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Postgresql dependency query speedup #1192

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Dec 21, 2018
Merged

Postgresql dependency query speedup #1192

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29 changes: 19 additions & 10 deletions dbt/include/global_project/macros/relations/postgres_relations.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@
-- in pg_depend, objid is the dependent, refobjid is the referenced object
-- "a pg_depend entry indicates that the referenced object cannot be dropped without also dropping the dependent object."
-- #}
with relation as (
with relation as (
select
pg_rewrite.ev_class as class,
pg_rewrite.oid as id
Expand All @@ -31,21 +31,29 @@
from pg_namespace
where nspname != 'information_schema' and nspname not like 'pg_%'
),
referenced as (
select
relation.id AS id,
referenced_class.name ,
referenced_class.schema ,
referenced_class.kind
from relation
join class as referenced_class on relation.class=referenced_class.id
where referenced_class.kind in ('r', 'v')
),
relationships as (
select
referenced_class.name as referenced_name,
referenced_class.schema as referenced_schema_id,
referenced.name as referenced_name,
referenced.schema as referenced_schema_id,
dependent_class.name as dependent_name,
dependent_class.schema as dependent_schema_id,
referenced_class.kind as kind
from relation
join class as referenced_class on relation.class=referenced_class.id
join dependency on relation.id=dependency.id
referenced.kind as kind
from referenced
join dependency on referenced.id=dependency.id
join class as dependent_class on dependency.ref=dependent_class.id
where
referenced_class.kind in ('r', 'v') and
(referenced_class.name != dependent_class.name or
referenced_class.schema != dependent_class.schema)
(referenced.name != dependent_class.name or
referenced.schema != dependent_class.schema)
)

select
Expand All @@ -58,6 +66,7 @@
join schema as referenced_schema on relationships.referenced_schema_id=referenced_schema.id
group by referenced_schema, referenced_name, dependent_schema, dependent_name
order by referenced_schema, referenced_name, dependent_schema, dependent_name;

{%- endcall -%}

{{ return(load_result('relations').table) }}
Expand Down