Re: [HACKERS] Hash Functions

On Fri, May 12, 2017 at 7:36 PM, David Fetter <david@fetter.org> wrote:
> On Fri, May 12, 2017 at 06:38:55PM -0400, Peter Eisentraut wrote:
>> On 5/12/17 18:13, Alvaro Herrera wrote:
>> > I think for logical replication the tuple should appear as being in the
>> > parent table, not the partition.  No?
>>
>> Logical replication replicates base table to base table.  How those
>> tables are tied together into a partitioned table or an inheritance tree
>> is up to the system catalogs on each side.
>
> This seems like a totally reasonable approach to pg_dump, especially
> in light of the fact that logical replication already (and quite
> reasonably) does it this way.  Hard work has been done to make
> tuple-routing cheap, and this is one of the payoffs.

Cheap isn't free, though.  It's got a double-digit percentage overhead
rather than a large-multiple-of-the-runtime overhead as triggers do,
but people still won't want to pay it unnecessarily, I think.

-- 
Robert Haas
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