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feat(taxref): add taxref_tree materialized view
The MV containes for each cd_nom, the list of all parents cd_ref.
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"""create vm_taxref_tree | ||
Revision ID: 83d7105edb76 | ||
Revises: 44447746cacc | ||
Create Date: 2024-10-05 17:40:11.302423 | ||
""" | ||
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from alembic import op | ||
import sqlalchemy as sa | ||
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# revision identifiers, used by Alembic. | ||
revision = "83d7105edb76" | ||
down_revision = "6a20cd1055ec" | ||
branch_labels = None | ||
depends_on = None | ||
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def upgrade(): | ||
op.execute("CREATE EXTENSION IF NOT EXISTS ltree") | ||
op.execute( | ||
""" | ||
CREATE MATERIALIZED VIEW taxonomie.vm_taxref_tree AS | ||
WITH RECURSIVE childs AS ( | ||
SELECT | ||
t.cd_nom, | ||
t.cd_ref::TEXT::ltree AS path, | ||
1 AS path_length, | ||
t_ref.cd_sup AS cd_sup | ||
FROM | ||
taxonomie.taxref t | ||
JOIN taxonomie.taxref t_ref ON | ||
t.cd_ref = t_ref.cd_nom | ||
UNION ALL | ||
SELECT | ||
child.cd_nom AS cd_nom, | ||
parent.cd_ref::TEXT || child.path AS path, | ||
child.path_length + 1 AS path_length, | ||
parent_ref.cd_sup AS cd_sup | ||
FROM | ||
childs child | ||
JOIN taxonomie.taxref parent ON | ||
child.cd_sup = parent.cd_nom | ||
JOIN taxonomie.taxref parent_ref ON | ||
parent.cd_ref = parent_ref.cd_nom | ||
) | ||
SELECT | ||
DISTINCT ON | ||
(cd_nom) cd_nom, | ||
path | ||
FROM | ||
childs | ||
ORDER BY | ||
cd_nom, | ||
path_length DESC | ||
WITH DATA; | ||
""" | ||
) | ||
op.create_index( | ||
index_name="taxref_tree_cd_nom_idx", | ||
schema="taxonomie", | ||
table_name="vm_taxref_tree", | ||
columns=["cd_nom"], | ||
unique=True, | ||
) | ||
# required for these operators: <, <=, =, >=, >, @>, <@, @, ~, ? | ||
op.create_index( | ||
index_name="taxref_tree_path_idx", | ||
schema="taxonomie", | ||
table_name="vm_taxref_tree", | ||
columns=["path"], | ||
postgresql_using="gist", | ||
) | ||
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def downgrade(): | ||
op.execute("DROP MATERIALIZED VIEW taxonomie.vm_taxref_tree") |
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