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Handle geometry column with no metadata SRID (grrr) but

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a valid SRID on the geometry objects themselves
This commit is contained in:
Paul Ramsey
2015-04-21 06:58:33 -07:00
parent 14414c4bf3
commit bb685795d5
1 changed files with 37 additions and 15 deletions
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52
scripts-available/CDB_CartodbfyTable.sql
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@@ -861,16 +861,18 @@ CREATE OR REPLACE FUNCTION _CDB_Has_Usable_Geom(reloid REGCLASS, geom_name TEXT,
RETURNS BOOLEAN
AS $$
DECLARE
rec RECORD;
r1 RECORD;
r2 RECORD;
has_geom BOOLEAN := false;
has_mercgeom BOOLEAN := false;
srid INTEGER := 0;
str TEXT;
BEGIN
RAISE DEBUG 'Entered _CDB_Has_Usable_Geom';
-- Do we have a column we can use?
FOR rec IN
FOR r1 IN
SELECT
a.attname,
CASE WHEN t.typname = 'geometry' THEN postgis_typmod_srid(a.atttypmod) ELSE NULL END AS srid,
@@ -881,21 +883,41 @@ BEGIN
WHERE c.oid = reloid
AND a.attnum > 0
AND NOT a.attisdropped
AND postgis_typmod_srid(a.atttypmod) IN (4326, 3857)
AND postgis_typmod_srid(a.atttypmod) IN (4326, 3857, 0)
ORDER BY a.attnum
LOOP
RAISE DEBUG '_CDB_Has_Usable_Geom, checking ''%''', rec.attname;
RAISE DEBUG '_CDB_Has_Usable_Geom, checking ''%''', r1.attname;
-- The column SRID could be 0 but the data might have a
-- good SRID value in it, so we have to check that before
-- going forward (*sigh*)
IF r1.srid = 0 THEN
RAISE DEBUG '_CDB_Has_Usable_Geom, no column srid, checking data row';
EXECUTE Format('SELECT ST_SRID(%s) AS srid FROM %s LIMIT 1', r1.attname, reloid::text)
INTO r2;
IF r2.srid > 0 THEN
srid := r2.srid;
END IF;
ELSE
srid := r1.srid;
END IF;
RAISE DEBUG '_CDB_Has_Usable_Geom, SRID(%) is %', r1.attname, srid;
-- Geographic: Right name, but wrong type? Rename it out of the way!
IF rec.attname = geom_name AND rec.typname != 'geometry' THEN
IF r1.attname = geom_name AND r1.typname != 'geometry' THEN
str := _CDB_Unique_Column_Name(reloid, geom_name);
EXECUTE Format('ALTER TABLE %s RENAME COLUMN %s TO %s', reloid::text, geom_name, str);
RAISE DEBUG '_CDB_Has_Usable_Geom renamed % to %', geom_name, str;
END IF;
-- Mercator: Right name, but wrong type? Rename it out of the way!
IF rec.attname = mercgeom_name AND rec.typname != 'geometry' THEN
IF r1.attname = mercgeom_name AND r1.typname != 'geometry' THEN
str := _CDB_Unique_Column_Name(reloid, geom_name);
EXECUTE Format('ALTER TABLE %s RENAME COLUMN %s TO _%s', reloid::text, geom_name, str);
RAISE DEBUG '_CDB_Has_Usable_Geom renamed % to %', geom_name, str;
@@ -903,25 +925,25 @@ BEGIN
-- Geographic: If it's the right name and right SRID, we can use it in place without
-- transforming it
IF rec.attname = geom_name AND rec.srid = 4326 AND rec.typname = 'geometry' THEN
IF r1.attname = geom_name AND srid = 4326 AND r1.typname = 'geometry' THEN
has_geom = true;
RAISE DEBUG '_CDB_Has_Usable_Geom found acceptable ''%''', geom_name;
-- If it's the right SRID and wrong name, we can just rename it
ELSIF rec.srid = 4326 AND rec.typname = 'geometry' THEN
EXECUTE Format('ALTER TABLE %s RENAME COLUMN %s TO %s', reloid::text, rec.attname, geom_name);
RAISE DEBUG '_CDB_Has_Usable_Geom renamed % to %', rec.attname, geom_name;
ELSIF srid = 4326 AND r1.typname = 'geometry' THEN
EXECUTE Format('ALTER TABLE %s RENAME COLUMN %s TO %s', reloid::text, r1.attname, geom_name);
RAISE DEBUG '_CDB_Has_Usable_Geom renamed % to %', r1.attname, geom_name;
has_geom = true;
END IF;
-- Mercator: If it's the right name and right SRID, we can use it in place without
-- transforming it
IF rec.attname = mercgeom_name AND rec.srid = 3857 AND rec.typname = 'geometry' THEN
IF r1.attname = mercgeom_name AND srid = 3857 AND r1.typname = 'geometry' THEN
has_mercgeom = true;
RAISE DEBUG '_CDB_Has_Usable_Geom found acceptable ''%''', mercgeom_name;
-- If it's the right SRID and wrong name, we can just rename it
ELSIF rec.srid = 3857 AND rec.typname = 'geometry' THEN
EXECUTE Format('ALTER TABLE %s RENAME COLUMN %s TO %s', reloid::text, rec.attname, mercgeom_name);
RAISE DEBUG '_CDB_Has_Usable_Geom renamed % to %', rec.attname, mercgeom_name;
ELSIF srid = 3857 AND r1.typname = 'geometry' THEN
EXECUTE Format('ALTER TABLE %s RENAME COLUMN %s TO %s', reloid::text, r1.attname, mercgeom_name);
RAISE DEBUG '_CDB_Has_Usable_Geom renamed % to %', r1.attname, mercgeom_name;
has_mercgeom = true;
END IF;