On 24 March 2018 at 14:35, Andres Freund <and...@anarazel.de> wrote:
> How long does planning take if you repeat this? I wonder if a good chunk
> of those 1.8s is initial loading of plv8.

Maybe, but it also could be the execution of the function, after all,
the planner does invoke immutable functions:

# explain verbose select lower('TEST');
                QUERY PLAN
 Result  (cost=0.00..0.01 rows=1 width=32)
   Output: 'test'::text
(2 rows)

Would be interesting to see what changes without the IMMUTABLE flag.

 David Rowley                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services

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