dataservices-api/client/sql/21_bulk_geocoding_functions.sql

CREATE OR REPLACE FUNCTION cdb_dataservices_client.cdb_bulk_geocode_street_point (query text,
    street_column text, city_column text default null, state_column text default null, country_column text default null, batch_size integer DEFAULT NULL)
RETURNS SETOF cdb_dataservices_client.geocoding AS $$
DECLARE
  query_row_count integer;
  enough_quota boolean;
  remaining_quota integer;
  max_batch_size integer;

  cartodb_id_batch integer;
  batches_n integer;
  DEFAULT_BATCH_SIZE CONSTANT numeric := 100;
  MAX_SAFE_BATCH_SIZE CONSTANT numeric := 5000;
  current_row_count integer ;

  temp_table_name text;
BEGIN
  SELECT csqi.monthly_quota - csqi.used_quota AS remaining_quota, csqi.max_batch_size
  INTO remaining_quota, max_batch_size
  FROM cdb_dataservices_client.cdb_service_quota_info() csqi
  WHERE service = 'hires_geocoder';
  RAISE DEBUG 'remaining_quota: %; max_batch_size: %', remaining_quota, max_batch_size;

  IF batch_size IS NULL THEN
    batch_size := max_batch_size;
  ELSIF batch_size > max_batch_size THEN
    RAISE EXCEPTION 'batch_size must be lower than %', max_batch_size + 1;
  END IF;

  IF batch_size > MAX_SAFE_BATCH_SIZE THEN
    batch_size := MAX_SAFE_BATCH_SIZE;
  END IF;

  EXECUTE format('SELECT count(1), ceil(count(1)::float/%s) FROM (%s) _x', batch_size, query)
  INTO query_row_count, batches_n;

  RAISE DEBUG 'cdb_bulk_geocode_street_point --> query_row_count: %; query: %; country: %; state: %; city: %; street: %',
      query_row_count, query, country_column, state_column, city_column, street_column;
  SELECT cdb_dataservices_client.cdb_enough_quota('hires_geocoder', query_row_count) INTO enough_quota;
  IF remaining_quota < query_row_count THEN
    RAISE EXCEPTION 'Remaining quota: %. Estimated cost: %', remaining_quota, query_row_count;
  END IF;

  RAISE DEBUG 'batches_n: %', batches_n;

  temp_table_name := 'bulk_geocode_street_' || md5(random()::text);

  EXECUTE format('CREATE TEMPORARY TABLE %s ' ||
   '(cartodb_id integer, the_geom geometry(Multipolygon,4326), metadata jsonb)',
   temp_table_name);

  select
    coalesce(street_column, ''''''), coalesce(city_column, ''''''),
    coalesce(state_column, ''''''), coalesce(country_column, '''''')
  into street_column, city_column, state_column, country_column;

  IF batches_n > 0 THEN
    FOR cartodb_id_batch in 0..(batches_n - 1)
    LOOP

      EXECUTE format(
        'WITH geocoding_data as (' ||
        '   SELECT ' ||
        '      json_build_object(''id'', cartodb_id, ''address'', %s, ''city'', %s, ''state'', %s, ''country'', %s) as data , ' ||
        '      floor((row_number() over ())::float/$1) as batch' ||
        '   FROM (%s) _x' ||
        ') ' ||
        'INSERT INTO %s SELECT (cdb_dataservices_client._cdb_bulk_geocode_street_point(jsonb_agg(data))).* ' ||
        'FROM geocoding_data ' ||
        'WHERE batch = $2', street_column, city_column, state_column, country_column, query, temp_table_name)
      USING batch_size, cartodb_id_batch;

      GET DIAGNOSTICS current_row_count = ROW_COUNT;
      RAISE DEBUG 'Batch % --> %', cartodb_id_batch, current_row_count;

    END LOOP;
  END IF;

  RETURN QUERY EXECUTE 'SELECT * FROM ' || quote_ident(temp_table_name);
END;
$$ LANGUAGE 'plpgsql' SECURITY DEFINER VOLATILE PARALLEL UNSAFE;