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create or replace function plproxy.get_cluster_version(cluster_name text)
returns integer as $$
begin
if cluster_name = 'testcluster' then
return 6;
elsif cluster_name = 'map0' then
return 1;
elsif cluster_name = 'map1' then
return 1;
elsif cluster_name = 'map2' then
return 1;
elsif cluster_name = 'map3' then
return 1;
end if;
raise exception 'no such cluster: %', cluster_name;
end; $$ language plpgsql;
create or replace function plproxy.get_cluster_partitions(cluster_name text)
returns setof text as $$
begin
if cluster_name = 'testcluster' then
return next 'host=127.0.0.1 dbname=test_part0';
return next 'host=127.0.0.1 dbname=test_part1';
return next 'host=127.0.0.1 dbname=test_part2';
return next 'host=127.0.0.1 dbname=test_part3';
elsif cluster_name = 'map0' then
return next 'host=127.0.0.1 dbname=test_part0';
elsif cluster_name = 'map1' then
return next 'host=127.0.0.1 dbname=test_part1';
elsif cluster_name = 'map2' then
return next 'host=127.0.0.1 dbname=test_part2';
elsif cluster_name = 'map3' then
return next 'host=127.0.0.1 dbname=test_part3';
else
raise exception 'no such cluster: %', cluster_name;
end if;
return;
end; $$ language plpgsql;
create function map_cluster(part integer) returns text as $$
begin
return 'map' || part;
end;
$$ language plpgsql;
create function test_clustermap(part integer) returns setof text as $$
cluster map_cluster(part);
run on 0;
select current_database();
$$ language plproxy;
select * from test_clustermap(0);
test_clustermap
-----------------
test_part0
(1 row)
select * from test_clustermap(1);
test_clustermap
-----------------
test_part1
(1 row)
select * from test_clustermap(2);
test_clustermap
-----------------
test_part2
(1 row)
select * from test_clustermap(3);
test_clustermap
-----------------
test_part3
(1 row)
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