partition creation function

  CREATE OR REPLACE FUNCTION enqueue(count int8, x anyarray) RETURNS void AS $$
    DECLARE
      startValue int8;
      lastValue int8;
      currentValue int8;
      partition_name text;
      doubleCount int8;
    BEGIN
      doubleCount :=  2 * count;
      SELECT nextval('modified_index') INTO currentValue ;

      startValue := ((currentValue + 1) / doubleCount) * doubleCount;
      lastValue := startValue + doubleCount - 1;

      partition_name := 'payloads_' || startValue || '_' || lastValue ;
      IF NOT EXISTS(SELECT relname FROM pg_class WHERE relname=partition_name) THEN
        EXECUTE
          format(E'CREATE TABLE %I partition of payloads for values from (%L) to (%L);',
            partition_name, startValue, lastValue);
      END IF;

    --  EXECUTE 'INSERT INTO payloads (attempts, value) VALUES (0, $1)' USING x;
      EXECUTE 'INSERT INTO payloads (attempts, value) SELECT 0, * FROM unnest($1)' USING x;
    END;
  $$ LANGUAGE plpgsql;