v6.3 snapshot core dump

this is the latest snapshot under linux 2.0.33

when I create a view with an aggregate such as count (with a group by
clause) I get a core dump.  The first three lines of the gdb backtrace
follows:

#0  0x80a9982 in ExecEvalAggreg (agg=0x820fa20, econtext=0x8213a48,
    isNull=0xbfffd6cf "") at execQual.c:201
#1  0x80ab271 in ExecEvalExpr (expression=0x820fa20, econtext=0x8213a48,
    isNull=0xbfffd6cf "", isDone=0xbfffd7c3 "\001\fZ\031\b\030K!\b")
    at execQual.c:1199
#2  0x80ab69b in ExecTargetList (targetlist=0x8213498, nodomains=2,
    targettype=0x8214990, values=0x8214b48, econtext=0x8213a48,
    isDone=0xbfffd7c3 "\001\fZ\031\b\030K!\b") at execQual.c:1484

code at point:

201             *isNull = econtext->ecxt_nulls[agg->aggno];

econtext->ecxt_nulls, is, well, a NULL pointer and hard to index :)
i'll take a look but I don't think I'll find it -- i notice that 6.2.1
pretends to make a view with aggregates but then it comes up empty
when selected.

--brett
let me know if you need more info