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Add relkind checks to certain contrib modules

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The contrib extensions pageinspect, pg_visibility and pgstattuple only
work against regular relations which have storage.  They don't work
against foreign tables, partitioned (parent) tables, views, et al.

Add checks to the user-callable functions to return a useful error
message to the user if they mistakenly pass an invalid relation to a
function which doesn't accept that kind of relation.

In passing, improve some of the existing checks to use ereport() instead
of elog(), add a function to consolidate common checks where
appropriate, and add some regression tests.

Author: Amit Langote, with various changes by me
Reviewed by: Michael Paquier and Corey Huinker
Discussion: https://postgr.es/m/ab91fd9d-4751-ee77-c87b-4dd704c1e59c@lab.ntt.co.jp
This commit is contained in:
Stephen Frost
2017-03-09 16:34:25 -05:00
parent b54aad8e34
commit c08d82f38e
12 changed files with 517 additions and 21 deletions
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107
contrib/pgstattuple/expected/pgstattuple.out
View File

@ -138,3 +138,110 @@ select * from pgstathashindex('test_hashidx');
2 | 4 | 0 | 1 | 0 | 0 | 0 | 100
(1 row)
-- these should error with the wrong type
select pgstatginindex('test_pkey');
ERROR: relation "test_pkey" is not a GIN index
select pgstathashindex('test_pkey');
ERROR: relation "test_pkey" is not a HASH index
select pgstatindex('test_ginidx');
ERROR: relation "test_ginidx" is not a btree index
select pgstathashindex('test_ginidx');
ERROR: relation "test_ginidx" is not a HASH index
select pgstatindex('test_hashidx');
ERROR: relation "test_hashidx" is not a btree index
select pgstatginindex('test_hashidx');
ERROR: relation "test_hashidx" is not a GIN index
-- check that using any of these functions with unsupported relations will fail
create table test_partitioned (a int) partition by range (a);
-- these should all fail
select pgstattuple('test_partitioned');
ERROR: "test_partitioned" (partitioned table) is not supported
select pgstattuple_approx('test_partitioned');
ERROR: "test_partitioned" is not a table or materialized view
select pg_relpages('test_partitioned');
ERROR: "test_partitioned" is not a table, index, materialized view, sequence, or TOAST table
select pgstatindex('test_partitioned');
ERROR: relation "test_partitioned" is not a btree index
select pgstatginindex('test_partitioned');
ERROR: relation "test_partitioned" is not a GIN index
select pgstathashindex('test_partitioned');
ERROR: "test_partitioned" is not an index
create view test_view as select 1;
-- these should all fail
select pgstattuple('test_view');
ERROR: "test_view" (view) is not supported
select pgstattuple_approx('test_view');
ERROR: "test_view" is not a table or materialized view
select pg_relpages('test_view');
ERROR: "test_view" is not a table, index, materialized view, sequence, or TOAST table
select pgstatindex('test_view');
ERROR: relation "test_view" is not a btree index
select pgstatginindex('test_view');
ERROR: relation "test_view" is not a GIN index
select pgstathashindex('test_view');
ERROR: "test_view" is not an index
create foreign data wrapper dummy;
create server dummy_server foreign data wrapper dummy;
create foreign table test_foreign_table () server dummy_server;
-- these should all fail
select pgstattuple('test_foreign_table');
ERROR: "test_foreign_table" (foreign table) is not supported
select pgstattuple_approx('test_foreign_table');
ERROR: "test_foreign_table" is not a table or materialized view
select pg_relpages('test_foreign_table');
ERROR: "test_foreign_table" is not a table, index, materialized view, sequence, or TOAST table
select pgstatindex('test_foreign_table');
ERROR: relation "test_foreign_table" is not a btree index
select pgstatginindex('test_foreign_table');
ERROR: relation "test_foreign_table" is not a GIN index
select pgstathashindex('test_foreign_table');
ERROR: "test_foreign_table" is not an index
-- a partition of a partitioned table should work though
create table test_partition partition of test_partitioned for values from (1) to (100);
select pgstattuple('test_partition');
pgstattuple
---------------------
(0,0,0,0,0,0,0,0,0)
(1 row)
select pgstattuple_approx('test_partition');
pgstattuple_approx
-----------------------
(0,0,0,0,0,0,0,0,0,0)
(1 row)
select pg_relpages('test_partition');
pg_relpages
-------------
0
(1 row)
-- not for the index calls though, of course
select pgstatindex('test_partition');
ERROR: relation "test_partition" is not a btree index
select pgstatginindex('test_partition');
ERROR: relation "test_partition" is not a GIN index
select pgstathashindex('test_partition');
ERROR: "test_partition" is not an index
-- an actual index of a partitiond table should work though
create index test_partition_idx on test_partition(a);
create index test_partition_hash_idx on test_partition using hash (a);
WARNING: hash indexes are not WAL-logged and their use is discouraged
-- these should work
select pgstatindex('test_partition_idx');
pgstatindex
------------------------------
(2,0,8192,0,0,0,0,0,NaN,NaN)
(1 row)
select pgstathashindex('test_partition_hash_idx');
pgstathashindex
---------------------
(2,8,0,1,0,0,0,100)
(1 row)
drop table test_partitioned;
drop view test_view;
drop foreign table test_foreign_table;
drop server dummy_server;
drop foreign data wrapper dummy;