Remove unused and old _CDB_GridCluster_Reduce_Strategy function for overviews

scripts-available/CDB_Overviews.sql

@@ -697,122 +697,6 @@ AS $$
   END;
 $$ LANGUAGE PLPGSQL;
 
-
-CREATE OR REPLACE FUNCTION _CDB_GridCluster_Reduce_Strategy(reloid REGCLASS, ref_z INTEGER, overview_z INTEGER, grid_px FLOAT8 DEFAULT NULL)
-RETURNS REGCLASS
-AS $$
-  DECLARE
-    overview_rel TEXT;
-    reduction FLOAT8;
-    base_name TEXT;
-    pixel_m FLOAT8;
-    grid_m FLOAT8;
-    offset_m FLOAT8;
-    offset_x TEXT;
-    offset_y TEXT;
-    cell_x TEXT;
-    cell_y TEXT;
-    aggr_attributes TEXT;
-    attributes TEXT;
-    columns TEXT;
-    gtypes TEXT[];
-    schema_name TEXT;
-    table_name TEXT;
-    point_geom TEXT;
-  BEGIN
-    SELECT _CDB_GeometryTypes(reloid) INTO gtypes;
-    IF gtypes IS NULL OR array_upper(gtypes, 1) <> 1 OR gtypes[1] <> 'ST_Point' THEN
-      -- This strategy only supports datasets with point geomety
-      RETURN NULL;
-    END IF;
-
-    --TODO: check applicability: geometry type, minimum number of points...
-
-    overview_rel := _CDB_Overview_Name(reloid, ref_z, overview_z);
-
-    -- Grid size in pixels at Z level overview_z
-    IF grid_px IS NULL THEN
-      grid_px := 1.0;
-    END IF;
-
-    SELECT * FROM _cdb_split_table_name(reloid) INTO schema_name, table_name;
-
-    -- pixel_m: size of a pixel in webmercator units (meters)
-    SELECT CDB_XYZ_Resolution(overview_z) INTO pixel_m;
-    -- grid size in meters
-    grid_m = grid_px * pixel_m;
-
-    attributes := _CDB_Aggregable_Attributes_Expression(reloid);
-    aggr_attributes := _CDB_Aggregated_Attributes_Expression(reloid);
-    IF attributes <> '' THEN
-      attributes := ', ' || attributes;
-    END IF;
-    IF aggr_attributes <> '' THEN
-      aggr_attributes := aggr_attributes || ', ';
-    END IF;
-
-    -- Center of each cell:
-    cell_x := Format('gx*%1$s + %2$s', grid_m, grid_m/2);
-    cell_y := Format('gy*%1$s + %2$s', grid_m, grid_m/2);
-
-    -- Displacement to the nearest pixel center:
-    IF MOD(grid_px::numeric, 1.0::numeric) = 0 THEN
-      offset_m := pixel_m/2 - MOD((grid_m/2)::numeric, pixel_m::numeric)::float8;
-      offset_x := Format('%s', offset_m);
-      offset_y := Format('%s', offset_m);
-    ELSE
-      offset_x := Format('%2$s/2 - MOD((%1$s)::numeric, (%2$s)::numeric)::float8', cell_x, pixel_m);
-      offset_y := Format('%2$s/2 - MOD((%1$s)::numeric, (%2$s)::numeric)::float8', cell_y, pixel_m);
-    END IF;
-
-    point_geom := Format('ST_SetSRID(ST_MakePoint(%1$s + %3$s, %2$s + %4$s), 3857)', cell_x, cell_y, offset_x, offset_y);
-
-    -- compute the resulting columns in the same order as in the base table
-    WITH cols AS (
-      SELECT
-        CASE c
-        WHEN 'cartodb_id' THEN 'cartodb_id'
-        WHEN 'the_geom' THEN
-          Format('ST_Transform(%s, 4326) AS the_geom', point_geom)
-        WHEN 'the_geom_webmercator' THEN
-           Format('%s AS the_geom_webmercator', point_geom)
-        ELSE c
-        END AS column
-        FROM CDB_ColumnNames(reloid) c
-    )
-    SELECT string_agg(s.column, ',') FROM (
-      SELECT * FROM cols
-    ) AS s INTO columns;
-
-    IF NOT columns LIKE '%_feature_count%' THEN
-      columns := columns || ', n AS _feature_count';
-    END IF;
-
-    EXECUTE Format('DROP TABLE IF EXISTS %I.%I CASCADE;', schema_name, overview_rel);
-
-    -- Now we cluster the data using a grid of size grid_m
-    -- and selecte the centroid (average coordinates) of each cluster.
-    -- If we had a selected numeric attribute of interest we could use it
-    -- as a weight for the average coordinates.
-    EXECUTE Format('
-      CREATE TABLE %7$I.%3$I AS
-         WITH clusters AS (
-           SELECT
-             %5$s
-             count(*) AS n,
-             Floor(ST_X(f.the_geom_webmercator)/%2$s)::int AS gx,
-             Floor(ST_Y(f.the_geom_webmercator)/%2$s)::int AS gy,
-             MIN(cartodb_id) AS cartodb_id
-          FROM %1$s f
-          GROUP BY gx, gy
-         )
-         SELECT %6$s FROM clusters
-    ', reloid::text, grid_m, overview_rel, attributes, aggr_attributes, columns, schema_name);
-
-    RETURN Format('%I.%I', schema_name, overview_rel)::regclass;
-  END;
-$$ LANGUAGE PLPGSQL;
-
 -- This strategy places the aggregation of each cluster at the centroid of the cluster members.
 CREATE OR REPLACE FUNCTION _CDB_GridClusterCentroid_Reduce_Strategy(reloid REGCLASS, ref_z INTEGER, overview_z INTEGER, grid_px FLOAT8 DEFAULT NULL)
 RETURNS REGCLASS