Re: Speeding up INSERTs and UPDATEs to partitioned tables

On 2018-Nov-16, Alvaro Herrera wrote:

> One thing I don't quite like is the inconsistency in handling memory
> context switches in the various function allocating stuff.  It seems
> rather haphazard.  I'd rather have a memcxt member in
> PartitionTupleRouting, which is set when the struct is created, and then
> have all the other functions allocating stuff use that one.

So while researching this I finally realized that there was a "lexical
disconnect" between setting a ResultRelInfo's ri_PartitionInfo
struct/pointer and adding it to the PartitionTupleRoute arrays.
However, if you think about it, these things are one and the same, so we
don't need to do them separately; just merge the new function I wrote
into the existing ExecInitRoutingInfo().  Patch attached.

(This version also rebases across Andres' recent conflicting
TupleTableSlot changes.)

I'll now see about the commit message and push shortly.

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
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