Performance with left join - Mailing list pgsql-general

Hi I am having trouble understanding a performance issue.

I have two identical structured tables sensor_values and sensor_values_cleaned

The structure is 

CREATE TABLE sensor_values

(

  ts timestamp with time zone NOT NULL,

  value double precision NOT NULL DEFAULT 'NaN'::real,

  sensor_id integer NOT NULL,

  CONSTRAINT sensor_values_sensor_id_fkey FOREIGN KEY (sensor_id)

      REFERENCES sensors (id) MATCH SIMPLE

      ON UPDATE NO ACTION ON DELETE NO ACTION,

  CONSTRAINT timestamp_sensor_index UNIQUE (ts, sensor_id)

)

There are indexes of the ts and sensor_id fields of both tables.

(The tables are actually many partition tables split by yearly quarters)

The problem query is

SELECT MIN(s1.ts)::timestamptz(0) AS min_time, AVG(s1.value), AVG(s2.value)

FROM sensor_values s1 LEFT JOIN sensor_values_cleaned s2 USING (sensor_id,ts)

 WHERE s1.ts::timestamptz >= '2011-02-25T20:25:07.192132+00:00'::timestamptz AND s1.ts::timestamptz <= '2012-12-31T23:59:59.999999'::timestamp 

 AND s1.sensor_id IN (904 ) GROUP BY s1.ts::timestamptz ORDER BY 1 DESC

The idea is to get the original data and cleaned data for each sensor_id.

My original query does a pivot on this data but I have removed it as that part is not slow.

sensor_id 904 has 88000 rows in sensor_values and 0 in sensor_values_cleaned

This query takes ~1300 ms after multiple runs.

The problem is when I add to the IN clause

ie

SELECT MIN(s1.ts)::timestamptz(0) AS min_time, AVG(s1.value), AVG(s2.value)

FROM sensor_values s1 LEFT JOIN sensor_values_cleaned s2 USING (sensor_id,ts)

 WHERE s1.ts::timestamptz >= '2011-02-25T20:25:07.192132+00:00'::timestamptz AND s1.ts::timestamptz <= '2012-12-31T23:59:59.999999'::timestamp 

 AND s1.sensor_id IN (904, 967 ) GROUP BY s1.ts::timestamptz ORDER BY 1 DESC

Takes 15 seconds with caching. On first run it took 40 !

sensor id 967 has 69600 rows in sensor_values and 0 in sensor_values_cleaned.

I have done a VACUUM ANALYZE

Any one know the issue or havd advice ?

There are quite a few Seq Scan on sensor_values_cleaned.

The indexes are present though.

Thanks 

My query analyse is below

"Sort  (cost=591617.09..592108.32 rows=196489 width=24) (actual time=42681.590..42697.469 rows=23726 loops=1)"

"  Sort Key: ((min(s1.ts))::timestamp(0) with time zone)"

"  Sort Method: quicksort  Memory: 2181kB"

"  ->  HashAggregate  (cost=570903.14..574341.69 rows=196489 width=24) (actual time=42621.109..42650.345 rows=23726 loops=1)"

"        ->  Hash Left Join  (cost=479570.32..568938.25 rows=196489 width=24) (actual time=38263.185..42579.388 rows=23726 loops=1)"

"              Hash Cond: ((s1.sensor_id = s2.sensor_id) AND (s1.ts = s2.ts))"

"              ->  Append  (cost=0.00..9889.73 rows=196489 width=20) (actual time=0.066..60.094 rows=23726 loops=1)"

"                    ->  Seq Scan on sensor_values s1  (cost=0.00..0.00 rows=1 width=20) (actual time=0.006..0.006 rows=0 loops=1)"

"                          Filter: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2011q1_sensor_id_idx on sensor_values_2011q1 s1  (cost=0.00..12.80 rows=1 width=20) (actual time=0.026..0.026 rows=0 loops=1)"

"                          Index Cond: (sensor_id = ANY ('{904,967}'::integer[]))"

"                          Filter: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone))"

"                    ->  Index Scan using sensor_values_2011q2_sensor_id_idx on sensor_values_2011q2 s1  (cost=0.00..54.67 rows=1195 width=20) (actual time=0.031..1.535 rows=1178 loops=1)"

"                          Index Cond: (sensor_id = ANY ('{904,967}'::integer[]))"

"                          Filter: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone))"

"                    ->  Index Scan using sensor_values_2011q3_sensor_id_idx on sensor_values_2011q3 s1  (cost=0.00..914.95 rows=22670 width=20) (actual time=0.031..29.946 rows=22548 loops=1)"

"                          Index Cond: (sensor_id = ANY ('{904,967}'::integer[]))"

"                          Filter: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone))"

"                    ->  Index Scan using sensor_values_2011q4_sensor_id_idx on sensor_values_2011q4 s1  (cost=0.00..8.94 rows=1 width=20) (actual time=0.011..0.011 rows=0 loops=1)"

"                          Index Cond: (sensor_id = ANY ('{904,967}'::integer[]))"

"                          Filter: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone))"

"                    ->  Index Scan using sensor_values_2012q1_sensor_id_idx on sensor_values_2012q1 s1  (cost=0.00..1823.47 rows=39681 width=20) (actual time=0.011..0.011 rows=0 loops=1)"

"                          Index Cond: (sensor_id = ANY ('{904,967}'::integer[]))"

"                          Filter: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone))"

"                    ->  Index Scan using sensor_values_2012q2_sensor_id_idx on sensor_values_2012q2 s1  (cost=0.00..1729.12 rows=38172 width=20) (actual time=0.011..0.011 rows=0 loops=1)"

"                          Index Cond: (sensor_id = ANY ('{904,967}'::integer[]))"

"                          Filter: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone))"

"                    ->  Index Scan using sensor_values_2012q3_sensor_id_idx on sensor_values_2012q3 s1  (cost=0.00..2657.86 rows=49181 width=20) (actual time=0.010..0.010 rows=0 loops=1)"

"                          Index Cond: (sensor_id = ANY ('{904,967}'::integer[]))"

"                          Filter: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone))"

"                    ->  Index Scan using sensor_values_2012q4_sensor_id_idx on sensor_values_2012q4 s1  (cost=0.00..2405.54 rows=45555 width=20) (actual time=0.011..0.011 rows=0 loops=1)"

"                          Index Cond: (sensor_id = ANY ('{904,967}'::integer[]))"

"                          Filter: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone))"

"                    ->  Index Scan using sensor_values_2013q1_timestamp_inx on sensor_values_2013q1 s1  (cost=0.00..9.42 rows=1 width=20) (actual time=0.007..0.007 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone))"

"                          Filter: (sensor_id = ANY ('{904,967}'::integer[]))"

"                    ->  Index Scan using sensor_values_2013q2_timestamp_inx on sensor_values_2013q2 s1  (cost=0.00..9.46 rows=1 width=20) (actual time=0.007..0.007 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone))"

"                          Filter: (sensor_id = ANY ('{904,967}'::integer[]))"

"                    ->  Index Scan using sensor_values_2013q3_timestamp_inx on sensor_values_2013q3 s1  (cost=0.00..9.37 rows=1 width=20) (actual time=0.007..0.007 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone))"

"                          Filter: (sensor_id = ANY ('{904,967}'::integer[]))"

"                    ->  Index Scan using sensor_values_2013q4_timestamp_inx on sensor_values_2013q4 s1  (cost=0.00..9.44 rows=1 width=20) (actual time=0.006..0.006 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone))"

"                          Filter: (sensor_id = ANY ('{904,967}'::integer[]))"

"                    ->  Index Scan using sensor_values_2014q1_timestamp_inx on sensor_values_2014q1 s1  (cost=0.00..9.52 rows=1 width=20) (actual time=0.007..0.007 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone))"

"                          Filter: (sensor_id = ANY ('{904,967}'::integer[]))"

"                    ->  Index Scan using sensor_values_2014q2_ts_sensor_unq on sensor_values_2014q2 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.004..0.004 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2014q3_ts_sensor_unq on sensor_values_2014q3 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.003..0.003 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2014q4_ts_sensor_unq on sensor_values_2014q4 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.003..0.003 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2015q1_ts_sensor_unq on sensor_values_2015q1 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.003..0.003 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2015q2_ts_sensor_unq on sensor_values_2015q2 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.003..0.003 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2015q3_ts_sensor_unq on sensor_values_2015q3 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.003..0.003 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2015q4_ts_sensor_unq on sensor_values_2015q4 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.003..0.003 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2016q1_ts_sensor_unq on sensor_values_2016q1 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.003..0.003 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2016q2_ts_sensor_unq on sensor_values_2016q2 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.003..0.003 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2016q3_ts_sensor_unq on sensor_values_2016q3 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.003..0.003 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2016q4_ts_sensor_unq on sensor_values_2016q4 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.003..0.003 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2017q1_ts_sensor_unq on sensor_values_2017q1 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.003..0.003 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2017q2_ts_sensor_unq on sensor_values_2017q2 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.003..0.003 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2017q3_ts_sensor_unq on sensor_values_2017q3 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.003..0.003 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2017q4_ts_sensor_unq on sensor_values_2017q4 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.003..0.003 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2018q1_ts_sensor_unq on sensor_values_2018q1 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.004..0.004 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2018q2_ts_sensor_unq on sensor_values_2018q2 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.004..0.004 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2018q3_ts_sensor_unq on sensor_values_2018q3 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.003..0.003 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2018q4_ts_sensor_unq on sensor_values_2018q4 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.003..0.003 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2019q1_ts_sensor_unq on sensor_values_2019q1 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.003..0.003 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2019q2_ts_sensor_unq on sensor_values_2019q2 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.003..0.003 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2019q3_ts_sensor_unq on sensor_values_2019q3 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.003..0.003 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2019q4_ts_sensor_unq on sensor_values_2019q4 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.003..0.003 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2020q1_ts_sensor_unq on sensor_values_2020q1 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.003..0.003 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2020q2_ts_sensor_unq on sensor_values_2020q2 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.003..0.003 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2020q3_ts_sensor_unq on sensor_values_2020q3 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.003..0.003 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"                    ->  Index Scan using sensor_values_2020q4_ts_sensor_unq on sensor_values_2020q4 s1  (cost=0.00..8.71 rows=1 width=20) (actual time=0.003..0.003 rows=0 loops=1)"

"                          Index Cond: ((ts >= '2011-02-25 20:25:07.192132+00'::timestamp with time zone) AND (ts <= '2012-12-31 23:59:59.999999'::timestamp without time zone) AND (sensor_id = ANY ('{904,967}'::integer[])))"

"              ->  Hash  (cost=214136.32..214136.32 rows=13029933 width=20) (actual time=38261.512..38261.512 rows=12978632 loops=1)"

"                    Buckets: 262144  Batches: 8  Memory Usage: 63455kB"

"                    ->  Append  (cost=0.00..214136.32 rows=13029933 width=20) (actual time=0.019..25614.299 rows=12978632 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned s2  (cost=0.00..0.00 rows=1 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2008q1 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2008q2 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.000..0.000 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2008q3 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2008q4 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2009q1 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.000..0.000 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2009q2 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2009q3 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2009q4 s2  (cost=0.00..2541.23 rows=155223 width=20) (actual time=0.006..127.251 rows=155223 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2010q1 s2  (cost=0.00..2677.47 rows=163547 width=20) (actual time=0.004..133.358 rows=163547 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2010q2 s2  (cost=0.00..2826.47 rows=172647 width=20) (actual time=0.006..133.242 rows=172647 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2010q3 s2  (cost=0.00..2867.73 rows=175173 width=20) (actual time=0.004..148.261 rows=175173 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2010q4 s2  (cost=0.00..3458.36 rows=211236 width=20) (actual time=0.007..166.847 rows=211236 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2011q1 s2  (cost=0.00..3088.72 rows=188672 width=20) (actual time=0.005..153.650 rows=188672 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2011q2 s2  (cost=0.00..3324.49 rows=203049 width=20) (actual time=0.007..164.005 rows=203049 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2011q3 s2  (cost=0.00..3447.54 rows=210554 width=20) (actual time=0.005..168.641 rows=210554 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2011q4 s2  (cost=0.00..3437.25 rows=209925 width=20) (actual time=0.004..162.842 rows=209925 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2012q1 s2  (cost=0.00..5061.45 rows=309145 width=20) (actual time=0.004..241.639 rows=309145 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2012q2 s2  (cost=0.00..13614.90 rows=822690 width=20) (actual time=0.005..672.308 rows=822690 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2012q3 s2  (cost=0.00..24117.15 rows=1452715 width=20) (actual time=0.006..1145.224 rows=1452715 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2012q4 s2  (cost=0.00..24191.32 rows=1457232 width=20) (actual time=0.005..1112.231 rows=1457232 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2013q1 s2  (cost=0.00..22728.12 rows=1388412 width=20) (actual time=0.004..1058.864 rows=1388412 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2013q2 s2  (cost=0.00..23573.43 rows=1440043 width=20) (actual time=0.005..1101.494 rows=1440043 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2013q3 s2  (cost=0.00..24149.37 rows=1475237 width=20) (actual time=0.003..1120.468 rows=1475237 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2013q4 s2  (cost=0.00..24905.49 rows=1521449 width=20) (actual time=0.004..1258.451 rows=1521449 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2014q1 s2  (cost=0.00..23272.43 rows=1421643 width=20) (actual time=0.004..1109.621 rows=1421683 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2014q2 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2014q3 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.000..0.000 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2014q4 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2015q1 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2015q2 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2015q3 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2015q4 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2016q1 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2016q2 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2016q3 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2016q4 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2017q1 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2017q2 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2017q3 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.000..0.000 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2017q4 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2018q1 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2018q2 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2018q3 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2018q4 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.000..0.000 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2019q1 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2019q2 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2019q3 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2019q4 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2020q1 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.000..0.000 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2020q2 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2020q3 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"                          ->  Seq Scan on sensor_values_cleaned_2020q4 s2  (cost=0.00..25.10 rows=1510 width=20) (actual time=0.001..0.001 rows=0 loops=1)"

"Total runtime: 42778.185 ms"