Re: DBT-3 with SF=20 got failed

On Wed, Jun 10, 2015 at 10:57 PM, Kouhei Kaigai <kaigai@ak.jp.nec.com> wrote:
> The attached patch replaces this palloc0() by MemoryContextAllocHuge() + memset().
> Indeed, this hash table is constructed towards the relation with nrows=119994544,
> so, it is not strange even if hash-slot itself is larger than 1GB.

You forgot to attach the patch, I think.  It looks to me like the size
of a HashJoinTuple is going to be 16 bytes, so 1GB/16 = ~64 million.
That's a lot of buckets, but maybe not unreasonably many if you've got
enough memory.

-- 
Robert Haas
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