Re: no partition pruning when partitioning using array type

On 2018-Jul-10, Alvaro Herrera wrote:

> alvherre=# explain update p set a = a || a where a = '{1}';
>                         QUERY PLAN                        
> ──────────────────────────────────────────────────────────
>  Update on p  (cost=0.00..54.03 rows=14 width=38)
>    Update on p1
>    Update on p2
>    ->  Seq Scan on p1  (cost=0.00..27.02 rows=7 width=38)
>          Filter: (a = '{1}'::integer[])
>    ->  Seq Scan on p2  (cost=0.00..27.02 rows=7 width=38)
>          Filter: (a = '{1}'::integer[])
> (7 filas)
> 
> Because UPDATE uses the predtest.c prune code, not partprune.  So it's
> not just some ruleutils beautification.

I added this test, modified some comments, and pushed.

Thanks for the patch.

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