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create mv taxref_tree #269

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create mv taxref_tree #269

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3e48f2d
create mv taxref_tree
jbdesbas Jun 21, 2021
4b7a18b
cd_nom -> cd_ref
jbdesbas Jun 23, 2021
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25 changes: 25 additions & 0 deletions data/taxref_tree.sql
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--Construction de la VM

CREATE EXTENSION IF NOT EXISTS ltree;

CREATE MATERIALIZED VIEW taxonomie.taxref_tree
AS WITH RECURSIVE x AS (
SELECT t.cd_nom as cd_ref,
t.cd_nom::text::ltree AS path
FROM taxonomie.taxref t
WHERE t.cd_sup IS NULL AND t.cd_nom = t.cd_ref
UNION ALL
SELECT y.cd_nom AS cd_ref,
ltree_addtext(x_1.path, y.cd_nom::text) AS path
FROM x x_1,
taxonomie.taxref y
WHERE y.cd_nom = y.cd_ref AND x_1.cd_ref = y.cd_sup
)
SELECT x.cd_ref,
x.path
FROM x
WITH DATA;

-- View indexes:
CREATE UNIQUE INDEX taxref_tree_cd_nom_idx ON taxonomie.taxref_tree USING btree (cd_ref);
CREATE INDEX taxref_tree_path_idx ON taxonomie.taxref_tree USING gist (path); -- TRES important pour les perfs