bb6e270ae3
If the original IN operator is cross-type, for example int8 = int4, we need to use int4 < int4 to sort the inner data and int4 = int4 to unique-ify it. We got the first part of that right, but tried to use the original IN operator for the equality checks. Per bug #5472 from Vlad Romascanu. Backpatch to 8.4, where the bug was introduced by the patch that unified SortClause and GroupClause. I was able to take out a whole lot of on-the-fly calls of get_equality_op_for_ordering_op(), but failed to realize that I needed to put one back in right here :-(
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