/*
-    * We use UNION ALL rather than UNION; this might sometimes result in
-    * duplicate entries in the OID list, but we don't care.
+    * this might sometimes result in duplicate entries in the OID list,
+    * but we don't care.
      */

This looks totally incoherent.  You've removed the thing to which the
word "this" referred and replaced it with nothing.

Oops.

    /*
     * The loop below runs multiple SELECTs might sometimes result in
     * duplicate entries in the OID list, but we don't care.
     */

looks reasonable?

--
Teodor Sigaev                                   E-mail: teo...@sigaev.ru
                                                   WWW: http://www.sigaev.ru/


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