Manual talk:Category table

cat_hidden

Ironically, even so named "hidden categories" in Wikipedia (like en:Category:All article disambiguation pages) have not this field set:

+--------+----------------------------------+-----------+-------------+-----------+------------+
| cat_id | cat_title                        | cat_pages | cat_subcats | cat_files | cat_hidden |
+--------+----------------------------------+-----------+-------------+-----------+------------+
| 582412 | All_article_disambiguation_pages |    181129 |           0 |         0 |          0 |
+--------+----------------------------------+-----------+-------------+-----------+------------+

So what was its intended purpose? Incnis Mrsi 10:51, 2 September 2010 (UTC)