self-hosted/postgis
self-hosted/postgis
1
0
Fork 0
mirror of https://git.osgeo.org/gitea/postgis/postgis synced 2024-10-24 17:12:35 +00:00
Code Issues Packages Projects Releases Wiki Activity

#2101, add some doco in the .sql.in.c file on the _postgis_* stats info functions.

Browse source 
git-svn-id: http://svn.osgeo.org/postgis/trunk@10806 b70326c6-7e19-0410-871a-916f4a2858ee
This commit is contained in:
Paul Ramsey 2012-12-06 17:56:37 +00:00
parent d9eb8fd557
commit 9d107d92e0
1 changed files with 10 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
postgis/postgis.sql.in.c
View file

@ -432,18 +432,28 @@ CREATE OR REPLACE FUNCTION geometry_gist_joinsel_2d(internal, oid, internal, sma
-----------------------------------------------------------------------------
-- Availability: 2.1.0
-- Given a table, column and query geometry, returns the estimate of what proportion
-- of the table would be returned by a query using the &&/&&& operators. The mode
-- changes whether the estimate is in x/y only or in all available dimensions.
CREATE OR REPLACE FUNCTION _postgis_selectivity(tbl regclass, att_name text, geom geometry, mode text default '2')
RETURNS float8
AS 'MODULE_PATHNAME', '_postgis_gserialized_sel'
LANGUAGE 'c' STRICT;
-- Availability: 2.1.0
-- Given a two tables and columns, returns estimate of the proportion of rows
-- a &&/&&& join will return relative to the number of rows an unconstrained
-- table join would return. Mode flips result between evaluation in x/y only
-- and evaluation in all available dimensions.
CREATE OR REPLACE FUNCTION _postgis_join_selectivity(regclass, text, regclass, text, text default '2')
RETURNS float8
AS 'MODULE_PATHNAME', '_postgis_gserialized_joinsel'
LANGUAGE 'c' STRICT;
-- Availability: 2.1.0
-- Given a table and a column, returns the statistics information stored by
-- PostgreSQL, in a JSON text form. Mode determines whether the 2D statistics
-- or the ND statistics are returned.
CREATE OR REPLACE FUNCTION _postgis_stats(tbl regclass, att_name text, text default '2')
RETURNS text
AS 'MODULE_PATHNAME', '_postgis_gserialized_stats'