tree 0202c220e535ca3261b636ff9d1f7bde16bbf14b
parent 2c9edca37a6bfc57df76fff5f5ec692165429246
author Luca Milanesio <luca.milanesio@gmail.com> 1633131076 +0100
committer Luca Milanesio <luca.milanesio@gmail.com> 1634240119 +0100

Avoid looking up refs for all filtered changes

When filtering a huge list of refs all the closed
changes need to be identified and hidden; however, the mere
lookup of the changes' SHA1s from the repository's ref-database
can cause a considerable system load because of the high
number of change refs.

The initial list of refs to be filtered contains already
all the '/meta' refs and their associated SHA1s hence it can
be reused for looking up the change-id to their latest version
instead of re-reading the same information from the repository
on disk.

Depends-On: https://gerrit-review.googlesource.com/c/gerrit/+/319756
Change-Id: I164addd6abc7c1dff1cfeedcec27415e6b88f3b3