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Extract query into _cdb_geom_candidate_columns #141

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This commit is contained in:
Rafa de la Torre 2015-09-14 11:50:10 +02:00
parent 9ec24c1aff
commit 581835d4ff
1 changed files with 30 additions and 15 deletions
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45
scripts-available/CDB_CartodbfyTable.sql
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@ -683,8 +683,36 @@ BEGIN
END;
$$ LANGUAGE 'plpgsql';
-- Return a set of columns that can be candidates to be the_geom
-- with some extra information to filter them out.
CREATE OR REPLACE FUNCTION _cdb_geom_candidate_columns(reloid REGCLASS)
RETURNS TABLE (attname name, srid integer, typname name, desired_attname text, desired_srid integer)
AS $$
DECLARE
const RECORD;
BEGIN
const := _CDB_Columns();
RETURN QUERY
SELECT
a.attname,
CASE WHEN t.typname = 'geometry' THEN postgis_typmod_srid(a.atttypmod) ELSE NULL END AS srid,
t.typname,
f.desired_attname, f.desired_srid
FROM pg_class c
JOIN pg_attribute a ON a.attrelid = c.oid
JOIN pg_type t ON a.atttypid = t.oid,
(VALUES (const.geomcol, 4326), (const.mercgeomcol, 3857) ) as f(desired_attname, desired_srid)
WHERE c.oid = reloid
AND a.attnum > 0
AND NOT a.attisdropped
AND postgis_typmod_srid(a.atttypmod) IN (4326, 3857, 0)
ORDER BY t.oid ASC;
END;
$$ LANGUAGE 'plpgsql';
DROP FUNCTION IF EXISTS _CDB_Has_Usable_Geom(regclass);
CREATE OR REPLACE FUNCTION _CDB_Has_Usable_Geom(reloid REGCLASS)
RETURNS RECORD
AS $$
@ -718,20 +746,7 @@ BEGIN
-- Do we have a column we can use?
FOR r1 IN
SELECT
a.attname,
CASE WHEN t.typname = 'geometry' THEN postgis_typmod_srid(a.atttypmod) ELSE NULL END AS srid,
t.typname,
f.desired_attname, f.desired_srid
FROM pg_class c
JOIN pg_attribute a ON a.attrelid = c.oid
JOIN pg_type t ON a.atttypid = t.oid,
(VALUES (const.geomcol, 4326), (const.mercgeomcol, 3857) ) as f(desired_attname, desired_srid)
WHERE c.oid = reloid
AND a.attnum > 0
AND NOT a.attisdropped
AND postgis_typmod_srid(a.atttypmod) IN (4326, 3857, 0)
ORDER BY t.oid ASC
SELECT * FROM _cdb_geom_candidate_columns(reloid)
LOOP
RAISE DEBUG 'CDB(_CDB_Has_Usable_Geom): %', Format('checking column ''%s''', r1.attname);