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Commitc804ffb

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btree_gin: Fix calculation of leftmost interval value.
Formerly, the value computed by leftmostvalue_interval() was a longway short of the minimum possible interval value. As a result, anindex scan on a GIN index on an interval column with < or <= operatorswould miss large negative interval values.Fix by setting all fields of the leftmost interval to their minimumvalues, ensuring that the result is less than any other possibleinterval. Since this only affects index searches, no index rebuild isnecessary.Back-patch to all supported branches.Dean Rasheed, reviewed by Heikki Linnakangas.Discussion:https://postgr.es/m/CAEZATCV80%2BgOfF8ehNUUfaKBZgZMDfCfL-g1HhWGb6kC3rpDfw%40mail.gmail.com
1 parent7ab6971 commitc804ffb

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3 files changed

+17
-9
lines changed

3 files changed

+17
-9
lines changed

‎contrib/btree_gin/btree_gin.c

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -306,9 +306,9 @@ leftmostvalue_interval(void)
306306
{
307307
Interval*v=palloc(sizeof(Interval));
308308

309-
v->time=DT_NOBEGIN;
310-
v->day=0;
311-
v->month=0;
309+
v->time=PG_INT64_MIN;
310+
v->day=PG_INT32_MIN;
311+
v->month=PG_INT32_MIN;
312312
returnIntervalPGetDatum(v);
313313
}
314314

‎contrib/btree_gin/expected/interval.out

Lines changed: 11 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -3,30 +3,34 @@ CREATE TABLE test_interval (
33
i interval
44
);
55
INSERT INTO test_interval VALUES
6+
( '-178000000 years' ),
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( '03:55:08' ),
78
( '04:55:08' ),
89
( '05:55:08' ),
910
( '08:55:08' ),
1011
( '09:55:08' ),
11-
( '10:55:08' )
12+
( '10:55:08' ),
13+
( '178000000 years' )
1214
;
1315
CREATE INDEX idx_interval ON test_interval USING gin (i);
1416
SELECT * FROM test_interval WHERE i<'08:55:08'::interval ORDER BY i;
1517
i
1618
--------------------------
19+
@ 178000000 years ago
1720
@ 3 hours 55 mins 8 secs
1821
@ 4 hours 55 mins 8 secs
1922
@ 5 hours 55 mins 8 secs
20-
(3 rows)
23+
(4 rows)
2124

2225
SELECT * FROM test_interval WHERE i<='08:55:08'::interval ORDER BY i;
2326
i
2427
--------------------------
28+
@ 178000000 years ago
2529
@ 3 hours 55 mins 8 secs
2630
@ 4 hours 55 mins 8 secs
2731
@ 5 hours 55 mins 8 secs
2832
@ 8 hours 55 mins 8 secs
29-
(4 rows)
33+
(5 rows)
3034

3135
SELECT * FROM test_interval WHERE i='08:55:08'::interval ORDER BY i;
3236
i
@@ -40,12 +44,14 @@ SELECT * FROM test_interval WHERE i>='08:55:08'::interval ORDER BY i;
4044
@ 8 hours 55 mins 8 secs
4145
@ 9 hours 55 mins 8 secs
4246
@ 10 hours 55 mins 8 secs
43-
(3 rows)
47+
@ 178000000 years
48+
(4 rows)
4449

4550
SELECT * FROM test_interval WHERE i>'08:55:08'::interval ORDER BY i;
4651
i
4752
---------------------------
4853
@ 9 hours 55 mins 8 secs
4954
@ 10 hours 55 mins 8 secs
50-
(2 rows)
55+
@ 178000000 years
56+
(3 rows)
5157

‎contrib/btree_gin/sql/interval.sql

Lines changed: 3 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -5,12 +5,14 @@ CREATE TABLE test_interval (
55
);
66

77
INSERT INTO test_intervalVALUES
8+
('-178000000 years' ),
89
('03:55:08' ),
910
('04:55:08' ),
1011
('05:55:08' ),
1112
('08:55:08' ),
1213
('09:55:08' ),
13-
('10:55:08' )
14+
('10:55:08' ),
15+
('178000000 years' )
1416
;
1517

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CREATEINDEXidx_intervalON test_interval USING gin (i);

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