Thanks Ariel.

So the revisions are in order of revision id which are assigned sequentially, which means that the revisions are in chronological order. Are there situations, however, where the parent id gives a history that isn’t chronological? That is, is there a continuous chain of edits from the creation of a page to its current version, or can there be forks in the history? I’m not too familiar with how reverts work, but maybe by reverting to a previous version of a page you can end up with a revision whose parent is not just the previous revision chronologically.

Thanks,

Christopher

On Jan 17, 2020, at 6:07 AM, Ariel Glenn WMF <ariel@wikimedia.org> wrote:

The queries to get page and revision metadata are ordered by page id, and within each page, by revision id. This is guaranteed.

The behavior of rev_parent_id is not guaranteed however, in certain edge cases. See e.g. https://phabricator.wikimedia.org/T193211

Anyone who uses this field care to weigh in?

Ariel

On Fri, Jan 17, 2020 at 10:52 AM Christopher Wolfram <chriscwolfram@gmail.com> wrote:

Hi,

Perhaps there is documentation about this, but I have looked for the past hour and haven’t found anything.

I was wondering if it is guaranteed that all revisions given in the enwiki-latest-pages-meta-history files are in order of parent->child->grandchild->… In a few examples, it looks like they follow this pattern. I ask because I need them in order and it would be nice if I didn’t have to do that with the <parentid> field.

Thank you,
Christopher



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