test.sql

create table demo (
  id int,
  useless int,
  b boolean
) partition by range (id);

alter table demo drop column useless;

-- only seems to cause failure when it's a partial index on b.
create index on demo(b) where b = 't';

create table demo_1_20191031 partition of demo for values from (1) to (2);

-- psql:test.sql:13: ERROR:  unexpected varattno 3 in expression to be mapped
-- Time: 2.619 ms