Improved view performance

-- View that maps node_id to os_path (relative path of file on disk)

CREATE VIEW node_os_path AS

SELECT node_id, '/' AS os_path FROM node WHERE path = ''

UNION

SELECT node_id, '/' || string_agg(name, '/') AS os_path

FROM (

    SELECT (CASE WHEN os_name IS NOT NULL THEN os_name ELSE name END) AS name, p.node_id

SELECT n.node_id, '/' || STRING_AGG(j.name, '/' ORDER BY t.ord) AS os_path

FROM node n

    JOIN (

        SELECT UNNEST(string_to_array(relative_path::varchar, '.')) AS rel_id, node_id

        FROM node

    ) AS p ON n.node_id::varchar = p.rel_id

    ORDER BY p.node_id, nlevel(n.path)

) AS j GROUP BY node_id;

JOIN REGEXP_SPLIT_TO_TABLE((CASE WHEN relative_path = '' THEN '1' ELSE '1.' || path::text END), '[.]') WITH ORDINALITY t(node_id, ord) ON true

JOIN node j ON j.node_id = t.node_id::int

WHERE j.relative_path IS NOT NULL AND j.relative_path <> ''

GROUP BY n.node_id;

-- View that maps node_id to vos_path (path in VOSpace)

CREATE VIEW node_vos_path AS

SELECT node_id, '/' AS vos_path FROM node WHERE path = ''

UNION

SELECT node_id, '/' || string_agg(name, '/') AS os_path

FROM (

    SELECT name, p.node_id

SELECT n.node_id, COALESCE(NULLIF(STRING_AGG(j.name, '/' ORDER BY t.ord), ''), '/') AS vos_path

FROM node n

    JOIN (

        SELECT UNNEST(string_to_array(path::varchar, '.')) AS rel_id, node_id

        FROM node

    ) AS p ON n.node_id::varchar = p.rel_id

    ORDER BY p.node_id, nlevel(n.path)

) AS j GROUP BY node_id;

JOIN REGEXP_SPLIT_TO_TABLE((CASE WHEN path = '' THEN '1' ELSE '1.' || path::text END), '[.]') WITH ORDINALITY t(node_id, ord) ON true

JOIN node j ON j.node_id = t.node_id::int

GROUP BY n.node_id;

-- View that combines the two previous views to obtain the os_path from the vos_path and vice versa