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getmeasure bypassing several older functions, areas not yet implemented

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This commit is contained in:
John Krauss
2016-07-13 12:20:01 -04:00
parent 5229279ee9
commit bbc6f9ef36
4 changed files with 77 additions and 161 deletions
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100
src/pg/sql/41_observatory_augmentation.sql
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@@ -345,37 +345,91 @@ CREATE OR REPLACE FUNCTION cdb_observatory.OBS_GetMeasure(
RETURNS NUMERIC
AS $$
DECLARE
map_type TEXT;
numer_aggregate TEXT;
numer_colname TEXT;
numer_geomref_colname TEXT;
numer_tablename TEXT;
denom_colname TEXT;
denom_geomref_colname TEXT;
denom_tablename TEXT;
geom_colname TEXT;
geom_geomref_colname TEXT;
geom_tablename TEXT;
result NUMERIC;
measure_ids TEXT[];
denominator_id TEXT;
vals NUMERIC[];
sql TEXT;
BEGIN
IF normalize ILIKE 'area' THEN
measure_ids := ARRAY[measure_id];
ELSIF normalize ILIKE 'denominator' THEN
EXECUTE 'SELECT (cdb_observatory._OBS_GetRelatedColumn(ARRAY[$1], ''denominator''))[1]
' INTO denominator_id
USING measure_id;
measure_ids := ARRAY[measure_id, denominator_id];
ELSIF normalize ILIKE 'none' THEN
-- TODO we need a switch on obs_get to disable area normalization
RAISE EXCEPTION 'No normalization not yet supported.';
EXECUTE
$query$
SELECT numer_aggregate, numer_colname, numer_geomref_colname, numer_tablename,
denom_colname, denom_geomref_colname, denom_tablename,
geom_colname, geom_geomref_colname, geom_tablename
FROM observatory.obs_meta
WHERE (geom_id = $1 OR ($1 = ''))
AND numer_id = $2
AND (numer_timespan = $3 OR ($3 = ''))
ORDER BY geom_weight DESC, numer_timespan DESC
LIMIT 1
$query$
INTO numer_colname, numer_geomref_colname, numer_table,
denom_colname, denom_geomref_colname, denom_table,
geom_colname, geom_geomref_colname, geom_table
USING COALESCE(boundary_id, ''), measure_id, COALESCE(time_span, '');
IF normalize ILIKE 'area' AND numer_aggregate ILIKE 'sum' THEN
-- area normalized
map_type := 'areaNormalized';
ELSIF normalize ILIKE 'denominator' AND numer_aggregate ILIKE 'sum' THEN
-- denominated
map_type := 'denominated';
ELSE
RAISE EXCEPTION 'Only valid inputs for "normalize" are "area" (default) and "denominator".';
-- predenominated
map_type := 'predenominated';
END IF;
EXECUTE '
SELECT ARRAY_AGG(val) FROM (SELECT (cdb_observatory._OBS_Get($1, $2, $3, $4)->>''value'')::NUMERIC val) b
'
INTO vals
USING geom, measure_ids, time_span, boundary_id;
IF normalize ILIKE 'denominator' THEN
RETURN (vals)[1]/(vals)[2];
IF ST_GeometryType(geom) = 'ST_Point' THEN
IF map_type = 'areaNormalied' THEN
sql = format('SELECT numer.%I / (ST_Area(geom.%I::Geography) * 1000000)
FROM observatory.%I numer, observatory.%I geom
WHERE numer.%I = geom.%I
AND ST_WITHIN(%L, geom.%I)',
numer_colname, geom_colname, numer_tablename,
geom_tablename, numer_geomref_colname,
geom_geomref_colname, geom, geom_colname);
ELSIF map_type = 'denominated' THEN
sql = format('SELECT numer.%I / denom.%I
FROM observatory.%I numer, observatory.%I geom, observatory.%I denom
WHERE numer.%I = geom.%I
AND geom.%I = denom.%I
AND ST_WITHIN(%L, geom.%I)',
numer_colname, denom_colname, numer_tablename,
geom_tablename, denom_tablename,
numer_geomref_colname, geom_geomref_colname,
geom_geomref_colname, denom_geomref_colname,
geom, geom_colname);
ELSIF map_type = 'predenominated' THEN
sql = format('SELECT numer.%I
FROM observatory.%I numer, observatory.%I geom
WHERE numer.%I = geom.%I
AND ST_WITHIN(%L, geom.%I)',
numer_colname, numer_tablename,
geom_tablename, numer_geomref_colname,
geom_geomref_colname, geom, geom_colname);
END IF;
ELSIF ST_GeometryType(geom) IN ('ST_Polygon', 'ST_MultiPolygon') THEN
IF map_type = 'areaNormalied' THEN
ELSIF map_type = 'denominated' THEN
ELSIF map_type = 'predenominated' THEN
END IF;
ELSE
RETURN (vals)[1];
RAISE EXCEPTION 'Invalid geometry type (%), can only handle ''ST_Point'', ''ST_Polygon'', and ''ST_MultiPolygon''',
ST_GeometryType(geom);
END IF;
EXECUTE sql INTO result;
RETURN result;
END;
$$ LANGUAGE plpgsql;