On Fri, Sep 6, 2013 at 4:53 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Kohei KaiGai <kaigai@kaigai.gr.jp> writes:
>> The attached patch adds a new plan node type; CustomPlan that enables
>> extensions to get control during query execution, via registered callbacks.
>
> TBH, I think this is really an exercise in building useless mechanism.
> I don't believe that any actually *interesting* new types of plan node can
> be inserted into a query plan without invasive changes to the planner, and
> so it's a bit pointless to set up hooks whereby you can avoid touching any
> source code in the executor.
I find this a somewhat depressing response. Didn't we discuss this
exact design at the developer meeting in Ottawa? I thought it sounded
reasonable to you then, or at least I don't remember you panning it.
--
Robert Haas
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