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.. -*- rst -*-
.. groonga-command
.. database: vector_size
``vector_size``
===============
Summary
-------
.. versionadded:: 5.0.3
``vector_size`` returns the value of vector column size.
To enable this function, register ``functions/vector`` plugin by
the following command::
plugin_register functions/vector
Syntax
------
``vector_size`` requires one argument - ``target``.
::
vector_size(target)
Usage
-----
Here is a schema definition and sample data.
Sample schema:
.. groonga-command
.. plugin_register functions/vector
.. include:: ../../example/reference/functions/vector_size/usage_setup_schema.log
.. table_create Memos TABLE_HASH_KEY ShortText
.. column_create Memos tags COLUMN_VECTOR ShortText
Sample data:
.. groonga-command
.. include:: ../../example/reference/functions/vector_size/usage_setup_data.log
.. load --table Memos
.. [
.. {"_key": "Groonga", "tags": ["Groonga"]},
.. {"_key": "Rroonga", "tags": ["Groonga", "Ruby"]},
.. {"_key": "Nothing"}
.. ]
Here is the simple usage of ``vector_size`` function which returns tags and size - the value of ``tags`` column and size of it.
.. groonga-command
.. include:: ../../example/reference/functions/vector_size/usage_only.log
.. select Memos --output_columns 'tags, vector_size(tags)'
Parameters
----------
There is only one required parameter.
``target``
^^^^^^^^^^
Specifies a vector column of table that is specified by ``table`` parameter in ``select``.
Return value
------------
``vector_size`` returns the value of target vector column size.
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