mirror of
https://git.osgeo.org/gitea/postgis/postgis
synced 2024-10-25 01:22:47 +00:00
fab6c1d1aa
git-svn-id: http://svn.osgeo.org/postgis/trunk@10800 b70326c6-7e19-0410-871a-916f4a2858ee
53 lines
2.2 KiB
SQL
53 lines
2.2 KiB
SQL
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-- Check for error messages
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create table no_stats ( g geometry, id integer );
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create table no_stats_join ( g geometry, id integer );
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select _postgis_selectivity('no_stats','g', 'LINESTRING(0 0, 1 1)');
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select _postgis_stats('no_stats','g');
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select _postgis_join_selectivity('no_stats', 'g', 'no_stats_join', 'g');
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insert into no_stats (g, id) values ('POINT(0 0)', 0);
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analyze no_stats;
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select _postgis_join_selectivity('no_stats', 'g', 'no_stats_join', 'g');
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drop table no_stats;
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drop table no_stats_join;
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-- Table with uniformly variable density, highest at 1,1, lowest at 10,10
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create table regular_overdots as
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with
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ij as ( select i, j from generate_series(1, 10) i, generate_series(1, 10) j),
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iijj as (select generate_series(1, i) as a, generate_series(1, j) b from ij)
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select st_makepoint(a, b) as g from iijj;
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-- Generate the stats
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analyze regular_overdots;
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-- Baseline info
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select 'selectivity_00', count(*) from regular_overdots;
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-- First test
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select 'selectivity_01', count(*) from regular_overdots where g && 'LINESTRING(0 0, 11 3.5)';
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select 'selectivity_02', 'actual', round(1068.0/2127.0,3);
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select 'selectivity_03', 'estimated', round(_postgis_selectivity('regular_overdots','g','LINESTRING(0 0, 11 3.5)')::numeric,3);
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-- Second test
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select 'selectivity_04', count(*) from regular_overdots where g && 'LINESTRING(5.5 5.5, 11 11)';
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select 'selectivity_05', 'actual', round(161.0/2127.0,3);
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select 'selectivity_06', 'estimated', round(_postgis_selectivity('regular_overdots','g','LINESTRING(5.5 5.5, 11 11)')::numeric,3);
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-- Third test
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select 'selectivity_07', count(*) from regular_overdots where g && 'LINESTRING(1.5 1.5, 2.5 2.5)';
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select 'selectivity_08', 'actual', round(81.0/2127.0,3);
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select 'selectivity_09', 'estimated', round(_postgis_selectivity('regular_overdots','g','LINESTRING(1.5 1.5, 2.5 2.5)')::numeric,3);
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-- Fourth test
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select 'selectivity_10', 'actual', 0;
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select 'selectivity_09', 'estimated', _postgis_selectivity('regular_overdots','g','LINESTRING(11 11, 12 12)');
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-- Fifth test
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select 'selectivity_10', 'actual', 1;
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select 'selectivity_09', 'estimated', _postgis_selectivity('regular_overdots','g','LINESTRING(0 0, 12 12)');
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-- Clean
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drop table if exists regular_overdots;
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