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e09b48316c
inet, cidr, and timetz indexes still cannot support index-only scans, because they don't store the original unmodified value in the index, but a derived approximate value.
212 lines
4.9 KiB
Plaintext
212 lines
4.9 KiB
Plaintext
-- timestamptz check
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CREATE TABLE timestamptztmp (a timestamptz);
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\copy timestamptztmp from 'data/timestamptz.data'
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SET enable_seqscan=on;
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SELECT count(*) FROM timestamptztmp WHERE a < '2018-12-18 10:59:54 GMT+3';
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count
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-------
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391
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a <= '2018-12-18 10:59:54 GMT+3';
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count
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-------
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392
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a = '2018-12-18 10:59:54 GMT+3';
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count
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-------
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1
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a >= '2018-12-18 10:59:54 GMT+3';
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count
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-------
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158
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a > '2018-12-18 10:59:54 GMT+3';
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count
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-------
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157
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a < '2018-12-18 10:59:54 GMT+2';
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count
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-------
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391
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a <= '2018-12-18 10:59:54 GMT+2';
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count
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-------
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391
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a = '2018-12-18 10:59:54 GMT+2';
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count
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-------
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0
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a >= '2018-12-18 10:59:54 GMT+2';
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count
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-------
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158
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a > '2018-12-18 10:59:54 GMT+2';
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count
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-------
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158
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a < '2018-12-18 10:59:54 GMT+4';
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count
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-------
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392
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a <= '2018-12-18 10:59:54 GMT+4';
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count
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-------
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392
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a = '2018-12-18 10:59:54 GMT+4';
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count
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-------
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0
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a >= '2018-12-18 10:59:54 GMT+4';
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count
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-------
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157
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a > '2018-12-18 10:59:54 GMT+4';
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count
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-------
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157
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(1 row)
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SELECT a, a <-> '2018-12-18 10:59:54 GMT+2' FROM timestamptztmp ORDER BY a <-> '2018-12-18 10:59:54 GMT+2' LIMIT 3;
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a | ?column?
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------------------------------+-----------------------------------
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Tue Dec 18 05:59:54 2018 PST | @ 1 hour
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Thu Jan 10 03:01:34 2019 PST | @ 22 days 22 hours 1 min 40 secs
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Thu Jan 24 12:28:12 2019 PST | @ 37 days 7 hours 28 mins 18 secs
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(3 rows)
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CREATE INDEX timestamptzidx ON timestamptztmp USING gist ( a );
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SET enable_seqscan=off;
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SELECT count(*) FROM timestamptztmp WHERE a < '2018-12-18 10:59:54 GMT+3'::timestamptz;
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count
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-------
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391
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a <= '2018-12-18 10:59:54 GMT+3'::timestamptz;
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count
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-------
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392
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a = '2018-12-18 10:59:54 GMT+3'::timestamptz;
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count
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-------
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1
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a >= '2018-12-18 10:59:54 GMT+3'::timestamptz;
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count
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-------
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158
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a > '2018-12-18 10:59:54 GMT+3'::timestamptz;
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count
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-------
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157
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a < '2018-12-18 10:59:54 GMT+2'::timestamptz;
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count
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-------
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391
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a <= '2018-12-18 10:59:54 GMT+2'::timestamptz;
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count
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-------
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391
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a = '2018-12-18 10:59:54 GMT+2'::timestamptz;
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count
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-------
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0
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a >= '2018-12-18 10:59:54 GMT+2'::timestamptz;
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count
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-------
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158
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a > '2018-12-18 10:59:54 GMT+2'::timestamptz;
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count
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-------
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158
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a < '2018-12-18 10:59:54 GMT+4'::timestamptz;
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count
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-------
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392
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a <= '2018-12-18 10:59:54 GMT+4'::timestamptz;
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count
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-------
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392
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a = '2018-12-18 10:59:54 GMT+4'::timestamptz;
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count
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-------
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0
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a >= '2018-12-18 10:59:54 GMT+4'::timestamptz;
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count
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-------
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157
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(1 row)
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SELECT count(*) FROM timestamptztmp WHERE a > '2018-12-18 10:59:54 GMT+4'::timestamptz;
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count
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-------
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157
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(1 row)
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EXPLAIN (COSTS OFF)
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SELECT a, a <-> '2018-12-18 10:59:54 GMT+2' FROM timestamptztmp ORDER BY a <-> '2018-12-18 10:59:54 GMT+2' LIMIT 3;
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QUERY PLAN
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------------------------------------------------------------------------------------
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Limit
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-> Index Only Scan using timestamptzidx on timestamptztmp
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Order By: (a <-> 'Tue Dec 18 04:59:54 2018 PST'::timestamp with time zone)
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(3 rows)
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SELECT a, a <-> '2018-12-18 10:59:54 GMT+2' FROM timestamptztmp ORDER BY a <-> '2018-12-18 10:59:54 GMT+2' LIMIT 3;
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a | ?column?
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------------------------------+-----------------------------------
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Tue Dec 18 05:59:54 2018 PST | @ 1 hour
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Thu Jan 10 03:01:34 2019 PST | @ 22 days 22 hours 1 min 40 secs
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Thu Jan 24 12:28:12 2019 PST | @ 37 days 7 hours 28 mins 18 secs
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(3 rows)
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