create extension btree_gist;
alter table pgbench_branches drop constraint pgbench_branches_pkey;
alter table pgbench_tellers drop constraint pgbench_tellers_pkey;
alter table pgbench_accounts drop constraint pgbench_accounts_pkey;
create index pgbench_branches_bid on pgbench_branches using gist (bid);
create index pgbench_tellers_tid on pgbench_tellers using gist (tid);
create index pgbench_accounts_aid on pgbench_accounts using gist (aid);
