Pavel Stehule <pavel.stehule@gmail.com> writes:
> I tried to write a query that does lateral join between
> information_schema.tables and pgstattuple function.
> select * from information_schema.tables, lateral(select * from
> pgstattuple(table_name::name)) s where table_type = 'BASE TABLE';
> The query finished by strange error
> postgres=# select * from information_schema.tables, lateral(select * from
> pgstattuple(table_name::name)) s where table_type = 'BASE TABLE';
> ERROR: relation "sql_features" does not exist
> When I set search_path to information_schema, then the query is running.
> But there is not any reason why it should be necessary.
Nope, this is classic user error, nothing else. "table_name::name"
is entirely inadequate as a way to reference a table that isn't
visible in your search path. You have to incorporate the schema
name as well.
Ideally you'd just pass the table OID to the OID-accepting version of
pgstattuple(), but of course the information_schema schema views
don't expose OIDs. So basically you need something like
pgstattuple((quote_ident(table_schema)||'.'||quote_ident(table_name))::regclass)
although perhaps format() could help a little here.
regards, tom lane
