Fix stats_ext test in 32 bit machines
Because tuple packing is different (because of the MAXALIGN difference), the expected costs of a seqscan is different. The commonly used trick of eliding costs in EXPLAIN output (COSTS OFF) would make the tests completely pointless. Instead, add an alternative expected file.
This commit is contained in:
Alvaro Herrera
parent
176cbc2a25
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6e9aaf6e47
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-- Generic extended statistics support
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-- Ensure stats are dropped sanely
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CREATE TABLE ab1 (a INTEGER, b INTEGER, c INTEGER);
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CREATE STATISTICS ab1_a_b_stats ON (a, b) FROM ab1;
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DROP STATISTICS ab1_a_b_stats;
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CREATE SCHEMA regress_schema_2;
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CREATE STATISTICS regress_schema_2.ab1_a_b_stats ON (a, b) FROM ab1;
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DROP STATISTICS regress_schema_2.ab1_a_b_stats;
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-- Ensure statistics are dropped when columns are
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CREATE STATISTICS ab1_b_c_stats ON (b, c) FROM ab1;
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CREATE STATISTICS ab1_a_b_c_stats ON (a, b, c) FROM ab1;
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CREATE STATISTICS ab1_a_b_stats ON (a, b) FROM ab1;
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ALTER TABLE ab1 DROP COLUMN a;
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\d ab1
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Table "public.ab1"
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Column | Type | Collation | Nullable | Default
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--------+---------+-----------+----------+---------
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b | integer | | |
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c | integer | | |
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Statistics:
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"public.ab1_b_c_stats" WITH (ndistinct) ON (b, c)
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DROP TABLE ab1;
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-- Ensure things work sanely with SET STATISTICS 0
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CREATE TABLE ab1 (a INTEGER, b INTEGER);
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ALTER TABLE ab1 ALTER a SET STATISTICS 0;
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INSERT INTO ab1 SELECT a, a%23 FROM generate_series(1, 1000) a;
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CREATE STATISTICS ab1_a_b_stats ON (a, b) FROM ab1;
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ANALYZE ab1;
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ERROR: extended statistics could not be collected for column "a" of relation public.ab1
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HINT: Consider ALTER TABLE "public"."ab1" ALTER "a" SET STATISTICS -1
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ALTER TABLE ab1 ALTER a SET STATISTICS -1;
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ANALYZE ab1;
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DROP TABLE ab1;
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-- n-distinct tests
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CREATE TABLE ndistinct (
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filler1 TEXT,
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filler2 NUMERIC,
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a INT,
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b INT,
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filler3 DATE,
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c INT,
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d INT
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);
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-- unknown column
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CREATE STATISTICS s10 ON (unknown_column) FROM ndistinct;
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ERROR: column "unknown_column" referenced in statistics does not exist
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-- single column
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CREATE STATISTICS s10 ON (a) FROM ndistinct;
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ERROR: statistics require at least 2 columns
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-- single column, duplicated
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CREATE STATISTICS s10 ON (a,a) FROM ndistinct;
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ERROR: duplicate column name in statistics definition
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-- two columns, one duplicated
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CREATE STATISTICS s10 ON (a, a, b) FROM ndistinct;
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ERROR: duplicate column name in statistics definition
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-- correct command
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CREATE STATISTICS s10 ON (a, b, c) FROM ndistinct;
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-- perfectly correlated groups
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INSERT INTO ndistinct (a, b, c, filler1)
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SELECT i/100, i/100, i/100, cash_words(i::money)
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FROM generate_series(1,10000) s(i);
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ANALYZE ndistinct;
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SELECT staenabled, standistinct
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FROM pg_statistic_ext WHERE starelid = 'ndistinct'::regclass;
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staenabled | standistinct
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------------+------------------------------------------------------------------------------------------------
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{d} | [{(b 3 4), 101.000000}, {(b 3 6), 101.000000}, {(b 4 6), 101.000000}, {(b 3 4 6), 101.000000}]
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(1 row)
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EXPLAIN (COSTS off)
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SELECT COUNT(*) FROM ndistinct GROUP BY a, b;
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QUERY PLAN
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-----------------------------
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HashAggregate
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Group Key: a, b
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-> Seq Scan on ndistinct
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(3 rows)
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EXPLAIN (COSTS off)
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SELECT COUNT(*) FROM ndistinct GROUP BY a, b, c;
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QUERY PLAN
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-----------------------------
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HashAggregate
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Group Key: a, b, c
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-> Seq Scan on ndistinct
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(3 rows)
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EXPLAIN (COSTS off)
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SELECT COUNT(*) FROM ndistinct GROUP BY a, b, c, d;
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QUERY PLAN
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-----------------------------
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HashAggregate
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Group Key: a, b, c, d
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-> Seq Scan on ndistinct
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(3 rows)
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TRUNCATE TABLE ndistinct;
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-- partially correlated groups
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INSERT INTO ndistinct (a, b, c)
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SELECT i/50, i/100, i/200 FROM generate_series(1,10000) s(i);
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ANALYZE ndistinct;
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SELECT staenabled, standistinct
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FROM pg_statistic_ext WHERE starelid = 'ndistinct'::regclass;
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staenabled | standistinct
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------------+------------------------------------------------------------------------------------------------
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{d} | [{(b 3 4), 201.000000}, {(b 3 6), 201.000000}, {(b 4 6), 101.000000}, {(b 3 4 6), 201.000000}]
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(1 row)
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EXPLAIN
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SELECT COUNT(*) FROM ndistinct GROUP BY a, b;
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QUERY PLAN
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---------------------------------------------------------------------
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HashAggregate (cost=225.00..227.01 rows=201 width=16)
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Group Key: a, b
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-> Seq Scan on ndistinct (cost=0.00..150.00 rows=10000 width=8)
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(3 rows)
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EXPLAIN
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SELECT COUNT(*) FROM ndistinct GROUP BY a, b, c;
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QUERY PLAN
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----------------------------------------------------------------------
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HashAggregate (cost=250.00..252.01 rows=201 width=20)
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Group Key: a, b, c
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-> Seq Scan on ndistinct (cost=0.00..150.00 rows=10000 width=12)
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(3 rows)
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EXPLAIN
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SELECT COUNT(*) FROM ndistinct GROUP BY a, b, c, d;
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QUERY PLAN
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----------------------------------------------------------------------
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HashAggregate (cost=275.00..285.00 rows=1000 width=24)
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Group Key: a, b, c, d
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-> Seq Scan on ndistinct (cost=0.00..150.00 rows=10000 width=16)
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(3 rows)
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EXPLAIN
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SELECT COUNT(*) FROM ndistinct GROUP BY b, c, d;
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QUERY PLAN
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----------------------------------------------------------------------
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HashAggregate (cost=250.00..260.00 rows=1000 width=20)
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Group Key: b, c, d
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-> Seq Scan on ndistinct (cost=0.00..150.00 rows=10000 width=12)
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(3 rows)
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EXPLAIN
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SELECT COUNT(*) FROM ndistinct GROUP BY a, d;
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QUERY PLAN
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---------------------------------------------------------------------
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HashAggregate (cost=225.00..235.00 rows=1000 width=16)
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Group Key: a, d
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-> Seq Scan on ndistinct (cost=0.00..150.00 rows=10000 width=8)
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(3 rows)
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DROP TABLE ndistinct;
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