"incompatibilities" section of the release notes.
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<appendix id="release">
</para>
</listitem>
+ <listitem>
+ <para>
+ The API for user-defined GiST indexes has been changed. The
+ Union and PickSplit methods are now passed a pointer to a
+ special <structname>GistEntryVector</structname> structure,
+ rather than a <type>bytea</type>.
+ </para>
+ </listitem>
+
</itemizedlist>
</para>
</sect2>