`pgv_list()` |`table(package text, name text)`

`pgv_stats()` |`table(package text, used_memory bigint)`

* "array argument can not be NULL"

* "could not identify a hash function for type %s"

* "could not identify a matching function for type %s"

* "function returning record called in context that cannot accept type record"

* "name "%s" is too long"

* "new record structure differs from variable "%s" structure"

* "package name can not be NULL"

* "record argument can not be NULL"

* "requested value type differs from variable "%s" key type"

* "searching for elements in multidimensional arrays is not supported"

* "there is a record in the variable "%s" with same key"

* "unrecognized package "%s""

* "unrecognized variable "%s""

* "variable "%s" requires %s value"

* "variable name can not be NULL"

It is easy to use functions to work with scalar variables:

</informaltable>

</sect3>

</sect2>

<sect2 id="pg-variables-error-messages">

<title>Error messages</title>

<itemizedlist spacing="compact">

<listitem>

<para>

&quot;array argument can not be NULL&quot;

</para>

</listitem>

<listitem>

<para>

&quot;could not identify a hash function for type %s&quot;

</para>

</listitem>

<listitem>

<para>

&quot;could not identify a matching function for type %s&quot;

</para>

</listitem>

<listitem>

<para>

&quot;function returning record called in context that cannot

accept type record&quot;

</para>

</listitem>

<listitem>

<para>

&quot;name &quot;%s&quot; is too long&quot;

</para>

</listitem>

<listitem>

<para>

&quot;new record structure differs from variable

&quot;%s&quot; structure&quot;

</para>

</listitem>

<listitem>

<para>

&quot;package name can not be NULL&quot;

</para>

</listitem>

<listitem>

<para>

&quot;record argument can not be NULL&quot;

</para>

</listitem>

<listitem>

<para>

&quot;requested value type differs from variable

&quot;%s&quot; key type&quot;

</para>

</listitem>

<listitem>

<para>

&quot;searching for elements in multidimensional arrays is not

supported&quot;

</para>

</listitem>

<listitem>

<para>

&quot;there is a record in the variable &quot;%s&quot; with

same key&quot;

</para>

</listitem>

<listitem>

<para>

&quot;unrecognized package &quot;%s&quot;&quot;

</para>

</listitem>

<listitem>

<para>

&quot;unrecognized variable &quot;%s&quot;&quot;

</para>

</listitem>

<listitem>

<para>

&quot;variable &quot;%s&quot; requires %s value&quot;

</para>

</listitem>

<listitem>

<para>

&quot;variable name can not be NULL&quot;

</para>

</listitem>

</itemizedlist>

</sect2>

<sect2 id="pg-variables-examples">

<title>Examples</title>

<para>