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| author | Tomas Vondra <tomas.vondra@postgresql.org> | 2023-03-20 09:51:50 +0100 |
|---|---|---|
| committer | Tomas Vondra <tomas.vondra@postgresql.org> | 2023-03-20 10:20:35 +0100 |
| commit | 0c7726c2827e3ff685c460acd757a4b0c7ee09f7 (patch) | |
| tree | 22e63a65bd74b45ec865b146726681a506acf1db /src | |
| parent | 8de4660a57e6e165debc949d2cb922f60f8aa921 (diff) | |
| download | postgresql-0c7726c2827e3ff685c460acd757a4b0c7ee09f7.tar.gz postgresql-0c7726c2827e3ff685c460acd757a4b0c7ee09f7.zip | |
Fix netmask handling in inet_minmax_multi_ops
When calculating distance in brin_minmax_multi_distance_inet(), the
netmask was applied incorrectly. This results in (seemingly) incorrect
ordering of values, triggering an assert.
For builds without asserts this is mostly harmless - we may merge other
ranges, possibly resulting in slightly less efficient index. But it's
still correct and the greedy algorithm doesn't guarantee optimality
anyway.
Backpatch to 14, where minmax-multi indexes were introduced.
Reported by Dmitry Dolgov, investigation and fix by me.
Reported-by: Dmitry Dolgov
Backpatch-through: 14
Discussion: https://postgr.es/m/17774-c6f3e36dd4471e67@postgresql.org
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/access/brin/brin_minmax_multi.c | 4 | ||||
| -rw-r--r-- | src/test/regress/expected/brin_multi.out | 6 | ||||
| -rw-r--r-- | src/test/regress/sql/brin_multi.sql | 7 |
3 files changed, 15 insertions, 2 deletions
diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c index ef8370c1215..0713fd6588a 100644 --- a/src/backend/access/brin/brin_minmax_multi.c +++ b/src/backend/access/brin/brin_minmax_multi.c @@ -2364,14 +2364,14 @@ brin_minmax_multi_distance_inet(PG_FUNCTION_ARGS) unsigned char mask; int nbits; - nbits = lena - (i * 8); + nbits = Max(0, lena - (i * 8)); if (nbits < 8) { mask = (0xFF << (8 - nbits)); addra[i] = (addra[i] & mask); } - nbits = lenb - (i * 8); + nbits = Max(0, lenb - (i * 8)); if (nbits < 8) { mask = (0xFF << (8 - nbits)); diff --git a/src/test/regress/expected/brin_multi.out b/src/test/regress/expected/brin_multi.out index f3309f433f8..84c233c22ac 100644 --- a/src/test/regress/expected/brin_multi.out +++ b/src/test/regress/expected/brin_multi.out @@ -351,6 +351,12 @@ VACUUM brintest_multi; -- force a summarization cycle in brinidx insert into public.brintest_multi (float4col) values (real 'nan'); insert into public.brintest_multi (float8col) values (real 'nan'); UPDATE brintest_multi SET int8col = int8col * int4col; +-- Test handling of inet netmasks with inet_minmax_multi_ops +CREATE TABLE brin_test_inet (a inet); +CREATE INDEX ON brin_test_inet USING brin (a inet_minmax_multi_ops); +INSERT INTO brin_test_inet VALUES ('127.0.0.1/0'); +INSERT INTO brin_test_inet VALUES ('0.0.0.0/12'); +DROP TABLE brin_test_inet; -- Tests for brin_summarize_new_values SELECT brin_summarize_new_values('brintest_multi'); -- error, not an index ERROR: "brintest_multi" is not an index diff --git a/src/test/regress/sql/brin_multi.sql b/src/test/regress/sql/brin_multi.sql index 2189b6ccf42..9e8923f0b7a 100644 --- a/src/test/regress/sql/brin_multi.sql +++ b/src/test/regress/sql/brin_multi.sql @@ -357,6 +357,13 @@ insert into public.brintest_multi (float8col) values (real 'nan'); UPDATE brintest_multi SET int8col = int8col * int4col; +-- Test handling of inet netmasks with inet_minmax_multi_ops +CREATE TABLE brin_test_inet (a inet); +CREATE INDEX ON brin_test_inet USING brin (a inet_minmax_multi_ops); +INSERT INTO brin_test_inet VALUES ('127.0.0.1/0'); +INSERT INTO brin_test_inet VALUES ('0.0.0.0/12'); +DROP TABLE brin_test_inet; + -- Tests for brin_summarize_new_values SELECT brin_summarize_new_values('brintest_multi'); -- error, not an index SELECT brin_summarize_new_values('tenk1_unique1'); -- error, not a BRIN index |