filter execution as below.

  • [groonga-httpd] Made all workers context address to unique. context address is #{ID} of below query log.

  • [delete] Added new options that limit. You can limit the number of delete records as below example. delete --table Users --filter '_key @^ "b"' --limit 4

  • [httpd] Updated bundled nginx to 1.14.0.


  • [logical_select] Fixed memory leak when an error occurs in filtered dynamic columns.

  • [logical_count] Fixed memory leak on initial dynamic column error.

  • [logical_range_filter] Fixed memory leak when an error occurs in dynamic column evaluation.

  • [Tokenizers] Fixed a bug that the wrong source_offset when a loose tokenizing such as loose_symbol option.

  • [Normalizers] Fixed a bug that FULLWIDTH LATIN CAPITAL LETTERs such as U+FF21 FULLWIDTH LATIN CAPITAL LETTER A aren’t normalized to LATIN SMALL LETTERs such as U+0061 LATIN SMALL LETTER A. If you have been used NormalizerNFKC100 , you must recreate your indexes.

Release 8.0.2 - 2018-04-29


  • [grndb][--force-truncate] Improved grndb recover --force-truncate option that it can be truncated even if locks are left on the table.

  • [logical_range_filter] Added sort_keys option.

  • Added a new function time_format(). You can specify time format against a column of Time type. You can specify with use format of strftime .

  • [Tokenizers] Support new tokenizer TokenNgram. You can change its behavior dynamically via options. Here is a list of available options:

    • n : “N” of Ngram. For example, “3” for trigram.

    • loose_symbol : Tokenize keywords including symbols, to be searched by both queries with/without symbols. For example, a keyword “090-1111-2222” will be found by any of “09011112222”, “090”, “1111”, “2222” and “090-1111-2222”.

    • loose_blank : Tokenize keywords including blanks, to be searched by both queries with/without blanks. For example, a keyword “090 1111 2222” will be found by any of “09011112222”, “090”, “1111”, “2222” and “090 1111 2222”.

    • remove_blank : Tokenize keywords including blanks, to be searched by queries without blanks. For example, a keyword “090 1111 2222” will be found by any of “09011112222”, “090”, “1111” or “2222”. Note that the keyword won’t be found by a query including blanks like “090 1111 2222”.

  • [Normalizers] Support new normalizer “NormalizerNFKC100” based on Unicode NFKC (Normalization Form Compatibility Composition) for Unicode 10.0.

  • [Normalizers] Support options for “NormalizerNFKC51” and “NormalizerNFKC100” normalizers. You can change their behavior dynamically. Here is a list of available options:

    • unify_kana : Same pronounced characters in all of full-width Hiragana, full-width Katakana and half-width Katakana are regarded as the same character.

    • unify_kana_case : Large and small versions of same letters in all of full-width Hiragana, full-width Katakana and half-width Katakana are regarded as the same character.

    • unify_kana_voiced_sound_mark : Letters with/without voiced sound mark and semi voiced sound mark in all of full-width Hiragana, full-width Katakana and half-width Katakana are regarded as the same character.

    • unify_hyphen : The characters like hyphen are regarded as the hyphen.

    • unify_prolonged_sound_mark : The characters like prolonged sound mark are regarded as the prolonged sound mark.

    • unify_hyphen_and_prolonged_sound_mark : The characters like hyphen and prolonged sound mark are regarded as the hyphen.

  • [dump] Support output of tokenizer’s options and normalizer’s options. Groonga 8.0.1 and earlier versions cannot import dump including options for tokenizers or normalizers generated by Groonga 8.0.2 or later, and it will occurs error due to unsupported information.

  • [schema] Support output of tokenizer’s options and normalizer’s options. Groonga 8.0.1 and earlier versions cannot import schema including options for tokenizers or normalizers generated by Groonga 8.0.2 or later, and it will occurs error due to unsupported information.

  • Supported Ubuntu 18.04 (Bionic Beaver)


  • Fixed a bug that unexpected record is matched with space only query. [groonga-dev,04609][Reported by satouyuzh]

  • Fixed a bug that wrong scorer may be used. It’s caused when multiple scorers are used as below. --match_columns 'title || scorer_tf_at_most(content, 2.0)'.

  • Fixed a bug that it may also take so much time to change “thread_limit”.


  • satouyuzh

Release 8.0.1 - 2018-03-29


  • [Log] Show filter conditions in query log. It’s disabled by default. To enable it, you need to set an environment variable GRN_QUERY_LOG_SHOW_CONDITION=yes.

  • Install *.pdb into the directory where *.dll and *.exe are installed.

  • [logical_count] Support filtered stage dynamic columns.

  • [logical_count] [post_filter] Added a new filter timing. It’s executed after filtered stage columns are generated.

  • [logical_select] [post_filter] Added a new filter timing. It’s executed after filtered stage columns are generated.

  • Support LZ4/Zstd/zlib compression for vector data.

  • Support alias to accessor such as _key.

  • [logical_range_filter] Optimize window function for large result set. If we find enough matched records, we don’t apply window function to the remaining windows.

    TODO: Disable this optimization for small result set if its overhead is not negligible. The overhead is not evaluated yet.

  • [select] Added match_escalation parameter. You can force to enable match escalation by --match_escalation yes. It’s stronger than --match_escalation_threshold 99999....999 because --match_escalation yes also works with SOME_CONDITIONS && column @ 'query'. --match_escalation_threshold isn’t used in this case.

    The default is --match_escalation auto. It doesn’t change the current behavior.

    You can disable match escalation by --match_escalation no. It’s the same as --match_escalation_threshold -1.

  • [httpd] Updated bundled nginx to 1.13.10.


  • Fixed memory leak that occurs when a prefix query doesn’t match any token. [GitHub#820][Patch by Naoya Murakami]

  • Fixed a bug that a cache for different databases is used when multiple databases are opened in the same process.

  • Fixed a bug that a wrong index is constructed. This occurs only when the source of a column is a vector column and WITH_SECTION isn’t specified.

  • Fixed a bug that a constant value can overflow or underflow in comparison (>,>=,<,<=,==,!=).


  • Naoya Murakami

Release 8.0.0 - 2018-02-09

This is a major version up! But It keeps backward compatibility. You can upgrade to 8.0.0 without rebuilding database.


  • [select] Added --drilldown_adjuster and --drilldowns[LABEL].adjuster. You can adjust score against result of drilldown.

  • [Online index construction] Changed environment variable name GRN_II_REDUCE_EXPIRE_ENABLE to GRN_II_REDUCE_EXPIRE_THRESHOLD.

    GRN_II_REDUCE_EXPIRE_THRESHOLD=0 == GRN_II_REDUCE_EXPIRE_ENABLE=no. GRN_II_REDUCE_EXPIRE_THRESHOLD=-1 uses ii->chunk->max_map_seg / 2 as threshold. GRN_II_REDUCE_EXPIRE_THRESHOLD > 0 uses MIN(ii->chunk->max_map_seg / 2, GRN_II_REDUCE_EXPIRE_THRESHOLD) as threshold. GRN_II_REDUCE_EXPIRE_THRESHOLD=32 is the default.

  • [between] Accept between() without borders. If the number of arguments passed to between() is 3, the 2nd and 3rd arguments are handled as the inclusive edges. [GitHub#685]


  • Fixed a memory leak for normal hash table. [GitHub:mroonga/mroonga#190][Reported by fuku1]

  • Fix a memory leak for normal array.

  • [select] Stopped to cache when output_columns uses not stable function.

  • [Windows] Fixed wrong value report on WSASend error.


  • fuku1

Release 7.1.1 - 2018-01-29


  • [Ubuntu] Dropped Ubuntu 17.04 (Zesty Zapus) support. It has reached EOL at Jan 13, 2018.

  • Added quorum match support. You can use quorum match in both script syntax and query syntax. [groonga-talk,385][Suggested by 付超群]

    TODO: Add documents for quorum match syntax and link to them.

  • Added custom similarity threshold support in script syntax. You can use custom similarity threshold in script syntax.

    TODO: Add document for the syntax and link to it.

  • [grndb][--force-lock-clear] Added --force-lock-clear option. With this option, grndb forces to clear locks of database, tables and data columns. You can use your database again even if locks are remained in database, tables and data columns.

    But this option very risky. Normally, you should not use it. If your database is broken, your database is still broken. This option just ignores locks.

  • [load] Added surrogate pairs support in escape syntax. For example, \uD83C\uDF7A is processed as 🍺.

  • [Windows] Changed to use sparse file on Windows. It reduces disk space and there are no performance demerit.

  • [Online index construction] Added GRN_II_REDUCE_EXPIRE_THRESHOLD environment variable to control when memory maps are expired in index column. It’s -1 by default. It means that expire timing is depends on index column size. If index column is smaller, expire timing is more. If index column is larger, expire timing is less.

    You can use the previous behavior by 0. It means that Groonga always tries to expire.

  • [logical_range_filter] [post_filter] Added a new filter timing. It’s executed after filtered stage generated columns are generated.


  • Reduced resource usage for creating index for reference vector. [GitHub#806][Reported by Naoya Murakami]

  • [table_create] Fixed a bug that a table is created even when token_filters is invalid. [GitHub#266]


  • 付超群

  • Naoya Murakami

Release 7.1.0 - 2017-12-29


  • [load] Improved the load’s query-log format. Added detail below items in the load’s query-log.

    • outputs number of loaded records.

    • outputs number of error records and columns.

    • outputs number of total records.

  • [logical_count] Improved the logical_count’s query-log format. Added detail below items in the logical_count’s query-log.

    • outputs number of count.

  • [logical_select] Improve the logical_select’s query-log format. Added detail below items in the logical_select’s query-log.

    • log N outputs.

    • outputs plain drilldown.

    • outputs labeled drilldown.

    • outputs selected in each shard.

    • use “[…]” for target information.

  • [delete] Improved the delete’s query-log format. Added detail below items in the delete’s query-log.

    • outputs number of deleted and error records.

    • outputs number of rest number of records.

  • [Groonga HTTP server] The server executed by groonga -s ensure stopping by C-c.

  • Used NaN and Infinity, -Infinity instead of Lisp representations(#<nan> and #i1/0, #-i1/0).

  • Supported vector for drilldown calc target.

  • Partially supported keyword extraction from regexp search. It enables highlight_html and snippet_html for regexp search. [GitHub#787][Reported by takagi01]

  • [bulk] Reduced the number of realloc(). grn_bulk_*() API supports it.

    It improves performance for large output case on Windows. For example, it causes 100x faster for 100MB over output.

    Because realloc() is heavy on Windows.

  • Enabled GRN_II_OVERLAP_TOKEN_SKIP_ENABLE only when its value is “yes”.


  • Added new function index_column_source_records. It gets source records of index column.[Patch by Naoya Murakami]

  • [select] Supported negative “offset” for “offset + size - limit” >= 0

  • Added grn_column_cache. It’ll improve performance for getter of fixed size column value.

  • [groonga executable file] Added --listen-backlog option. You can customize listen(2)’s backlog by this option.

  • [httpd] Updated bundled nginx to 1.13.8.


  • Fixed a memory leak in highlight_full

  • Fixed a crash bug by early unlink It’s not caused by instruction in grn_expr_parse() but it’s caused when libgroonga user such as Mroonga uses the following instructions:

    1. grn_expr_append_const("_id")

    2. grn_expr_append_op(GRN_OP_GET_VALUE)


  • takagi01

  • Naoya Murakami

Release 7.0.9 - 2017-11-29


  • Supported newer version of Apache Arrow. In this release, 0.8.0 or later is required for Apache Arrow support.

  • [sharding] Added new API for dynamic columns.

    • Groonga::LabeledArguments

  • [sharding] Added convenient Table#select_all method.

  • [logical_range_filter] Supported dynamic columns. Note that initial and filtered stage are only supported.

  • [logical_range_filter] Added documentation about cache parameter and dynamic columns.

  • [logical_count] Supported dynamic columns. Note that initial stage is only supported.

  • [logical_count] Added documentation about named parameters.

  • [select] Supported --match_columns _key without index.

  • [in_values] Supported to specify more than 126 values. [GitHub#760] [GitHub#781] [groonga-dev,04449] [Reported by Murata Satoshi]

  • [httpd] Updated bundled nginx to 1.13.7.


  • [httpd] Fixed build error when old Groonga is already installed. [GitHub#775] [Reported by myamanishi3]

  • [in_values] Fixed a bug that in_values with too many arguments can cause a crash. This bug is found during supporting more than 126 values. [GitHub#780]

  • [cmake] Fixed LZ4 and MessagePack detection. [Reported by Sergei Golubchik]

  • [Offline index construction] Fixed a bug that offline index construction for vector column consumes unnecessary resources. If you have a log of elements in one vector column and many records, Groonga will crash. [groonga-dev,04533][Reported by Toshio Uchiyama]


  • Murata Satoshi

  • myamanishi3

  • Sergei Golubchik

  • Toshio Uchiyama

Release 7.0.8 - 2017-10-29


  • [windows] Supported backtrace on crash. This feature not only function call history but also source filename and number of lines can be displayed as much as possible. This feature makes problem solving easier.

  • Supported ( ) (empty block) only query (--query "( )") for QUERY_NO_SYNTAX_ERROR. In the previous version, it caused an error. [GitHub#767]

  • Supported (+) (only and block) only query (--query "(+)") for QUERY_NO_SYNTAX_ERROR. In the previous version, it caused an error. [GitHub#767]

  • Supported ~foo (starting with “~”) query (--query "~y") for QUERY_NO_SYNTAX_ERROR. In the previous version, it caused an error. [GitHub#767]

  • Modified log level of expired from info to debug. 2017-10-29 14:05:34.123456|i| <0000000012345678:0> expired i=000000000B123456 max=10 (2/2) This message is logged when memory mapped area for index is unmapped. Thus, this log message is useful information for debugging, in other words, as it is unnecessary information in normal operation, we changed log level from info to debug.

  • Supported Ubuntu 17.10 (Artful Aardvark)


  • [dat] Fixed a bug that large file is created unexpectedly in the worst case during database expansion process. This bug may occurs when you create/delete index columns so frequently. In 7.0.7 release, a related bug was fixed - “table_create command fails when there are many deleted keys”, but it turns out that it is not enough in the worst case.

  • [logical_select] Fixed a bug that when offset and limit were applied to multiple shards at the same time, there is a case that it returns a fewer number of records unexpectedly.

Release 7.0.7 - 2017-09-29


  • Supported + only query (--query "+") for QUERY_NO_SYNTAX_ERROR. In the previous version, it caused an error.

  • [httpd] Updated bundled nginx to 1.13.5.

  • [dump] Added the default argument values to the syntax section.

  • [Command version] Supported --default-command-version 3.

  • Supported caching select result with function call. Now, most of existing functions supports this feature. There are two exception, when now() and rand() are used in query, select result will not cached. Because of this default behavior change, new APIs are introduced.

    • grn_proc_set_is_stable()

    • grn_proc_is_stable()

    Note that if you add a new function that may return different result with the same argument, you must call grn_proc_is_stable(ctx, proc, GRN_FALSE). If you don’t call it, select result with the function call is cached and is wrong result for multiple requests.


  • [windows] Fixed to clean up file handle correctly on failure when database_unmap is executed. There is a case that critical section is not initialized when request is canceled before executing database_unmap. In such a case, it caused a crach bug.

  • [Tokenizers] Fixed document for wrong tokenizer names. It should be TokenBigramIgnoreBlankSplitSymbolAlpha and TokenBigramIgnoreBlankSplitSymbolAlphaDigit.

  • Changed not to keep created empty file on error.

    In the previous versions, there is a case that empty file keeps remain on error.

    Here is the senario to reproduce:

    1. creating new file by grn_fileinfo_open succeeds

    2. mapping file by DO_MAP() is failed

    In such a case, it causes an another error such as “already file exists” because of the file which isn’t under control. so these file should be removed during cleanup process.

  • Fixed a bug that Groonga may be crashed when search process is executed during executing many updates in a short time.

  • [table_create] Fixed a bug that table_create failed when there are many deleted keys.

Release 7.0.6 - 2017-08-29


  • Supported prefix match search using multiple indexes. (e.g. --query "Foo*" --match_columns "TITLE_INDEX_COLUMN||BODY_INDEX_COLUMN").

  • [window_count] Supported window_count function to add count data to result set. It is useful to analyze or filter additionally.

  • Added the following API

    • grn_obj_get_disk_usage():


    • grn_expr_syntax_expand_query_by_table()

    • grn_table_find_reference_object()

  • [object_inspect] Supported to show disk usage about specified object.

  • Supported falling back query parse feature. It is enabled when QUERY_NO_SYNTAX_ERROR flag is set to query_flags. (this feature is disabled by default). If this flag is set, query never causes syntax error. For example, “A +” is parsed and escaped automatically into “A +”. This behavior is useful when application uses user input directly and doesn’t want to show syntax error to user and in log.

  • Supported to adjust score for term in query. “>”, “<”, and “~” operators are supported. For example, “>Groonga” increments score of “Groonga”, “<Groonga” decrements score of “Groonga”. “~Groonga” decreases score of matched document in the current search result. “~” operator doesn’t change search result itself.

  • Improved performance to remove table. thread_limit=1 is not needed for it. The process about checking referenced table existence is done without opening objects. As a result, performance is improved.

  • [httpd] Updated bundled nginx to 1.13.4.


  • [dump] Fixed a bug that the 7-th unnamed parameter for –sort_hash_table option is ignored.

  • [schema] Fixed a typo in command line parameter name. It should be source instead of sources. [groonga-dev,04449] [Reported by murata satoshi]

  • [ruby_eval] Fixed crash when ruby_eval returned syntax error. [GitHub#751] [Patch by ryo-pinus]


  • murata satoshi

  • ryo-pinus

Release 7.0.5 - 2017-07-29


  • [httpd] Updated bundled nginx to 1.13.3. Note that this version contains security fix for CVE-2017-7529.

  • [load] Supported to load the value of max UInt64. In the previous versions, max UInt64 value is converted into 0 unexpectedlly.

  • Added the following API

    • grn_window_get_size() [GitHub#725] [Patch by Naoya Murakami]

  • [math_abs] Supported math_abs() function to calculate absolute value. [GitHub#721]

  • Supported to make grn_default_logger_set_path() and grn_default_query_logger_set_path() thread safe.

  • [windows] Updated bundled pcre library to 8.41.

  • [normalize] Improved not to output redundant empty string "" on error. [GitHub#730]

  • [functions/time] Supported to show error message when division by zero was happened. [GitHub#733] [Patch by Naoya Murakami]

  • [windows] Changed to map ERROR_NO_SYSTEM_RESOURCES to GRN_RESOURCE_TEMPORARILY_UNAVAILABLE. In the previous versions, it returns rc=-1 as a result code. It is not helpful to investigate what actually happened. With this fix, it returns rc=-12.

  • [functions/min][functions/max] Supported vector column. Now you need not to care scalar column or vector column to use. [GitHub#735] [Patch by Naoya Murakami]

  • [dump] Supported --sort_hash_table option to sort by _key for hash table. Specify --sort_hash_table yes to use it.

  • [between] Supported to specify index column. [GitHub#740] [Patch by Naoya Murakami]

  • [load] Supported Apache Arrow 0.5.0 or later.

  • [How to analyze error messages] Added howto article to analyze error message in Groonga.

  • [Debian GNU/Linux] Updated required package list to build from source.

  • [Ubuntu] Dropped Ubuntu 16.10 (Yakkety Yak) support. It has reached EOL at July 20, 2017.


  • Fixed to construct correct fulltext indexes against vector column which type belongs to text family (`ShortText and so on). This fix resolves that fulltext search doesn’t work well against text vector column after updating indexes. [GitHub#494]

  • [thread_limit] Fixed a bug that deadlock occurs when thread_limit?max=1 is requested at once.

  • [groonga-httpd] Fixed a mismatch path of pid file between default one and restart command assumed. This mismatch blocked restarting groonga-httpd. [GitHub#743] [Reported by sozaki]


  • Naoya Murakami

Release 7.0.4 - 2017-06-29


  • Added physical create/delete operation logs to identify problem for troubleshooting. [GitHub#700,#701]

  • [in_records] Improved performance for fixed sized column. It may reduce 50% execution time.

  • [grndb] Added --log-path option. [GitHub#702,#703]

  • [grndb] Added --log-level option. [GitHub#706,#708]

  • Added the following API

    • grn_operator_to_exec_func()

    • grn_obj_is_corrupt()

  • Improved performance for “FIXED_SIZE_COLUMN OP CONSTANT”. Supported operators are: ==, !=, <, >, <= and >=.

  • Improved performance for “COLUMN OP VALUE && COLUMN OP VALUE && …”.

  • [grndb] Supported corrupted object detection with grndb check.

  • [io_flush] Supported --only_opened option which enables to flush only opened database objects.

  • [grndb] Supported to detect/delete orphan “inspect” object. The orphaned “inspect” object is created by renamed command name from inspect to object_inspect.


  • [rpm][centos] Fixed unexpected macro expansion problem with customized build. This bug only affects when rebuilding Groonga SRPM with customized additional_configure_options parameter in spec file.

  • Fixed missing null check for grn_table_setoperation(). There is a possibility of crash bug when indexes are broken. [GitHub#699]


Release 7.0.3 - 2017-05-29


  • [select] Add document about Full text search with specific index name.

  • [index] Supported to log warning message which record causes posting list overflows.

  • [load][dump] Supported Apache Arrow. [GitHub#691]

  • [cmake] Supported linking lz4 in embedded static library build. [Original patch by Sergei Golubchik]

  • [delete] Supported to cancel.

  • [httpd] Updated bundled nginx to 1.13.0

  • Exported the following API

    • grn_plugin_proc_get_caller()

  • Added index column related function and selector.

    • Added new selector: index_column_df_ratio_between()

    • Added new function: index_column_df_ratio()


  • [delete] Fixed a bug that error isn’t cleared correctly. It affects to following deletions so that it causes unexpected behavior.

  • [windows] Fixed a bug that IO version is not detected correctly when the file is opened with O_CREAT flag.

  • [vector_slice] Fixed a bug that non 4 bytes vector columns can’t slice. [GitHub#695] [Patch by Naoya Murakami]

  • Fixed a bug that non 4 bytes fixed vector column can’t sequential match by specifying index of vector. [GitHub#696] [Patch by Naoya Murakami]

  • [logical_select] Fixed a bug that “argument out of range” occurs when setting last day of month to the min. [GitHub#698]


  • Sergei Golubchik

  • Naoya Murakami

Release 7.0.2 - 2017-04-29



  • [logical_select] Fixed a bug that wrong cache is used. This bug was occurred when dynamic column parameter is used.

  • [logical_select] Fixed a bug that dynamic columns aren’t created. It’s occurred when no match case.

  • [reindex] Fixed a bug that data is lost by reindex. [GitHub#646]

  • [httpd] Fixed a bug that response of quit and shutdown is broken JSON when worker is running as another user. [GitHub ranguba/groonga-client#12]

Release 7.0.1 - 2017-03-29


  • Exported the following API

    • grn_ii_cursor_next_pos()

    • grn_table_apply_expr()

    • grn_obj_is_data_column()

    • grn_obj_is_expr()

    • grn_obj_is_scalar_column()

  • [dump] Supported to dump weight reference vector.

  • [load] Supported to load array<object> style weight vector column. The example of array<object> style is: [{"key1": weight1}, {"key2": weight2}].

  • Supported to search !(XXX OPERATOR VALUE) by index. Supported operator is not only > but also >=, <, <=, == and !=.

  • Supported index search for “!(column == CONSTANT)”. The example in this case is: !(column == 29) and so on.

  • Supported more “!” optimization in the following patterns.

    • !(column @ "X") && (column @ "Y")

    • (column @ "Y") && !(column @ "X")

    • (column @ "Y") &! !(column @ "X")

  • Supported to search XXX || !(column @ "xxx") by index.

  • [dump] Changed to use '{"x": 1, "y": 2}' style for not referenced weight vector. This change doesn’t affect to old Groonga because it already supports one.

  • [experimental] Supported GRN_ORDER_BY_ESTIMATED_SIZE_ENABLE environment variable. This variable controls whether query optimization which is based on estimated size is applied or not. This feature is disabled by default. Set GRN_ORDER_BY_ESTIMATED_SIZE_ENABLE=yes if you want to try it.

  • [select] Added query log for columns, drilldown evaluation.

  • [select] Changed query log format for drilldown. This is backward incompatible change, but it only affects users who convert query log by own programs.

  • [table_remove] Reduced temporary memory usage. It’s enabled when the number of max threads is 0.

  • [select] columns[LABEL](N) is used for query log format instead of columns(N)[LABEL]..

  • [Query expansion] Updated example to use vector column because it is recommended way. [Reported by Gurunavi, Inc]

  • Supported to detect canceled request while locking. It fixes the problem that request_cancel is ignored unexpectedly while locking.

  • [logical_select] Supported initial and filtered stage dynamic columns. The examples are: --columns[LABEL].stage initial or --columns[LABEL].stage filtered.

  • [logical_select] Supported match_columns, query and drilldown_filter option.

  • [highlight_html] Supported similar search.

  • [logical_select] Supported initial and stage dynamic columns in labeled drilldown. The example is: --drilldowns[LABEL].stage initial.

  • [logical_select] Supported window function in dynamic column.

  • [select] Added documentation about dynamic columns.

  • [Window function] Added section about window functions.

  • [CentOS] Dropped CentOS 5 support because of EOL.

  • [httpd] Updated bundled nginx to 1.11.12

  • Supported to disable AND match optimization by environment variable. You can disable this feature by GRN_TABLE_SELECT_AND_MIN_SKIP_ENABLE=no. This feature is enable by default.

  • [vector_new] Added a new function to create a new vector.

  • [select] Added documentation about drilldown_filter.


  • [lock_clear] Fixed a crash bug against temporary database.

  • Fixed a problem that dynamically updated index size was increased for natural language since Grooonga 6.1.4.

  • [select] Fixed a bug that “A && B.C @ X” may not return records that should be matched.

  • Fixed a conflict with grn_io_flush() and grn_io_expire(). Without this change, if io_flush and load command are executed simultaneously in specific timing, it causes a crash bug by access violation.

  • [logical_table_remove] Fixed a crash bug when the max number of threads is 1.


  • Gurunavi, Inc.

Release 7.0.0 - 2017-02-09


  • [in_values] Supported sequential search for reference vector column. [Patch by Naoya Murakami] [GitHub#629]

  • [select] Changed to report error instead of ignoring on invalid drilldown[LABEL].sort_keys.

  • [select] Removed needless metadata updates on DB. It reduces the case that database lock remains even though select command is executed. [Reported by aomi-n]

  • [lock_clear] Changed to clear metadata lock by lock_clear against DB.

  • [CentOS] Enabled EPEL by default to install Groonga on Amazon Linux.

  • [query] Supported “@X” style in script syntax for prefix(“@^”), suffix(“@$”), regexp(“@^”) search.

  • [query] Added documentation about available list of mode. The default mode is MATCH (“@”) mode which executes full text search.

  • [rpm][centos] Supported groonga-token-filter-stem package which provides stemming feature by TokenFilterStem token filter on CentOS 7. [GitHub#633] [Reported by Tim Bellefleur]

  • [window_record_number] Marked record_number as deprecated. Use window_record_number instead. record_number is still available for backward compatibility.

  • [window_sum] Added window_sum window function. It’s similar behavior to window function sum() on PostgreSQL.

  • Supported to construct offline indexing with in-memory (temporary) TABLE_DAT_KEY table. [GitHub#623] [Reported by Naoya Murakami]

  • [onigmo] Updated bundled Onigmo to 6.1.1.

  • Supported columns[LABEL].window.group_keys. It’s used to apply window function for every group.

  • [load] Supported to report error on invalid key. It enables you to detect mismatch type of key.

  • [load] Supported --output_errors yes option. If you specify “yes”, you can get errors for each load failed record. Note that this feature requires command version 3.

  • [load] Improve error message on table key cast failure. Instead of “cast failed”, type of table key and target type of table key are also contained in error message.

  • [httpd] Updated bundled nginx to 1.11.9.


  • Fixed a bug that nonexistent sort keys for drilldowns[LABEL] or slices[LABEL] causes invalid JSON parse error. [Patch by Naoya Murakami] [GitHub#627]

  • Fixed a bug that access to nonexistent sub records for group causes a crash. For example, This bug affects the case when you use drilldowns[LABEL].sort_keys _sum without specifying calc_types. [Patch by Naoya Murakami] [GitHub#625]

  • Fixed a crash bug when tokenizer has an error. It’s caused when tokenizer and token filter are registered and tokenizer has an error.

  • [window_record_number] Fixed a bug that arguments for window function is not correctly passed. [GitHub#634][Patch by Naoya Murakami]


  • Naoya Murakami

  • aomi-n

The old releases