Обсуждение: pgsql: Doc: discourage use of partial indexes for poor-man's-partitioni

Doc: discourage use of partial indexes for poor-man's-partitioning.

Creating a bunch of non-overlapping partial indexes is generally
a bad idea, so add an example saying not to do that.

Back-patch to v10.  Before that, the alternative of using (real)
partitioning wasn't available, so that the tradeoff isn't quite
so clear cut.

Discussion: https://postgr.es/m/CAKVFrvFY-f7kgwMRMiPLbPYMmgjc8Y2jjUGK_Y0HVcYAmU6ymg@mail.gmail.com

Branch
------
REL_10_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/1de4a823f9dea3bdc2dba2fe0b9b90c06cfd6fbb

Modified Files
--------------
doc/src/sgml/indices.sgml | 48 +++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 46 insertions(+), 2 deletions(-)