feat(db): add index and function to check group3_inpn (#433)

* feat(db): add vm and function to check group3_inpn

* refactor(db): replace vm by index in taxref

Updated sql function not to use vm but to select in taxref instead

apptax/migrations/versions/33e20a7682b4_check_group3_inpn_vm_function.py

@@ -0,0 +1,49 @@
+"""check_group3_inpn_vm_and_function
+
+Revision ID: 33e20a7682b4
+Revises: 32c5ed42bdbd
+Create Date: 2023-09-04 08:23:34.336383
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = "33e20a7682b4"
+down_revision = "32c5ed42bdbd"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.execute(
+        """
+            CREATE INDEX i_taxref_group3_inpn ON taxonomie.taxref USING btree (group3_inpn);
+        """
+    )
+
+    op.execute(
+        """
+                CREATE OR REPLACE FUNCTION taxonomie.check_is_group3inpn(mygroup text)
+                RETURNS boolean
+                LANGUAGE plpgsql
+                IMMUTABLE
+                AS $function$
+                --fonction permettant de vérifier si un texte proposé correspond à un group3_inpn dans la table taxref
+                BEGIN
+                    IF EXISTS (SELECT 1 FROM taxonomie.taxref WHERE group3_inpn = mygroup ) OR mygroup IS NULL THEN
+                    RETURN true;
+                    ELSE
+                    RETURN false;
+                    END IF;
+                END;
+                $function$;
+
+"""
+    )
+
+
+def downgrade():
+    op.execute("DROP INDEX taxonomie.i_taxref_group3_inpn")
+    op.execute("DROP FUNCTION taxonomie.check_is_group3inpn")