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simplify name matching between boundary and place node

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Instead of normalising the names simply compare them in lower
case. This removes the dependency on the tokenizer for
linking boundaries and nodes. When looking up the linked places
by place type also allow that one name is simply contained in the
other. This catches the frequent case where one of the names has
an addendum (e.g. Newport vs. City of Newport).

Drops the special index for the name lookup and insted relies
on a slightly extended version of the geometry index used for
reverse lookup. Saves around 100MB on a planet.
This commit is contained in:
Sarah Hoffmann
2021-04-09 21:10:00 +02:00
parent dc02610408
commit e7266b52ae
3 changed files with 14 additions and 13 deletions
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16
lib-sql/functions/placex_triggers.sql
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@@ -169,7 +169,7 @@ BEGIN
END IF;
IF bnd.name ? 'name' THEN
bnd_name := make_standard_name(bnd.name->'name');
bnd_name := lower(bnd.name->'name');
IF bnd_name = '' THEN
bnd_name := NULL;
END IF;
@@ -180,12 +180,14 @@ BEGIN
IF bnd.extratags ? 'place' and bnd_name is not null THEN
FOR linked_placex IN
SELECT * FROM placex
WHERE make_standard_name(name->'name') = bnd_name
WHERE (position(lower(name->'name') in bnd_name) > 0
OR position(bnd_name in lower(name->'name')) > 0)
AND placex.class = 'place' AND placex.type = bnd.extratags->'place'
AND placex.osm_type = 'N'
AND placex.linked_place_id is null
AND placex.rank_search < 26 -- needed to select the right index
AND _st_covers(bnd.geometry, placex.geometry)
AND placex.type != 'postcode'
AND ST_Covers(bnd.geometry, placex.geometry)
LOOP
{% if debug %}RAISE WARNING 'Found type-matching place node %', linked_placex.osm_id;{% endif %}
RETURN linked_placex;
@@ -201,7 +203,7 @@ BEGIN
AND placex.linked_place_id is null
AND placex.rank_search < 26
AND _st_covers(bnd.geometry, placex.geometry)
ORDER BY make_standard_name(name->'name') = bnd_name desc
ORDER BY lower(name->'name') = bnd_name desc
LOOP
{% if debug %}RAISE WARNING 'Found wikidata-matching place node %', linked_placex.osm_id;{% endif %}
RETURN linked_placex;
@@ -213,7 +215,7 @@ BEGIN
{% if debug %}RAISE WARNING 'Looking for nodes with matching names';{% endif %}
FOR linked_placex IN
SELECT placex.* from placex
WHERE make_standard_name(name->'name') = bnd_name
WHERE lower(name->'name') = bnd_name
AND ((bnd.rank_address > 0
and bnd.rank_address = (compute_place_rank(placex.country_code,
'N', placex.class,
@@ -221,9 +223,11 @@ BEGIN
false, placex.postcode)).address_rank)
OR (bnd.rank_address = 0 and placex.rank_search = bnd.rank_search))
AND placex.osm_type = 'N'
AND placex.class = 'place'
AND placex.linked_place_id is null
AND placex.rank_search < 26 -- needed to select the right index
AND _st_covers(bnd.geometry, placex.geometry)
AND placex.type != 'postcode'
AND ST_Covers(bnd.geometry, placex.geometry)
LOOP
{% if debug %}RAISE WARNING 'Found matching place node %', linked_placex.osm_id;{% endif %}
RETURN linked_placex;