TODO updated:
* -Make NULL's come out at the beginning or end depending on the
ORDER BY direction (Tom)
> CVSROOT: /home/projects/pgsql/cvsroot
> Module name: pgsql
> Changes by: tgl@hub.org 01/06/02 15:01:53
>
> Modified files:
> src/include/utils: tuplesort.h
> src/backend/utils/sort: tuplesort.c
> src/backend/commands: analyze.c
>
> Log message:
> Tweak sorting so that nulls appear at the front of a descending sort
> (vs. at the end of a normal sort). This ensures that explicit sorts
> yield the same ordering as a btree index scan. To be really sure that
> that equivalence holds, we use the btree entries in pg_amop to decide
> whether we are looking at a '<' or '>' operator. For a sort operator
> that has no btree association, we put the nulls at the front if the
> operator is named '>' ... pretty grotty, but it does the right thing in
> simple ASC and DESC cases, and at least there's no possibility of getting
> a different answer depending on the plan type chosen.
>
>
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--
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