@ -5,24 +5,49 @@
SET max_parallel_workers = 0;
SET max_parallel_workers_per_gather = 0;
SET work_mem = '128kB';
-- Verify failures
CREATE STATISTICS tst;
ERROR: syntax error at or near ";"
LINE 1: CREATE STATISTICS tst;
^
CREATE STATISTICS tst ON a, b;
ERROR: syntax error at or near ";"
LINE 1: CREATE STATISTICS tst ON a, b;
^
CREATE STATISTICS tst FROM sometab;
ERROR: syntax error at or near "FROM"
LINE 1: CREATE STATISTICS tst FROM sometab;
^
CREATE STATISTICS tst ON a, b FROM nonexistant;
ERROR: relation "nonexistant" does not exist
CREATE STATISTICS tst ON a, b FROM pg_class;
ERROR: column "a" referenced in statistics does not exist
CREATE STATISTICS tst ON relname, relname, relnatts FROM pg_class;
ERROR: duplicate column name in statistics definition
CREATE STATISTICS tst ON relnatts + relpages FROM pg_class;
ERROR: only simple column references are allowed in CREATE STATISTICS
CREATE STATISTICS tst ON (relpages, reltuples) FROM pg_class;
ERROR: only simple column references are allowed in CREATE STATISTICS
CREATE STATISTICS tst (unrecognized) ON relname, relnatts FROM pg_class;
ERROR: unrecognized statistics type "unrecognized"
-- Ensure stats are dropped sanely
CREATE TABLE ab1 (a INTEGER, b INTEGER, c INTEGER);
CREATE STATISTICS ab1_a_b_stats ON (a, b) FROM ab1;
CREATE STATISTICS ab1_a_b_stats ON a, b FROM ab1;
DROP STATISTICS ab1_a_b_stats;
CREATE SCHEMA regress_schema_2;
CREATE STATISTICS regress_schema_2.ab1_a_b_stats ON (a, b) FROM ab1;
CREATE STATISTICS regress_schema_2.ab1_a_b_stats ON a, b FROM ab1;
-- Let's also verify the pg_get_statisticsextdef output looks sane.
SELECT pg_get_statisticsextdef(oid) FROM pg_statistic_ext WHERE stxname = 'ab1_a_b_stats';
pg_get_statisticsextdef
---------------------------------------------------------------------
CREATE STATISTICS regress_schema_2.ab1_a_b_stats ON (a, b) FROM ab1
pg_get_statisticsextdef
-------------------------------------------------------------------
CREATE STATISTICS regress_schema_2.ab1_a_b_stats ON a, b FROM ab1
(1 row)
DROP STATISTICS regress_schema_2.ab1_a_b_stats;
-- Ensure statistics are dropped when columns are
CREATE STATISTICS ab1_b_c_stats ON (b, c) FROM ab1;
CREATE STATISTICS ab1_a_b_c_stats ON (a, b, c) FROM ab1;
CREATE STATISTICS ab1_a_b_stats ON (a, b) FROM ab1;
CREATE STATISTICS ab1_b_c_stats ON b, c FROM ab1;
CREATE STATISTICS ab1_a_b_c_stats ON a, b, c FROM ab1;
CREATE STATISTICS ab1_a_b_stats ON a, b FROM ab1;
ALTER TABLE ab1 DROP COLUMN a;
\d ab1
Table "public.ab1"
@ -31,14 +56,14 @@ ALTER TABLE ab1 DROP COLUMN a;
b | integer | | |
c | integer | | |
Statistics:
"public.ab1_b_c_stats" WITH (ndistinct, dependencies) ON (b, c)
"public"."ab1_b_c_stats" (ndistinct, dependencies) ON b, c FROM ab1
DROP TABLE ab1;
-- Ensure things work sanely with SET STATISTICS 0
CREATE TABLE ab1 (a INTEGER, b INTEGER);
ALTER TABLE ab1 ALTER a SET STATISTICS 0;
INSERT INTO ab1 SELECT a, a%23 FROM generate_series(1, 1000) a;
CREATE STATISTICS ab1_a_b_stats ON ( a, b) FROM ab1;
CREATE STATISTICS ab1_a_b_stats ON a, b FROM ab1;
ANALYZE ab1;
WARNING: extended statistics "public.ab1_a_b_stats" could not be collected for relation public.ab1
ALTER TABLE ab1 ALTER a SET STATISTICS -1;
@ -60,24 +85,24 @@ CREATE SERVER extstats_dummy_srv FOREIGN DATA WRAPPER extstats_dummy_fdw;
CREATE FOREIGN TABLE tststats.f (a int, b int, c text) SERVER extstats_dummy_srv;
CREATE TABLE tststats.pt (a int, b int, c text) PARTITION BY RANGE (a, b);
CREATE TABLE tststats.pt1 PARTITION OF tststats.pt FOR VALUES FROM (-10, -10) TO (10, 10);
CREATE STATISTICS tststats.s1 ON ( a, b) FROM tststats.t;
CREATE STATISTICS tststats.s2 ON ( a, b) FROM tststats.ti;
CREATE STATISTICS tststats.s1 ON a, b FROM tststats.t;
CREATE STATISTICS tststats.s2 ON a, b FROM tststats.ti;
ERROR: relation "ti" is not a table, foreign table, or materialized view
CREATE STATISTICS tststats.s3 ON ( a, b) FROM tststats.s;
CREATE STATISTICS tststats.s3 ON a, b FROM tststats.s;
ERROR: relation "s" is not a table, foreign table, or materialized view
CREATE STATISTICS tststats.s4 ON ( a, b) FROM tststats.v;
CREATE STATISTICS tststats.s4 ON a, b FROM tststats.v;
ERROR: relation "v" is not a table, foreign table, or materialized view
CREATE STATISTICS tststats.s5 ON ( a, b) FROM tststats.mv;
CREATE STATISTICS tststats.s6 ON ( a, b) FROM tststats.ty;
CREATE STATISTICS tststats.s5 ON a, b FROM tststats.mv;
CREATE STATISTICS tststats.s6 ON a, b FROM tststats.ty;
ERROR: relation "ty" is not a table, foreign table, or materialized view
CREATE STATISTICS tststats.s7 ON ( a, b) FROM tststats.f;
CREATE STATISTICS tststats.s8 ON ( a, b) FROM tststats.pt;
CREATE STATISTICS tststats.s9 ON ( a, b) FROM tststats.pt1;
CREATE STATISTICS tststats.s7 ON a, b FROM tststats.f;
CREATE STATISTICS tststats.s8 ON a, b FROM tststats.pt;
CREATE STATISTICS tststats.s9 ON a, b FROM tststats.pt1;
DO $$
DECLARE
relname text := reltoastrelid::regclass FROM pg_class WHERE oid = 'tststats.t'::regclass;
BEGIN
EXECUTE 'CREATE STATISTICS tststats.s10 ON ( a, b) FROM ' || relname;
EXECUTE 'CREATE STATISTICS tststats.s10 ON a, b FROM ' || relname;
EXCEPTION WHEN wrong_object_type THEN
RAISE NOTICE 'stats on toast table not created';
END;
@ -158,20 +183,8 @@ EXPLAIN (COSTS off)
-> Seq Scan on ndistinct
(5 rows)
-- unknown column
CREATE STATISTICS s10 ON (unknown_column) FROM ndistinct;
ERROR: column "unknown_column" referenced in statistics does not exist
-- single column
CREATE STATISTICS s10 ON (a) FROM ndistinct;
ERROR: extended statistics require at least 2 columns
-- single column, duplicated
CREATE STATISTICS s10 ON (a,a) FROM ndistinct;
ERROR: duplicate column name in statistics definition
-- two columns, one duplicated
CREATE STATISTICS s10 ON (a, a, b) FROM ndistinct;
ERROR: duplicate column name in statistics definition
-- correct command
CREATE STATISTICS s10 ON ( a, b, c) FROM ndistinct;
CREATE STATISTICS s10 ON a, b, c FROM ndistinct;
ANALYZE ndistinct;
SELECT stxkind, stxndistinct
FROM pg_statistic_ext WHERE stxrelid = 'ndistinct'::regclass;
@ -352,7 +365,6 @@ EXPLAIN (COSTS off)
-> Seq Scan on ndistinct
(3 rows)
DROP TABLE ndistinct;
-- functional dependencies tests
CREATE TABLE functional_dependencies (
filler1 TEXT,
@ -389,7 +401,7 @@ EXPLAIN (COSTS OFF)
(2 rows)
-- create statistics
CREATE STATISTICS func_deps_stat WITH (dependencies) ON ( a, b, c) FROM functional_dependencies;
CREATE STATISTICS func_deps_stat (dependencies) ON a, b, c FROM functional_dependencies;
ANALYZE functional_dependencies;
EXPLAIN (COSTS OFF)
SELECT * FROM functional_dependencies WHERE a = 1 AND b = '1';
@ -432,7 +444,7 @@ EXPLAIN (COSTS OFF)
(2 rows)
-- create statistics
CREATE STATISTICS func_deps_stat WITH (dependencies) ON ( a, b, c) FROM functional_dependencies;
CREATE STATISTICS func_deps_stat (dependencies) ON a, b, c FROM functional_dependencies;
ANALYZE functional_dependencies;
EXPLAIN (COSTS OFF)
SELECT * FROM functional_dependencies WHERE a = 1 AND b = '1';
@ -456,4 +468,3 @@ EXPLAIN (COSTS OFF)
(5 rows)
RESET random_page_cost;
DROP TABLE functional_dependencies;
Alvaro Herrera
9 years ago