Deprecate creation of new overview tables
This commit is contained in:
Raúl Marín
parent
cdb9e683ab
commit
5c3df02257
1
NEWS.md
1
NEWS.md
@ -1,6 +1,7 @@
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0.37.0 (XXXX-XX-XX)
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0.37.0 (XXXX-XX-XX)
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* Raised minimum PG version to 11.
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* Raised minimum PG version to 11.
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* Add `CDB_RegenerateTable` to regenerate a table.
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* Add `CDB_RegenerateTable` to regenerate a table.
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* Deprecate creation of new overview tables.
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0.36.0 (2020-02-13)
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0.36.0 (2020-02-13)
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* Make `_CDB_Group_API_Auth` python3 compatible by passing bytes representation instead of a string.
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* Make `_CDB_Group_API_Auth` python3 compatible by passing bytes representation instead of a string.
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@ -1,3 +1,8 @@
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============================ WARNING ===================================
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Creating overviews is no longer supported.
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============================ WARNING ===================================
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Overviews are tables that represent a *reduced* version of a dataset intended
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Overviews are tables that represent a *reduced* version of a dataset intended
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for efficient rendering at certain zoom levels while preserving the
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for efficient rendering at certain zoom levels while preserving the
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general visual appearance of the complete dataset.
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general visual appearance of the complete dataset.
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@ -268,44 +268,7 @@ AS $$
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overview_table_name TEXT;
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overview_table_name TEXT;
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creation_clause TEXT;
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creation_clause TEXT;
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BEGIN
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BEGIN
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overview_rel := @extschema@._CDB_Overview_Name(reloid, ref_z, overview_z);
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RAISE EXCEPTION 'Creating overviews is deprecated';
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-- TODO: compute fraction from tolerance_px if not NULL
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fraction := power(2, 2*(overview_z - ref_z));
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SELECT * FROM @extschema@._cdb_split_table_name(reloid) INTO schema_name, table_name;
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overview_table_name := Format('%I.%I', schema_name, overview_rel);
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IF has_overview_created THEN
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RAISE NOTICE 'Sampling reduce stategy deleting and inserting because % has overviews', overview_table_name;
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EXECUTE Format('DELETE FROM %s;', overview_table_name);
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creation_clause := Format('INSERT INTO %s', overview_table_name);
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ELSE
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RAISE NOTICE 'Sampling reduce stategy creating a new table overview %', overview_table_name;
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creation_clause := Format('CREATE TABLE %s AS', overview_table_name);
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END IF;
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-- Estimate number of rows
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SELECT reltuples, relpages FROM pg_class INTO STRICT class_info
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WHERE oid = reloid::oid;
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IF class_info.relpages < 2 OR fraction > 0.5 THEN
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-- We'll avoid possible CDB_RandomTids problems
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EXECUTE Format('
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%s SELECT * FROM %s WHERE random() < %s;
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', creation_clause, reloid, fraction);
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ELSE
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num_samples := ceil(class_info.reltuples*fraction);
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EXECUTE Format('
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%1$s SELECT * FROM %2$s
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WHERE ctid = ANY (
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ARRAY[
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(SELECT @extschema@.CDB_RandomTids(''%2$s'', %3$s))
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]
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);
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', creation_clause, reloid, num_samples);
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END IF;
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RETURN Format('%s', overview_table_name)::regclass;
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END;
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END;
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$$ LANGUAGE PLPGSQL VOLATILE PARALLEL UNSAFE;
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$$ LANGUAGE PLPGSQL VOLATILE PARALLEL UNSAFE;
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@ -331,36 +294,7 @@ AS $$
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overview_scheme TEXT;
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overview_scheme TEXT;
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overview_name TEXT;
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overview_name TEXT;
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BEGIN
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BEGIN
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-- This function will only register a table as an overview table if it matches
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RAISE EXCEPTION 'Creating overviews is deprecated';
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-- the overviews naming scheme for the dataset and z level and the table belongs
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-- to the same scheme as the the dataset
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SELECT * FROM @extschema@._cdb_split_table_name(dataset) INTO dataset_scheme, dataset_name;
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SELECT * FROM @extschema@._cdb_split_table_name(overview_table) INTO overview_scheme, overview_name;
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IF dataset_scheme = overview_scheme AND
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overview_name = @extschema@._CDB_OverviewTableName(dataset_name, overview_z) THEN
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-- preserve the owner of the base table
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SELECT u.usename
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FROM pg_catalog.pg_class c
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JOIN pg_catalog.pg_user u ON (c.relowner=u.usesysid)
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JOIN pg_namespace n ON n.oid = c.relnamespace
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WHERE c.relname = dataset_name::text AND n.nspname = dataset_scheme
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INTO table_owner;
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EXECUTE Format('ALTER TABLE IF EXISTS %s OWNER TO %I;', overview_table::text, table_owner);
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-- preserve the table privileges
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UPDATE pg_class c_to
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SET relacl = c_from.relacl
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FROM pg_class c_from
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WHERE c_from.oid = dataset
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AND c_to.oid = overview_table;
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PERFORM @extschema@._CDB_Add_Indexes(overview_table);
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-- TODO: If metadata about existing overviews is to be stored
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-- it should be done here (CDB_Overviews would consume such metadata)
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END IF;
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END
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END
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$$ LANGUAGE PLPGSQL
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$$ LANGUAGE PLPGSQL
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VOLATILE
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VOLATILE
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@ -617,105 +551,7 @@ AS $$
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overview_table_name TEXT;
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overview_table_name TEXT;
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creation_clause TEXT;
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creation_clause TEXT;
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BEGIN
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BEGIN
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SELECT @extschema@._CDB_GeometryTypes(reloid) INTO gtypes;
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RAISE EXCEPTION 'Creating overviews is deprecated';
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IF gtypes IS NULL OR array_upper(gtypes, 1) <> 1 OR gtypes[1] <> 'ST_Point' THEN
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-- This strategy only supports datasets with point geomety
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RETURN NULL;
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END IF;
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--TODO: check applicability: geometry type, minimum number of points...
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overview_rel := @extschema@._CDB_Overview_Name(reloid, ref_z, overview_z);
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-- Grid size in pixels at Z level overview_z
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IF grid_px IS NULL THEN
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grid_px := 1.0;
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END IF;
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SELECT * FROM @extschema@._cdb_split_table_name(reloid) INTO schema_name, table_name;
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-- pixel_m: size of a pixel in webmercator units (meters)
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SELECT @extschema@.CDB_XYZ_Resolution(overview_z) INTO pixel_m;
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-- grid size in meters
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grid_m = grid_px * pixel_m;
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attributes := @extschema@._CDB_Aggregable_Attributes_Expression(reloid);
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aggr_attributes := @extschema@._CDB_Aggregated_Attributes_Expression(reloid);
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IF attributes <> '' THEN
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attributes := ', ' || attributes;
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END IF;
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IF aggr_attributes <> '' THEN
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aggr_attributes := aggr_attributes || ', ';
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END IF;
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-- Center of each cell:
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cell_x := Format('gx*%1$s + %2$s', grid_m, grid_m/2);
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cell_y := Format('gy*%1$s + %2$s', grid_m, grid_m/2);
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-- Displacement to the nearest pixel center:
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IF MOD(grid_px::numeric, 1.0::numeric) = 0 THEN
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offset_m := pixel_m/2 - MOD((grid_m/2)::numeric, pixel_m::numeric)::float8;
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offset_x := Format('%s', offset_m);
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offset_y := Format('%s', offset_m);
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ELSE
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offset_x := Format('%2$s/2 - MOD((%1$s)::numeric, (%2$s)::numeric)::float8', cell_x, pixel_m);
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offset_y := Format('%2$s/2 - MOD((%1$s)::numeric, (%2$s)::numeric)::float8', cell_y, pixel_m);
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END IF;
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point_geom := Format('@postgisschema@.ST_SetSRID(@postgisschema@.ST_MakePoint(%1$s + %3$s, %2$s + %4$s), 3857)', cell_x, cell_y, offset_x, offset_y);
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-- compute the resulting columns in the same order as in the base table
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WITH cols AS (
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SELECT
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CASE c
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WHEN 'cartodb_id' THEN 'cartodb_id'
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WHEN 'the_geom' THEN
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Format('@postgisschema@.ST_Transform(%s, 4326) AS the_geom', point_geom)
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WHEN 'the_geom_webmercator' THEN
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Format('%s AS the_geom_webmercator', point_geom)
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ELSE c::text
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END AS column
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FROM @extschema@.CDB_ColumnNames(reloid) c
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)
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SELECT string_agg(s.column, ',') FROM (
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SELECT * FROM cols
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) AS s INTO columns;
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IF NOT columns LIKE '%_feature_count%' THEN
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columns := columns || ', n AS _feature_count';
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END IF;
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overview_table_name := Format('%I.%I', schema_name, overview_rel);
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IF has_overview_created THEN
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RAISE NOTICE 'Grid cluster strategy deleting and inserting because % has overviews', overview_table_name;
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EXECUTE Format('DELETE FROM %s;', overview_table_name);
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creation_clause := Format('INSERT INTO %s', overview_table_name);
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ELSE
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RAISE NOTICE 'Grid cluster strategy creating a new table overview %', overview_table_name;
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creation_clause := Format('CREATE TABLE %s AS', overview_table_name);
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END IF;
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-- Now we cluster the data using a grid of size grid_m
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-- and selecte the centroid (average coordinates) of each cluster.
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-- If we had a selected numeric attribute of interest we could use it
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-- as a weight for the average coordinates.
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EXECUTE Format('
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%3$s
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WITH clusters AS (
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SELECT
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%5$s
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count(*) AS n,
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Floor(@postgisschema@.ST_X(f.the_geom_webmercator)/%2$s)::int AS gx,
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Floor(@postgisschema@.ST_Y(f.the_geom_webmercator)/%2$s)::int AS gy,
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MIN(cartodb_id) AS cartodb_id
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FROM %1$s f
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WHERE f.the_geom_webmercator IS NOT NULL
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GROUP BY gx, gy
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)
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SELECT %6$s FROM clusters
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', reloid::text, grid_m, creation_clause, attributes, aggr_attributes, columns);
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RETURN Format('%s', overview_table_name)::regclass;
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END;
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END;
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$$ LANGUAGE PLPGSQL VOLATILE PARALLEL UNSAFE;
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$$ LANGUAGE PLPGSQL VOLATILE PARALLEL UNSAFE;
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@ -872,104 +708,7 @@ AS $$
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overview_table_name TEXT;
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overview_table_name TEXT;
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creation_clause TEXT;
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creation_clause TEXT;
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BEGIN
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BEGIN
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SELECT @extschema@._CDB_GeometryTypes(reloid) INTO gtypes;
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RAISE EXCEPTION 'Creating overviews is deprecated';
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IF gtypes IS NULL OR array_upper(gtypes, 1) <> 1 OR gtypes[1] <> 'ST_Point' THEN
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-- This strategy only supports datasets with point geomety
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RETURN NULL;
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END IF;
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--TODO: check applicability: geometry type, minimum number of points...
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overview_rel := @extschema@._CDB_Overview_Name(reloid, ref_z, overview_z);
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-- Grid size in pixels at Z level overview_z
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IF grid_px IS NULL THEN
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grid_px := 1.0;
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END IF;
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SELECT * FROM @extschema@._cdb_split_table_name(reloid) INTO schema_name, table_name;
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-- pixel_m: size of a pixel in webmercator units (meters)
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SELECT @extschema@.CDB_XYZ_Resolution(overview_z) INTO pixel_m;
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-- grid size in meters
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grid_m = grid_px * pixel_m;
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attributes := @extschema@._CDB_Aggregable_Attributes_Expression(reloid);
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aggr_attributes := @extschema@._CDB_Aggregated_Attributes_Expression(reloid);
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IF attributes <> '' THEN
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attributes := ', ' || attributes;
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END IF;
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IF aggr_attributes <> '' THEN
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aggr_attributes := aggr_attributes || ', ';
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END IF;
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-- Center of each cell:
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cell_x := Format('gx*%1$s + %2$s', grid_m, grid_m/2);
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cell_y := Format('gy*%1$s + %2$s', grid_m, grid_m/2);
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-- Displacement to the nearest pixel center:
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IF MOD(grid_px::numeric, 1.0::numeric) = 0 THEN
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offset_m := pixel_m/2 - MOD((grid_m/2)::numeric, pixel_m::numeric)::float8;
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offset_x := Format('%s', offset_m);
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offset_y := Format('%s', offset_m);
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ELSE
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offset_x := Format('%2$s/2 - MOD((%1$s)::numeric, (%2$s)::numeric)::float8', cell_x, pixel_m);
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offset_y := Format('%2$s/2 - MOD((%1$s)::numeric, (%2$s)::numeric)::float8', cell_y, pixel_m);
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END IF;
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point_geom := Format('@postgisschema@.ST_SetSRID(@postgisschema@.ST_MakePoint(%1$s + %3$s, %2$s + %4$s), 3857)', cell_x, cell_y, offset_x, offset_y);
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-- compute the resulting columns in the same order as in the base table
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WITH cols AS (
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SELECT
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CASE c
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WHEN 'cartodb_id' THEN 'cartodb_id'
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ELSE c::text
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END AS column
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FROM @extschema@.CDB_ColumnNames(reloid) c
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)
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SELECT string_agg(s.column, ',') FROM (
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SELECT * FROM cols
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) AS s INTO columns;
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IF NOT columns LIKE '%_feature_count%' THEN
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columns := columns || ', n AS _feature_count';
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END IF;
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overview_table_name := Format('%I.%I', schema_name, overview_rel);
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IF has_overview_created THEN
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RAISE NOTICE 'Grid cluster sampling strategy deleting and inserting because % has overviews', overview_table_name;
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EXECUTE Format('DELETE FROM %s;', overview_table_name);
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creation_clause := Format('INSERT INTO %s', overview_table_name);
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ELSE
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RAISE NOTICE 'Grid cluster sampling strategy creating a new table overview %', overview_table_name;
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creation_clause := Format('CREATE TABLE %s AS', overview_table_name);
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END IF;
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-- Now we cluster the data using a grid of size grid_m
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-- and select the centroid (average coordinates) of each cluster.
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-- If we had a selected numeric attribute of interest we could use it
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-- as a weight for the average coordinates.
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EXECUTE Format('
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%3$s
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WITH clusters AS (
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SELECT
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%5$s
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count(*) AS n,
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Floor(@postgisschema@.ST_X(_f.the_geom_webmercator)/%2$s)::int AS gx,
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Floor(@postgisschema@.ST_Y(_f.the_geom_webmercator)/%2$s)::int AS gy,
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MIN(cartodb_id) AS cartodb_id
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FROM %1$s _f
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GROUP BY gx, gy
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),
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cluster_geom AS (
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SELECT the_geom, the_geom_webmercator, clusters.*
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FROM clusters INNER JOIN %1$s _g ON (clusters.cartodb_id = _g.cartodb_id)
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)
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SELECT %6$s FROM cluster_geom
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', reloid::text, grid_m, creation_clause, attributes, aggr_attributes, columns);
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RETURN Format('%s', overview_table_name)::regclass;
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END;
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END;
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$$ LANGUAGE PLPGSQL VOLATILE PARALLEL UNSAFE;
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$$ LANGUAGE PLPGSQL VOLATILE PARALLEL UNSAFE;
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@ -990,9 +729,7 @@ AS $$
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DECLARE
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DECLARE
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tolerance_px FLOAT8;
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tolerance_px FLOAT8;
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BEGIN
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BEGIN
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-- Use the default tolerance
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RAISE EXCEPTION 'Creating overviews is deprecated';
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tolerance_px := 1.0;
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RETURN @extschema@.CDB_CreateOverviewsWithToleranceInPixels(reloid, tolerance_px, refscale_strategy, reduce_strategy);
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END;
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END;
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$$ LANGUAGE PLPGSQL VOLATILE PARALLEL UNSAFE;
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$$ LANGUAGE PLPGSQL VOLATILE PARALLEL UNSAFE;
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@ -1011,54 +748,7 @@ DECLARE
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has_counter_column boolean;
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has_counter_column boolean;
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has_overviews_for_z boolean;
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has_overviews_for_z boolean;
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BEGIN
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BEGIN
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-- Determine the referece zoom level
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RAISE EXCEPTION 'Creating overviews is deprecated';
|
||||||
EXECUTE 'SELECT ' || quote_ident(refscale_strategy::text) || Format('(''%s'', %s);', reloid, tolerance_px) INTO ref_z;
|
|
||||||
|
|
||||||
IF ref_z < 0 OR ref_z IS NULL THEN
|
|
||||||
RETURN NULL;
|
|
||||||
END IF;
|
|
||||||
|
|
||||||
-- Determine overlay zoom levels
|
|
||||||
-- TODO: should be handled by the refscale_strategy?
|
|
||||||
overview_z := ref_z - 1;
|
|
||||||
WHILE overview_z >= 0 LOOP
|
|
||||||
SELECT array_append(overviews_z, overview_z) INTO overviews_z;
|
|
||||||
overview_z := overview_z - overviews_step;
|
|
||||||
END LOOP;
|
|
||||||
|
|
||||||
-- TODO Check for non-used overview to delete them but we have to be aware that the
|
|
||||||
-- current queries, for example from a tiler, are been used with the old overviews
|
|
||||||
-- so if we remove the overviews in the process this could lead to errors
|
|
||||||
|
|
||||||
-- Create or reganerate overlay tables
|
|
||||||
base_z := ref_z;
|
|
||||||
base_rel := reloid;
|
|
||||||
FOREACH overview_z IN ARRAY overviews_z LOOP
|
|
||||||
SELECT CASE WHEN count(*) > 0 THEN TRUE ELSE FALSE END from CDB_Overviews(reloid) WHERE z = overview_z INTO has_overviews_for_z;
|
|
||||||
EXECUTE 'SELECT ' || quote_ident(reduce_strategy::text) || Format('(''%s'', %s, %s, %s, ''%s'');', base_rel, base_z, overview_z, tolerance_px, has_overviews_for_z) INTO base_rel;
|
|
||||||
IF base_rel IS NULL THEN
|
|
||||||
EXIT;
|
|
||||||
END IF;
|
|
||||||
base_z := overview_z;
|
|
||||||
IF NOT has_overviews_for_z THEN
|
|
||||||
RAISE NOTICE 'Registering overview: %', base_rel;
|
|
||||||
PERFORM _CDB_Register_Overview(reloid, base_rel, base_z);
|
|
||||||
END IF;
|
|
||||||
SELECT array_append(overview_tables, base_rel) INTO overview_tables;
|
|
||||||
END LOOP;
|
|
||||||
|
|
||||||
IF overview_tables IS NOT NULL AND array_length(overview_tables, 1) > 0 THEN
|
|
||||||
SELECT EXISTS (
|
|
||||||
SELECT * FROM @extschema@.CDB_ColumnNames(reloid) as colname WHERE colname = '_feature_count'
|
|
||||||
) INTO has_counter_column;
|
|
||||||
IF NOT has_counter_column THEN
|
|
||||||
EXECUTE Format('
|
|
||||||
ALTER TABLE %s ADD COLUMN _feature_count integer DEFAULT 1;
|
|
||||||
', reloid);
|
|
||||||
END IF;
|
|
||||||
END IF;
|
|
||||||
|
|
||||||
RETURN overview_tables;
|
|
||||||
END;
|
END;
|
||||||
$$ LANGUAGE PLPGSQL VOLATILE PARALLEL UNSAFE;
|
$$ LANGUAGE PLPGSQL VOLATILE PARALLEL UNSAFE;
|
||||||
|
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user