"David G. Johnston" <david.g.johnston@xxxxxxxxx> writes:
> On Thu, Oct 19, 2017 at 12:14 PM, Tom Lane <tgl@xxxxxxxxxxxxx> wrote:
>> FROM products,
>> (values ('red widget'::text)) consts(target)
>> WHERE similarity(target, item_name) > 0.25
>> ORDER BY target <<-> item_name
>>
>> PG 9.5 and up will flatten out cases like this to be exactly what you
>> wrote out longhand.
> Does it matter if the values expression is embedded in a CTE?
Yes, CTEs are optimization fences ...
regards, tom lane
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