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<para>
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The catalog <structname>pg_attrdef</structname> stores column default
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- values. The main information about columns is stored in
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- <link linkend="catalog-pg-attribute"><structname>pg_attribute</structname></link>.
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- Only columns for which a default value has been explicitly set will have
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- an entry here.
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+ expressions and generation expressions. The main information about columns
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+ is stored in <link
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+ linkend="catalog-pg-attribute"><structname>pg_attribute</structname></link>.
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+ Only columns for which a default expression or generation expression has
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+ been explicitly set will have an entry here.
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</para>
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<table>
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<structfield>adbin</structfield> <type>pg_node_tree</type>
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</para>
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<para>
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- The column default value , in <function>nodeToString()</function>
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+ The column default or generation expression , in <function>nodeToString()</function>
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representation. Use <literal>pg_get_expr(adbin, adrelid)</literal> to
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convert it to an SQL expression.
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</para></entry>
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