BloGroonga

2022-08-29

Groonga 12.0.7 has been released

Groonga 12.0.7 has been released!

How to install: Install

Changes

Here are important changes in this release:

Improvements

  • Added a new function escalate(). (experimental)

    The escalate() function is similar to the existing match escalation ( Search ). We can use this function for any conditions. (The existing match escalation is just for one full text search by invert index.)

    The escalate() function is useful when we want to limit the number of results of a search. Even if we use --limit, we can limit the number of results of a search. However, --limit is evaluated after evaluating all conditions in our query. The escalate() function finish the evaluation of conditions at that point when the result set has greater than THRESHOLD records. In other words, The escalate() function may reduce the number of evaluating conditions.

    The syntax of the escalate() function as below::

      escalate(THRESHOLD_1, CONDITION_1,
           THRESHOLD_2, CONDITION_2,
           ...,
           THRESHOLD_N, CONDITION_N)

    THRESHOLD_N is a positive number such as 0 and 29. CONDITION_N is a string that uses script_syntax such as number_column > 29.

    If the current result set has less than or equal to THRESHOLD_1 records, the corresponding CONDITION_1 is executed. Similarly, if the next result set has less than or equal to THRESHOLD_2 records, the corresponding CONDITION_2 is executed. If the next result set has greater than THRESHOLD_3 records, the escalate() function is finished.

    If all CONDITION s are executed, escalate(THRESHOLD_1, CONDITION_1, ..., THRESHOLD_N, CONDITION_N) is same as CONDITION_1 || ... || CONDITION_N.

    The escalate() function can be worked with logical operators such as && and &! ::

      number_column > 10 && escalate(THRESHOLD_1, CONDITION_1,
                                 ...,
                                 THRESHOLD_N, CONDITION_N)
  number_column > 10 &! escalate(THRESHOLD_1, CONDITION_1,
                                 ...,
                                 THRESHOLD_N, CONDITION_N)

    They are same as number_column > 10 && (CONDITION_1 || ... || CONDITION_N) and number_column > 10 &! (CONDITION_1 || ... || CONDITION_N) .

    However, these behaviors may be changed because they may not be useful.

  • [httpd] Updated bundled nginx to 1.23.1.

  • select Add a document for the --n_workers option.

Fixes

  • Fixed a bug Groonga's response may be slow when we execute the request_cancel while executing a OR search.

    When the number of results of the OR search is many and a query has many OR conditions, Groonga may response slow with the "request_cancel" command.

Known Issues

  • Currently, Groonga has a bug that there is possible that data is corrupt when we execute many additions, delete, and update data to vector column.

  • *< and *> only valid when we use query() the right side of filter condition. If we specify as below, *< and *> work as &&.

    • 'content @ "Groonga" *< content @ "Mroonga"'

  • Groonga may not return records that should match caused by GRN_II_CURSOR_SET_MIN_ENABLE.

Conclusion

Please refert to the following news for more details.

News Release 12.0.7

Let's search by Groonga!