CREATE OR REPLACE VIEW mat_view_dependencies AS

WITH RECURSIVE s(start_schemaname,start_relname,start_relkind,

         schemaname,relname,relkind,reloid,owneroid,ownername,depth)

         AS (

-- List of tables and views that mat views depend on

SELECT n.nspname AS start_schemaname, c.relname AS start_relname,

c.relkind AS start_relkind,

n2.nspname AS schemaname, c2.relname, c2.relkind,

c2.oid AS reloid,

au.oid AS owneroid,

au.rolname AS ownername,

0 AS depth

FROM pg_class c JOIN pg_namespace n

     ON c.relnamespace=n.oid AND c.relkind IN ('r','m','v','t','f', 'p')

JOIN pg_depend d ON c.oid=d.refobjid

JOIN pg_rewrite r ON d.objid=r.oid

JOIN pg_class c2 ON r.ev_class=c2.oid -- AND c2.relkind='m'

JOIN pg_namespace n2 ON n2.oid=c2.relnamespace

JOIN pg_authid au ON au.oid=c2.relowner

​

UNION

​

-- Recursively find all mat views depending on previous level

SELECT s.start_schemaname, s.start_relname, s.start_relkind,

n.nspname AS schemaname, c2.relname,

c2.relkind, c2.oid,

au.oid AS owneroid, au.rolname AS ownername,

s.depth+1 AS depth

FROM s

JOIN pg_depend d ON s.reloid=d.refobjid

JOIN pg_rewrite r ON d.objid=r.oid

JOIN pg_class c2 ON r.ev_class=c2.oid AND (c2.relkind IN ('m','v'))

JOIN pg_namespace n ON n.oid=c2.relnamespace

JOIN pg_authid au ON au.oid=c2.relowner

​

WHERE s.reloid <> c2.oid -- exclude the current MV which always depends on itself

)

SELECT * FROM s;

​

--------------------------------------------------

--- A view that returns the list of mat views in the

--- order they should be refreshed.

--------------------------------------------------

CREATE OR REPLACE VIEW mat_view_refresh_order AS

WITH b AS (

-- Select the highest depth of each mat view name

SELECT DISTINCT ON (schemaname,relname) schemaname, relname, ownername, depth

FROM mat_view_dependencies

WHERE relkind='m'

ORDER BY schemaname, relname, depth DESC

)

-- Reorder appropriately

SELECT schemaname, relname, ownername, depth AS refresh_order

FROM b

ORDER BY depth, schemaname, relname

;