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MDEV-17613 Read sole now-partition for non-historical versioned query #5386

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MDEV-17613 Read sole now-partition for non-historical versioned query #5386

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d09a889
MDEV-17613 bitmap_range() for iteration over partition bitmap
midenok Jul 13, 2026
7b2c034
MDEV-17613 Refactor prune_partitions() to build into a dedicated bitmap
midenok Jul 13, 2026
128b4f9
MDEV-17613 Refactor prune_partitions() to narrow read_partitions inst…
midenok Jul 14, 2026
7423a29
MDEV-17613 Read sole now-partition for non-historical versioned query
midenok Jul 14, 2026
99fd626
MDEV-17613 Test cleanup: sorted result for versioning.partition
midenok Jul 15, 2026
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13 changes: 11 additions & 2 deletions mysql-test/suite/versioning/r/partition,heap.rdiff
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
--- partition.result 2024-07-19 08:48:17.680094893 +0200
+++ partition,heap.result 2024-07-19 11:32:08.570439183 +0200
--- partition.result
+++ partition,heap.reject
@@ -2244,85 +2244,6 @@
(PARTITION `p0` HISTORY ENGINE = X,
PARTITION `pn` CURRENT ENGINE = X)
Expand Down Expand Up @@ -221,3 +221,12 @@
# INSERT .. ON DUPLICATE KEY UPDATE (ODKU)
set timestamp= unix_timestamp('2000-01-01 00:00:00');
create or replace table t1 (x int primary key) with system versioning
@@ -3663,7 +3456,7 @@
# (except heap combination)
explain extended select max(id) from t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
-1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00
Warnings:
Note 1003 select max(`test`.`t1`.`id`) AS `max(id)` from `test`.`t1`
drop tables t1;
66 changes: 60 additions & 6 deletions mysql-test/suite/versioning/r/partition.result
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Original file line number Diff line number Diff line change
Expand Up @@ -385,10 +385,10 @@ set timestamp=unix_timestamp('2001-02-04 10:30:10');
update t1 set i=6 where i=5;
select subpartition_name, partition_description, table_rows from information_schema.partitions where table_schema='test' and table_name='t1';
subpartition_name partition_description table_rows
p1sp0 2001-02-04 00:00:00 1
p1sp1 2001-02-04 00:00:00 0
p0sp0 2001-02-05 00:00:00 1
p0sp1 2001-02-05 00:00:00 1
p1sp0 2001-02-04 00:00:00 1
p1sp1 2001-02-04 00:00:00 0
p2sp0 2001-02-06 00:00:00 0
p2sp1 2001-02-06 00:00:00 0
pnsp0 CURRENT 0
Expand All @@ -398,8 +398,8 @@ i
1
select * from t1 partition (p0);
i
5
2
5
select * from t1 partition (p2);
i
alter table t1 rebuild partition p0, p1, p2;
Expand All @@ -408,8 +408,8 @@ i
1
select * from t1 partition (p0);
i
5
2
5
select * from t1 partition (p2);
i
## pruning check
Expand All @@ -421,7 +421,7 @@ i
6
explain partitions select * from t1;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 pn_pnsp0,pn_pnsp1 ALL NULL NULL NULL NULL # Using where
1 SIMPLE t1 pn_pnsp0,pn_pnsp1 ALL NULL NULL NULL NULL #
explain partitions select * from t1 for system_time as of '2001-02-04 10:20:30';
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p0_p0sp0,p0_p0sp1,p2_p2sp0,p2_p2sp1,pn_pnsp0,pn_pnsp1 ALL NULL NULL NULL NULL # Using where
Expand Down Expand Up @@ -2216,9 +2216,9 @@ t1 CREATE TABLE `t1` (
PARTITION `pn` CURRENT ENGINE = X)
select * from t1;
x
3
13
23
3
select * from t1 for system_time all order by x;
x
3
Expand Down Expand Up @@ -3641,5 +3641,59 @@ Table Op Msg_type Msg_text
test.t repair status OK
drop table t;
set timestamp=default;
#
# MDEV-17613 Read sole now-partition for non-historical versioned query
#
create table t1 (
id int,
ts timestamp(6) generated always as row start invisible,
te timestamp(6) generated always as row end invisible,
primary key (id, te),
period for system_time (ts, te)
) with system versioning
partition by system_time interval 1 month (
partition p0 history, partition p1 history, partition pcur current);
insert t1 values (1), (2), (0);
delete from t1 where id = 1;
select * from t1;
id
0
2
# Below there should be: Select tables optimized away
# (except heap combination)
explain extended select max(id) from t1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
Warnings:
Note 1003 select max(`test`.`t1`.`id`) AS `max(id)` from `test`.`t1`
drop tables t1;
# Corner cases: outer and sysvar-set FOR SYSTEM_TIME
set timestamp= unix_timestamp('2000-01-01 00:00:00');
create or replace table t1 (id int)
with system versioning
partition by system_time interval 1 hour
starts timestamp'2000-01-01 00:00:00' (
partition p0 history,
partition p1 history,
partition pn current);
insert into t1 values (1);
set timestamp= unix_timestamp('2000-01-01 01:30:00');
update t1 set id= 2;
# implicit query reads only the current partition (id=2):
select id from t1;
id
2
# outer FOR SYSTEM_TIME must propagate into derived t1 and read history (id=1):
select * from (select id from t1) for system_time as of timestamp'2000-01-01 01:00:00' as dt;
id
1
# system_versioning_asof must be honored and read history (id=1):
set system_versioning_asof= '2000-01-01 01:00:00';
select id from t1;
id
1
set system_versioning_asof= default;
set timestamp= default;
drop table t1;
# End of 10.11 tests
set global innodb_stats_persistent= @save_persistent;
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