idbpm inside of aggregate never returns

Somewhere along the line, working_tpch1_compareLogOnly/misc/pseudoColumns2.sql started locking up. The query

select count(distinct idbPm(l_orderkey)*10000000 + idbExtentRelativeRid(l_orderkey)) from lineitem;

Is the culprit. It can be reduced to

select max(idbPm(l_orderkey)) from lineitem;

and still cause the problem.

However, if we shoot for a smaller dataset:

select count(distinct idbPm(r_regionkey)) from region;

All is well.

This is a regression from 1.4.4