occur. (This last trigger is disabled by default and can be enabled

with the <literal>autosummarize</literal> parameter.)

Conversely, a range can be de-summarized using the

<function>brin_desummarize_range(regclass, bigint)</function>range,

<function>brin_desummarize_range(regclass, bigint)</function>function,

which is useful when the index tuple is no longer a very good

representation because the existing values have changed.

</para>