Topic on Help talk:CirrusSearch

I originally wrote the following here at the English Wikipedia, but thought I should report this here, too:

The deepcat example (deepcat:"musicals") seems to be off. For some reason, if the category's first letter is not capitalized, the search doesn't seem to search in the subcategories. First see en:Category:Musicals and then compare these searches: deepcat:"musicals" vs. deepcat:"Musicals". The latter search also gives the following warning: "A warning has occurred while searching: Deep category query returned too many categories". Maybe we should change the example search and category to a smaller category with correct capitalization, for example to deepcat:"Musicals by topic"?

I would regard different behaviour on musical and Musical as a bug.

The category name is to be normalized; that does mean: It is to be brought into the identical format which is expected by a database query:

• First letter capitalized.
• All _ to be turned into spaces.
• Some additional types of spaces (and tab) turned into standard spaces, and some invisible codes deleting.
• Multiple spaces turned into single spaces, trimming both sides.

Reported as phab:T228633