Group-By queries can fail with ora-32690 or
 [hash aggregation can't be done]
when operating on a large volume of data if hash group by
aggregation is used.
Also, it is possible for hash group-bys to over allocate memory beyond
the limit impose by the auto-memory manager.
Disable Hash group-by by setting
"_gby_hash_aggregation_enabled" to FALSE,
or by using a NO_USE_HASH_AGGREGATION hint
Fixed: 10.2.0.5, 220.127.116.11, 11.2, 10.2.0.3.P23, 10.2.0.4.P05