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CREATE TABLE /*_*/categorylinks_tmp (
-- Key to page_id of the page defined as a category member.
cl_from int unsigned NOT NULL default 0,
-- Name of the category.
-- This is also the page_title of the category's description page;
-- all such pages are in namespace 14 (NS_CATEGORY).
cl_to varchar(255) binary NOT NULL default '',
-- A binary string obtained by applying a sortkey generation algorithm
-- (Collation::getSortKey()) to page_title, or cl_sortkey_prefix . "\n"
-- . page_title if cl_sortkey_prefix is nonempty.
cl_sortkey varbinary(230) NOT NULL default '',
-- A prefix for the raw sortkey manually specified by the user, either via
-- [[Category:Foo|prefix]] or {{defaultsort:prefix}}. If nonempty, it's
-- concatenated with a line break followed by the page title before the sortkey
-- conversion algorithm is run. We store this so that we can update
-- collations without reparsing all pages.
-- Note: If you change the length of this field, you also need to change
-- code in LinksUpdate.php. See T27254.
cl_sortkey_prefix varchar(255) binary NOT NULL default '',
-- This isn't really used at present. Provided for an optional
-- sorting method by approximate addition time.
cl_timestamp timestamp NOT NULL,
-- Stores $wgCategoryCollation at the time cl_sortkey was generated. This
-- can be used to install new collation versions, tracking which rows are not
-- yet updated. '' means no collation, this is a legacy row that needs to be
-- updated by updateCollation.php. In the future, it might be possible to
-- specify different collations per category.
cl_collation varbinary(32) NOT NULL default '',
-- Stores whether cl_from is a category, file, or other page, so we can
-- paginate the three categories separately. This never has to be updated
-- after the page is created, since none of these page types can be moved to
-- any other.
cl_type ENUM('page', 'subcat', 'file') NOT NULL default 'page',
PRIMARY KEY (cl_from,cl_to)
) /*$wgDBTableOptions*/;
INSERT INTO /*_*/categorylinks_tmp
SELECT *
FROM /*_*/categorylinks;
DROP TABLE /*_*/categorylinks;
ALTER TABLE /*_*/categorylinks_tmp RENAME TO /*_*/categorylinks;
-- We always sort within a given category, and within a given type. FIXME:
-- Formerly this index didn't cover cl_type (since that didn't exist), so old
-- callers won't be using an index: fix this?
CREATE INDEX /*i*/cl_sortkey ON /*_*/categorylinks (cl_to,cl_type,cl_sortkey,cl_from);
-- Used by the API (and some extensions)
CREATE INDEX /*i*/cl_timestamp ON /*_*/categorylinks (cl_to,cl_timestamp);
-- Used when updating collation (e.g. updateCollation.php)
CREATE INDEX /*i*/cl_collation_ext ON /*_*/categorylinks (cl_collation, cl_to, cl_type, cl_from);
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