Re: [COMMITTERS] pgsql: Fix "element <@ range" cost estimation.

Heikki Linnakangas <heikki.linnakangas@iki.fi> wrote:

> Fix "element <@ range" cost estimation.
>
> The statistics-based cost estimation patch for range types broke that, by
> incorrectly assuming that the left operand of all range oeprators is a
> range. That lead to a "type x is not a range type" error. Because it
> took so long for anyone to notice, add a regression test for that case.
>
> We still don't do proper statistics-based cost estimation for that, so you
> just get a default constant estimate. We should look into implementing that,
> but this patch at least fixes the regression.

Something is still wrong.  When I run `make check-world` everything
passes, but `make installcheck-world` on a fresh initdb with
default configuration yields this:

*** /home/kgrittn/pg/master/src/test/regress/expected/rangetypes.out    2013-03-21 09:17:39.445690793 -0500
--- /home/kgrittn/pg/master/src/test/regress/results/rangetypes.out 2013-03-21 10:13:20.201683022 -0500
***************
*** 1048,1058 ****
  create index test_range_elem_idx on test_range_elem (i);
  insert into test_range_elem select i from generate_series(1,100) i;
  select count(*) from test_range_elem where i <@ int4range(10,50);
!  count
! -------
!     40
! (1 row)
!
  drop table test_range_elem;
  --
  -- Btree_gist is not included by default, so to test exclusion
--- 1048,1054 ----
  create index test_range_elem_idx on test_range_elem (i);
  insert into test_range_elem select i from generate_series(1,100) i;
  select count(*) from test_range_elem where i <@ int4range(10,50);
! ERROR:  type 23 is not a range type
  drop table test_range_elem;
  --
  -- Btree_gist is not included by default, so to test exclusion

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--
Kevin Grittner
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