Damon Hart <dhcom (AT) sundial (DOT) com> writes:
Found it. The patch for 7.4.* is attached. It will appear in 7.4.2.

regards, tom lane

Index: src/backend/optimizer/plan/initsplan.c
================================================== =================
RCS file: /cvsroot/pgsql-server/src/backend/optimizer/plan/initsplan.c,v
retrieving revision 1.91.2.1
diff -c -r1.91.2.1 initsplan.c
*** src/backend/optimizer/plan/initsplan.c 5 Nov 2003 22:00:52 -0000 1.91.2.1
--- src/backend/optimizer/plan/initsplan.c 27 Feb 2004 21:38:40 -0000
***************
*** 768,778 ****
errmsg("equality operator for types %s and %s should be merge-joinable, but isn't",
format_type_be(ltype), format_type_be(rtype))));

clause = make_opclause(oprid(eq_operator), /* opno */
BOOLOID, /* opresulttype */
false, /* opretset */
! (Expr *) item1,
! (Expr *) item2);

ReleaseSysCache(eq_operator);

--- 768,783 ----
errmsg("equality operator for types %s and %s should be merge-joinable, but isn't",
format_type_be(ltype), format_type_be(rtype))));

+ /*
+ * Now we can build the new clause. Copy to ensure it shares no
+ * substructure with original (this is necessary in case there are
+ * subselects in there...)
+ */
clause = make_opclause(oprid(eq_operator), /* opno */
BOOLOID, /* opresulttype */
false, /* opretset */
! (Expr *) copyObject(item1),
! (Expr *) copyObject(item2));

ReleaseSysCache(eq_operator);


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