Specifies which database user name(s) this record

matches. The value <literal>all</literal> specifies that it

matches all users. Otherwise, this is either the name of a specific

database user, a regular expression(when starting with a slash

database user, a regular expression when starting with a slash

(<literal>/</literal>), or a group name preceded by <literal>+</literal>.

(Recall that there is no real distinction between users and groups

in <productname>PostgreSQL</productname>; a <literal>+</literal> mark really means

<literal>siglen</literal> determines the

signature length in bytes. The default signature length is 8 bytes.

The length must be a positive multiple of <type>int</type> alignment

(4 bytes on most machines)) up to 2024. Longer

(4 bytes on most machines) up to 2024. Longer

signatures lead to a more precise search (scanning a smaller fraction of the index and

fewer heap pages), at the cost of a larger index.

</para>

<varname>attnum</varname> (1-based) is a member of this bitmap set,

call <literal>bms_is_member(attnum -

FirstLowInvalidHeapAttributeNumber,

trigdata->tg_updatedcols))</literal>.

trigdata->tg_updatedcols)</literal>.

</para>

<para>