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Use _cdb_estimated_extent instead of ST_Extent

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With a 3.8M points table, this was a ~30% gain in my local env.
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Rafa de la Torre 2015-12-21 18:34:26 +01:00
parent 5010109c7d
commit 564ab75d2d
1 changed files with 2 additions and 2 deletions
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4
scripts-available/CDB_Overviews.sql
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@ -71,7 +71,7 @@ AS $$
-- considered tiles. -- considered tiles.
EXECUTE Format(' EXECUTE Format('
WITH RECURSIVE t(x, y, z, e) AS ( WITH RECURSIVE t(x, y, z, e) AS (
WITH ext AS (SELECT ST_Extent(the_geom_webmercator) g FROM %1$s), WITH ext AS (SELECT _cdb_estimated_extent(%6$s) as g),
base AS ( base AS (
SELECT (-floor(log(2, (greatest(ST_XMax(ext.g)-ST_XMin(ext.g), ST_YMax(ext.g)-ST_YMin(ext.g))/(%4$s*%5$s))::numeric)))::integer z SELECT (-floor(log(2, (greatest(ST_XMax(ext.g)-ST_XMin(ext.g), ST_YMax(ext.g)-ST_YMin(ext.g))/(%4$s*%5$s))::numeric)))::integer z
FROM ext FROM ext
@ -101,7 +101,7 @@ AS $$
WHERE t.e > %2$s AND t.z < (base.z + %3$s) WHERE t.e > %2$s AND t.z < (base.z + %3$s)
) )
SELECT MAX(e/ST_Area(CDB_XYZ_Extent(x,y,z))) FROM t where e > 0; SELECT MAX(e/ST_Area(CDB_XYZ_Extent(x,y,z))) FROM t where e > 0;
', reloid::text, min_features, nz, n, c) ', reloid::text, min_features, nz, n, c, reloid::oid)
INTO fd; INTO fd;
RETURN fd; RETURN fd;
END END