On Fri, Sep 11, 2015 at 2:01 AM, Kouhei Kaigai <kai...@ak.jp.nec.com> wrote:
> If a callback on ForeignRecheck processes EPQ rechecks, the core PostgreSQL
> don't need to know what expression was pushed down and how does it kept in
> the private field (fdw_exprs). Only FDW driver knows which private field is
> the expression node that was pushed down to the remote side. It shall not be
> an interface contract.

I agree.  It seems needless to involve the core code here.

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

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