Fix nbtree high key "continuescan" row compare bug.
Commit 29b64d1d
mishandled skipping over truncated high key attributes
during row comparisons. The row comparison key matching loop would loop
forever when a truncated attribute was encountered for a row compare
subkey. Fix by following the example of other code in the loop: advance
the current subkey, or break out of the loop when the last subkey is
reached.
Add test coverage for the relevant _bt_check_rowcompare() code path.
The new test case is somewhat tied to nbtree implementation details,
which isn't ideal, but seems unavoidable.
This commit is contained in:
parent
8fba397f0c
commit
76a39f2295
|
@ -1543,6 +1543,9 @@ _bt_check_rowcompare(ScanKey skey, IndexTuple tuple, int tupnatts,
|
|||
*/
|
||||
Assert(ScanDirectionIsForward(dir));
|
||||
cmpresult = 0;
|
||||
if (subkey->sk_flags & SK_ROW_END)
|
||||
break;
|
||||
subkey++;
|
||||
continue;
|
||||
}
|
||||
|
||||
|
|
|
@ -126,7 +126,7 @@ DETAIL: Key (c1, c2)=(1, 2) already exists.
|
|||
INSERT INTO tbl SELECT 1, NULL, 3*x, box('4,4,4,4') FROM generate_series(1,10) AS x;
|
||||
ERROR: null value in column "c2" violates not-null constraint
|
||||
DETAIL: Failing row contains (1, null, 3, (4,4),(4,4)).
|
||||
INSERT INTO tbl SELECT x, 2*x, NULL, NULL FROM generate_series(1,10) AS x;
|
||||
INSERT INTO tbl SELECT x, 2*x, NULL, NULL FROM generate_series(1,300) AS x;
|
||||
explain (costs off)
|
||||
select * from tbl where (c1,c2,c3) < (2,5,1);
|
||||
QUERY PLAN
|
||||
|
@ -144,7 +144,26 @@ select * from tbl where (c1,c2,c3) < (2,5,1);
|
|||
2 | 4 | |
|
||||
(2 rows)
|
||||
|
||||
-- row comparison that compares high key at page boundary
|
||||
SET enable_seqscan = off;
|
||||
explain (costs off)
|
||||
select * from tbl where (c1,c2,c3) < (262,1,1) limit 1;
|
||||
QUERY PLAN
|
||||
----------------------------------------------------
|
||||
Limit
|
||||
-> Index Only Scan using covering on tbl
|
||||
Index Cond: (ROW(c1, c2) <= ROW(262, 1))
|
||||
Filter: (ROW(c1, c2, c3) < ROW(262, 1, 1))
|
||||
(4 rows)
|
||||
|
||||
select * from tbl where (c1,c2,c3) < (262,1,1) limit 1;
|
||||
c1 | c2 | c3 | c4
|
||||
----+----+----+----
|
||||
1 | 2 | |
|
||||
(1 row)
|
||||
|
||||
DROP TABLE tbl;
|
||||
RESET enable_seqscan;
|
||||
CREATE TABLE tbl (c1 int,c2 int, c3 int, c4 box,
|
||||
UNIQUE(c1,c2) INCLUDE(c3,c4));
|
||||
SELECT indexrelid::regclass, indnatts, indnkeyatts, indisunique, indisprimary, indkey, indclass FROM pg_index WHERE indrelid = 'tbl'::regclass::oid;
|
||||
|
|
|
@ -72,11 +72,17 @@ SELECT pg_get_constraintdef(oid), conname, conkey FROM pg_constraint WHERE conre
|
|||
-- ensure that constraint works
|
||||
INSERT INTO tbl SELECT 1, 2, 3*x, box('4,4,4,4') FROM generate_series(1,10) AS x;
|
||||
INSERT INTO tbl SELECT 1, NULL, 3*x, box('4,4,4,4') FROM generate_series(1,10) AS x;
|
||||
INSERT INTO tbl SELECT x, 2*x, NULL, NULL FROM generate_series(1,10) AS x;
|
||||
INSERT INTO tbl SELECT x, 2*x, NULL, NULL FROM generate_series(1,300) AS x;
|
||||
explain (costs off)
|
||||
select * from tbl where (c1,c2,c3) < (2,5,1);
|
||||
select * from tbl where (c1,c2,c3) < (2,5,1);
|
||||
-- row comparison that compares high key at page boundary
|
||||
SET enable_seqscan = off;
|
||||
explain (costs off)
|
||||
select * from tbl where (c1,c2,c3) < (262,1,1) limit 1;
|
||||
select * from tbl where (c1,c2,c3) < (262,1,1) limit 1;
|
||||
DROP TABLE tbl;
|
||||
RESET enable_seqscan;
|
||||
|
||||
CREATE TABLE tbl (c1 int,c2 int, c3 int, c4 box,
|
||||
UNIQUE(c1,c2) INCLUDE(c3,c4));
|
||||
|
|
Loading…
Reference in New Issue