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timescaledb/test/expected/sql_query_results_optimized.out
Matvey Arye a78f1570ba Remove dblink dependency. 
The dblink extension is blacklisted by some cloud-hosting providers and
is an unnecessary dependency for single-node operation. Since we don't plan
to use dblink to implement clustering this PR removes the dependency.
2017-04-12 11:14:54 -04:00

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\o /dev/null
\ir include/create_single_db.sql
SET client_min_messages = WARNING;
DROP DATABASE IF EXISTS single;
SET client_min_messages = NOTICE;
CREATE DATABASE single;
\c single
CREATE EXTENSION IF NOT EXISTS timescaledb CASCADE;
psql:include/create_single_db.sql:7: NOTICE: installing required extension "postgres_fdw"
SELECT setup_timescaledb(hostname => 'fakehost'); -- fakehost makes sure there is no network connection
\o
\ir include/sql_query_results.sql
CREATE TABLE PUBLIC.hyper_1 (
time TIMESTAMP NOT NULL,
series_0 DOUBLE PRECISION NULL,
series_1 DOUBLE PRECISION NULL,
series_2 DOUBLE PRECISION NULL
);
CREATE INDEX "time_plain" ON PUBLIC.hyper_1 (time DESC, series_0);
SELECT * FROM create_hypertable('"public"."hyper_1"'::regclass, 'time'::name, number_partitions => 1, chunk_size_bytes=>10000);
create_hypertable
-------------------
(1 row)
INSERT INTO hyper_1 SELECT to_timestamp(ser), ser, ser+10000, sqrt(ser::numeric) FROM generate_series(0,10000) ser;
INSERT INTO hyper_1 SELECT to_timestamp(ser), ser, ser+10000, sqrt(ser::numeric) FROM generate_series(10001,20000) ser;
--non-aggregates use MergeAppend in both optimized and non-optimized
EXPLAIN (costs off) SELECT * FROM hyper_1 ORDER BY "time" DESC limit 2;
QUERY PLAN
--------------------------------------------------------------------
Limit
-> Merge Append
Sort Key: _hyper_1_0_replica."time" DESC
-> Sort
Sort Key: _hyper_1_0_replica."time" DESC
-> Seq Scan on _hyper_1_0_replica
-> Sort
Sort Key: _hyper_1_1_0_partition."time" DESC
-> Seq Scan on _hyper_1_1_0_partition
-> Index Scan using "1-time_plain" on _hyper_1_1_0_1_data
-> Index Scan using "2-time_plain" on _hyper_1_1_0_2_data
(11 rows)
SELECT * FROM hyper_1 ORDER BY "time" DESC limit 2;
time | series_0 | series_1 | series_2
--------------------------+----------+----------+------------------
Wed Dec 31 21:33:20 1969 | 20000 | 30000 | 141.42135623731
Wed Dec 31 21:33:19 1969 | 19999 | 29999 | 141.417820659208
(2 rows)
--aggregates use MergeAppend only in optimized
EXPLAIN (costs off) SELECT date_trunc('minute', time) t, avg(series_0), min(series_1), avg(series_2) FROM hyper_1 GROUP BY t ORDER BY t DESC limit 2;
QUERY PLAN
------------------------------------------------------------------------------------------------------
Limit
-> GroupAggregate
Group Key: (date_trunc('minute'::text, _hyper_1_0_replica."time"))
-> Result
-> Merge Append
Sort Key: (date_trunc('minute'::text, _hyper_1_0_replica."time")) DESC
-> Sort
Sort Key: (date_trunc('minute'::text, _hyper_1_0_replica."time")) DESC
-> Seq Scan on _hyper_1_0_replica
-> Sort
Sort Key: (date_trunc('minute'::text, _hyper_1_1_0_partition."time")) DESC
-> Seq Scan on _hyper_1_1_0_partition
-> Index Scan using "1-time_plain" on _hyper_1_1_0_1_data
-> Index Scan using "2-time_plain" on _hyper_1_1_0_2_data
(14 rows)
--the minute and second results should be diff
SELECT date_trunc('minute', time) t, avg(series_0), min(series_1), avg(series_2) FROM hyper_1 GROUP BY t ORDER BY t DESC limit 2;
t | avg | min | avg
--------------------------+---------+-------+------------------
Wed Dec 31 21:33:00 1969 | 19990 | 29980 | 141.385994856058
Wed Dec 31 21:32:00 1969 | 19949.5 | 29920 | 141.242685621416
(2 rows)
SELECT date_trunc('second', time) t, avg(series_0), min(series_1), avg(series_2) FROM hyper_1 GROUP BY t ORDER BY t DESC limit 2;
t | avg | min | avg
--------------------------+-------+-------+------------------
Wed Dec 31 21:33:20 1969 | 20000 | 30000 | 141.42135623731
Wed Dec 31 21:33:19 1969 | 19999 | 29999 | 141.417820659208
(2 rows)
--test that when index on time used by constraint, still works correctly
EXPLAIN (costs off)
SELECT date_trunc('minute', time) t, avg(series_0), min(series_1), avg(series_2)
FROM hyper_1
WHERE time < to_timestamp(900)
GROUP BY t
ORDER BY t DESC
LIMIT 2;
QUERY PLAN
-------------------------------------------------------------------------------------------------------------
Limit
-> GroupAggregate
Group Key: (date_trunc('minute'::text, _hyper_1_0_replica."time"))
-> Result
-> Merge Append
Sort Key: (date_trunc('minute'::text, _hyper_1_0_replica."time")) DESC
-> Sort
Sort Key: (date_trunc('minute'::text, _hyper_1_0_replica."time")) DESC
-> Seq Scan on _hyper_1_0_replica
Filter: ("time" < 'Wed Dec 31 16:15:00 1969 PST'::timestamp with time zone)
-> Sort
Sort Key: (date_trunc('minute'::text, _hyper_1_1_0_partition."time")) DESC
-> Seq Scan on _hyper_1_1_0_partition
Filter: ("time" < 'Wed Dec 31 16:15:00 1969 PST'::timestamp with time zone)
-> Index Scan using "1-time_plain" on _hyper_1_1_0_1_data
Index Cond: ("time" < 'Wed Dec 31 16:15:00 1969 PST'::timestamp with time zone)
-> Index Scan using "2-time_plain" on _hyper_1_1_0_2_data
Index Cond: ("time" < 'Wed Dec 31 16:15:00 1969 PST'::timestamp with time zone)
(18 rows)
SELECT date_trunc('minute', time) t, avg(series_0), min(series_1), avg(series_2)
FROM hyper_1
WHERE time < to_timestamp(900)
GROUP BY t
ORDER BY t DESC
LIMIT 2;
t | avg | min | avg
--------------------------+-------+-------+------------------
Wed Dec 31 16:14:00 1969 | 869.5 | 10840 | 29.4858228711055
Wed Dec 31 16:13:00 1969 | 809.5 | 10780 | 28.4500853206775
(2 rows)
--test that still works with an expression index on data_trunc.
DROP INDEX "time_plain";
CREATE INDEX "time_trunc" ON PUBLIC.hyper_1 (date_trunc('minute', time));
EXPLAIN (costs off) SELECT date_trunc('minute', time) t, avg(series_0), min(series_1), avg(series_2) FROM hyper_1 GROUP BY t ORDER BY t DESC limit 2;
QUERY PLAN
------------------------------------------------------------------------------------------------------
Limit
-> GroupAggregate
Group Key: (date_trunc('minute'::text, _hyper_1_0_replica."time"))
-> Result
-> Merge Append
Sort Key: (date_trunc('minute'::text, _hyper_1_0_replica."time")) DESC
-> Sort
Sort Key: (date_trunc('minute'::text, _hyper_1_0_replica."time")) DESC
-> Seq Scan on _hyper_1_0_replica
-> Sort
Sort Key: (date_trunc('minute'::text, _hyper_1_1_0_partition."time")) DESC
-> Seq Scan on _hyper_1_1_0_partition
-> Index Scan Backward using "3-time_trunc" on _hyper_1_1_0_1_data
-> Index Scan Backward using "4-time_trunc" on _hyper_1_1_0_2_data
(14 rows)
SELECT date_trunc('minute', time) t, avg(series_0), min(series_1), avg(series_2) FROM hyper_1 GROUP BY t ORDER BY t DESC limit 2;
t | avg | min | avg
--------------------------+---------+-------+------------------
Wed Dec 31 21:33:00 1969 | 19990 | 29980 | 141.385994856058
Wed Dec 31 21:32:00 1969 | 19949.5 | 29920 | 141.242685621416
(2 rows)
--test that works with both indexes
CREATE INDEX "time_plain" ON PUBLIC.hyper_1 (time DESC, series_0);
EXPLAIN (costs off) SELECT date_trunc('minute', time) t, avg(series_0), min(series_1), avg(series_2) FROM hyper_1 GROUP BY t ORDER BY t DESC limit 2;
QUERY PLAN
------------------------------------------------------------------------------------------------------
Limit
-> GroupAggregate
Group Key: (date_trunc('minute'::text, _hyper_1_0_replica."time"))
-> Result
-> Merge Append
Sort Key: (date_trunc('minute'::text, _hyper_1_0_replica."time")) DESC
-> Sort
Sort Key: (date_trunc('minute'::text, _hyper_1_0_replica."time")) DESC
-> Seq Scan on _hyper_1_0_replica
-> Sort
Sort Key: (date_trunc('minute'::text, _hyper_1_1_0_partition."time")) DESC
-> Seq Scan on _hyper_1_1_0_partition
-> Index Scan Backward using "3-time_trunc" on _hyper_1_1_0_1_data
-> Index Scan Backward using "4-time_trunc" on _hyper_1_1_0_2_data
(14 rows)
SELECT date_trunc('minute', time) t, avg(series_0), min(series_1), avg(series_2) FROM hyper_1 GROUP BY t ORDER BY t DESC limit 2;
t | avg | min | avg
--------------------------+---------+-------+------------------
Wed Dec 31 21:33:00 1969 | 19990 | 29980 | 141.385994856058
Wed Dec 31 21:32:00 1969 | 19949.5 | 29920 | 141.242685621416
(2 rows)
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