On Fri, May 19, 2017 at 6:07 AM, Ashutosh Bapat
<ashutosh.ba...@enterprisedb.com> wrote:
> We still have the same copy shared across multiple append paths and
> set_plan_refs would change change it underneath those. May not be a
> problem right now but may be a problem in the future.

I agree.  I think it's better for the path-creation functions to copy
the list, so that there is no surprising sharing of substructure.
set_plan_refs() obviously expects this data to be unshared, and this
seems like the best way to ensure that's true in all cases.

Committed that way.

Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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