In BuildTupleHashTable

    /* Limit initial table size request to not more than work_mem */
    nbuckets = Min(nbuckets, (long) ((work_mem * 1024L) / entrysize));

Is this a good idea?  If the caller of this code has no respect for
work_mem, they are still going to blow it out of the water.  Now we will
just do a bunch of hash-table splitting in the process.  That is only going
to add to the pain.


* false if it existed already.  ->additional_data in the new entry has

The field is just ->additional, not ->additional_data



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