Additional size of hash table is alway zero for hash aggregates

[Pengzhou Tang]

Hi hacker,

When reading the grouping sets codes, I find that the additional size of
the hash table for hash aggregates is always zero, this seems to be
incorrect to me, attached a patch to fix it, please help to check.

Thanks,
Pengzhou

0001-Set-numtrans-correctly-when-building-hash-aggregate-.patch
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