I think this will need some rework to deal with the addition of
GetNamedDSA() and GetNamedDSHash() [0]. We probably want to add a "type"
column to show whether the entry is for a DSM, DSA, or dshash table. And
for DSAs and dshash tables, we probably want to use dsa_get_total_size()
for the "size" column.
[0] https://postgr.es/m/flat/aEC8HGy2tRQjZg_8@nathan
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nathan