table_comment

# File activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb, line 175
        def table_comment(table_name) # :nodoc:
          scope = quoted_scope(table_name, type: "BASE TABLE")
          if scope[:name]
            query_value(<<~SQL, "SCHEMA")
              SELECT pg_catalog.obj_description(c.oid, 'pg_class')
              FROM pg_catalog.pg_class c
                LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
              WHERE c.relname = #{scope[:name]}
                AND c.relkind IN (#{scope[:type]})
                AND n.nspname = #{scope[:schema]}
            SQL
          end
        end