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create or replace function londiste.upgrade_schema()
returns int4 as $$
-- updates table structure if necessary
declare
pgversion int;
cnt int4 = 0;
begin
show server_version_num into pgversion;
-- table_info: check (dropped_ddl is null or merge_state in ('in-copy', 'catching-up'))
perform 1 from information_schema.check_constraints
where constraint_schema = 'londiste'
and constraint_name = 'table_info_check'
and position('in-copy' in check_clause) > 0
and position('catching' in check_clause) = 0;
if found then
alter table londiste.table_info drop constraint table_info_check;
alter table londiste.table_info add constraint table_info_check
check (dropped_ddl is null or merge_state in ('in-copy', 'catching-up'));
cnt := cnt + 1;
end if;
-- table_info.dest_table
perform 1 from information_schema.columns
where table_schema = 'londiste'
and table_name = 'table_info'
and column_name = 'dest_table';
if not found then
alter table londiste.table_info add column dest_table text;
end if;
-- table_info: change trigger timing
if pgversion >= 90100 then
perform 1 from information_schema.triggers
where event_object_schema = 'londiste'
and event_object_table = 'table_info'
and trigger_name = 'table_info_trigger_sync'
and action_timing = 'AFTER';
else
perform 1 from information_schema.triggers
where event_object_schema = 'londiste'
and event_object_table = 'table_info'
and trigger_name = 'table_info_trigger_sync'
and condition_timing = 'AFTER';
end if;
if found then
drop trigger table_info_trigger_sync on londiste.table_info;
create trigger table_info_trigger_sync before delete on londiste.table_info
for each row execute procedure londiste.table_info_trigger();
end if;
-- applied_execute.dest_table
perform 1 from information_schema.columns
where table_schema = 'londiste'
and table_name = 'applied_execute'
and column_name = 'execute_attrs';
if not found then
alter table londiste.applied_execute add column execute_attrs text;
end if;
-- applied_execute: drop queue_name from primary key
perform 1 from pg_catalog.pg_indexes
where schemaname = 'londiste'
and tablename = 'applied_execute'
and indexname = 'applied_execute_pkey'
and indexdef like '%queue_name%';
if found then
alter table londiste.applied_execute
drop constraint applied_execute_pkey;
alter table londiste.applied_execute
add constraint applied_execute_pkey
primary key (execute_file);
end if;
-- applied_execute: drop fkey to pgq_node
perform 1 from information_schema.table_constraints
where constraint_schema = 'londiste'
and table_schema = 'londiste'
and table_name = 'applied_execute'
and constraint_type = 'FOREIGN KEY'
and constraint_name = 'applied_execute_queue_name_fkey';
if found then
alter table londiste.applied_execute
drop constraint applied_execute_queue_name_fkey;
end if;
-- create roles
perform 1 from pg_catalog.pg_roles where rolname = 'londiste_writer';
if not found then
create role londiste_writer in role pgq_admin;
cnt := cnt + 1;
end if;
perform 1 from pg_catalog.pg_roles where rolname = 'londiste_reader';
if not found then
create role londiste_reader in role pgq_reader;
cnt := cnt + 1;
end if;
return cnt;
end;
$$ language plpgsql;
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