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create or replace function plproxy.get_cluster_version(cluster_name text)
returns integer as $$
begin
if cluster_name = 'testcluster' then
return 6;
end if;
raise exception 'no such cluster: %', cluster_name;
end; $$ language plpgsql;
create or replace function plproxy.get_cluster_partitions(cluster_name text)
returns setof text as $$
begin
if cluster_name = 'testcluster' then
return next 'host=127.0.0.1 dbname=test_part0';
return next 'host=127.0.0.1 dbname=test_part1';
return next 'host=127.0.0.1 dbname=test_part2';
return next 'host=127.0.0.1 dbname=test_part3';
return;
end if;
raise exception 'no such cluster: %', cluster_name;
end; $$ language plpgsql;
\c test_part0
create function test_multi(part integer, username text)
returns integer as $$ begin return 0; end; $$ language plpgsql;
\c test_part1
create function test_multi(part integer, username text)
returns integer as $$ begin return 1; end; $$ language plpgsql;
\c test_part2
create function test_multi(part integer, username text)
returns integer as $$ begin return 2; end; $$ language plpgsql;
\c test_part3
create function test_multi(part integer, username text)
returns integer as $$ begin return 3; end; $$ language plpgsql;
\c regression
create function test_multi(part integer, username text)
returns integer as $$ cluster 'testcluster'; run on int4(part); $$ language plproxy;
select test_multi(0, 'foo');
test_multi
------------
0
(1 row)
select test_multi(1, 'foo');
test_multi
------------
1
(1 row)
select test_multi(2, 'foo');
test_multi
------------
2
(1 row)
select test_multi(3, 'foo');
test_multi
------------
3
(1 row)
-- test RUN ON ALL
drop function test_multi(integer, text);
create function test_multi(part integer, username text)
returns setof integer as $$ cluster 'testcluster'; run on all; $$ language plproxy;
select test_multi(0, 'foo') order by 1;
test_multi
------------
0
1
2
3
(4 rows)
-- test RUN ON 2
drop function test_multi(integer, text);
create function test_multi(part integer, username text)
returns setof integer as $$ cluster 'testcluster'; run on 2; $$ language plproxy;
select test_multi(0, 'foo');
test_multi
------------
2
(1 row)
-- test RUN ON RANDOM
select setseed(0.5);
setseed
---------
(1 row)
drop function test_multi(integer, text);
create function test_multi(part integer, username text)
returns setof integer as $$ cluster 'testcluster'; run on any; $$ language plproxy;
-- expect that 20 calls use all partitions
select distinct test_multi(0, 'foo') from generate_series(1,20) order by 1;
test_multi
------------
0
1
2
3
(4 rows)
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