This was a regression introduced by 7deeabc7c7526786df6894429ce89a9c4b614086
to address CVE-2019-14234.
Thanks Tim Kleinschmidt for the report and Mariusz for the tests.
Backport of 6c3dfba89215fc56fc27ef61829a6fff88be4abb from master
SQLite doesn't repoint table aliases in partial index conditions on table
rename which breaks the documented table alteration procedure.
Thanks Pēteris Caune for the report.
Backport of 34decdebf157b6f05836009cc1967f74ee541fdf from master