Kentaro Hayashi
null+****@clear*****
Wed May 10 18:38:12 JST 2017
Kentaro Hayashi 2017-05-10 18:38:12 +0900 (Wed, 10 May 2017) New Revision: 53527cf43c67fd0f2318bb960e404e6ba879a1e3 https://github.com/groonga/groonga/commit/53527cf43c67fd0f2318bb960e404e6ba879a1e3 Message: doc: add more notice Modified files: doc/source/reference/commands/select.rst Modified: doc/source/reference/commands/select.rst (+16 -7) =================================================================== --- doc/source/reference/commands/select.rst 2017-05-10 17:28:02 +0900 (d963da5) +++ doc/source/reference/commands/select.rst 2017-05-10 18:38:12 +0900 (d11a524) @@ -555,18 +555,27 @@ You can also specify index columns to ``--match_columns`` parameter. In such a case, you can control what index column should be used and what data column should be searched explicitly. -There are two kind of index columns which you can specify. +If data column is specified to ``--match_columns``, Groonga searches +related index column automatically, but it is not defined as a spec +that which index column is actually selected. Thus, if multiple index +columns are created against one data column, there is no way to know +which index column will be selected in advance. (In most cases, latest +created index column will be selected, but it is undocumented +behavior.) + +Here is a use case how to specify index column. * index column for one data column * index column for multiple data column If you use index column for one data column, index column which -corresponds to data column is paired. On the otherhand, if you use -index column for multiple data column, all data column is searched by -default. If you want to use specific index column to search specific -data column, Specify index column with data column name such as -`TERMS_TABLE.INDEX_COLUMN.DATA_COLUMN``. See example use case -:ref:`full-text-search-with-specific-index-name` for details. +corresponds to data column is paired. Thus, +``TERMS_TABLE.INDEX_COLUMN`` should be specified. On the otherhand, if +you use index column for multiple data column, all data column is +searched by default. If you want to use specific multiple index column +to search specific data column, Specify index column with data column +name such as ``TERMS_TABLE.INDEX_COLUMN.DATA_COLUMN``. See example use +case :ref:`full-text-search-with-specific-index-name` for details. .. _select-query: -------------- next part -------------- HTML����������������������������...Télécharger
