# File lib/rubyrep/table_spec_resolver.rb, line 31
    def non_existing_tables(table_pairs)
      [:left, :right].inject({}) do |memo, database|
        found_tables = table_pairs.inject([]) do |phantom_tables, table_pair|
          phantom_tables << table_pair[database] unless tables(database).include?(table_pair[database])
          phantom_tables
        end
        memo[database] = found_tables unless found_tables.empty?
        memo
      end
    end