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mariadb/mysql-test/suite/innodb_gis/t/rtree_split.test
Thirunarayanan Balathandayuthapani 413c59db32 MDEV-27675 Incorrect r-tree split after group assignment causes page overflow 
Problem:
========
- When an R-tree root page becomes full and requires splitting,
InnoDB follows a specific root-raising procedure to maintain
tree integrity. The process involves allocating a new page
(Page X) to hold the current root's content, preserving the
original root page number as the tree's entry point, and
migrating all existing records to Page X.

The root page is then cleared and reconstructed as an
internal node containing a single node pointer with an
MBR that encompasses all spatial objects on Page X.
Subsequently, InnoDB should split the records on Page X
into two spatially optimized groups using the
pick_seeds() and pick_next() algorithms,
creating a second page (Page Y) for Group B records
while retaining Group A records on Page X.

After records are redistributed between Page X and Page Y,
the recalculated MBR for Page X must remain within
or be smaller than the original MBR stored in the
root page's node pointer.

Bug scenario:
============
- When root page 4 becomes full, it triggers a split operation
where the content is copied to page 7 and root page 4 is cleared
to become an internal node.
- During the first split attempt on page 7, Group 1 overflows
and remaining entries are reassigned to Group 2.
- A new page 8 is created and the remaining entry record
is inserted, but the combined size of the remaining entry
record and new record exceeds the page size limit.
- This triggers a second split operation on page 7, where
Group 2 overflows again and entries are moved back to Group 1.
- When the new record is finally inserted into page 7,
it causes the MBR (Minimum Bounding Rectangle) for page 7
to expand beyond its original boundaries.
- Subsequently, when InnoDB attempts to update the parent
page 4 with the new MBR information, it fails to locate
the corresponding internal node, leading to spatial
index corruption and the reported failure.

Problem:
========
- Second split operation should happen on page 8, not on page 7.
- split_rtree_node() considers key_size to estimate
record sizes during the splitting algorithm, which fails to
account for variable-length fields in spatial records.
- In rtr_page_split_and_insert(), when reorganization
succeeds, InnoDB doesn't attempt the insert the entry

Solution:
========
rtr_page_split_and_insert(): InnoDB should do insert the
tuple when btr_page_reorganize() is successful.

rtr_page_split_and_insert(): Use the overflow page
for consecutive split operation.

split_rtree_node(): Store the record length for each
record in r-tree node. This should give proper
estimation while determining the group entries and
also helpful in overflow validation
2025-10-23 07:16:26 +03:00

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# WL#6745 InnoDB R-tree support
# This test case will test R-tree split, mostly on duplicate records.
# Not supported in embedded
--source include/not_embedded.inc
--source include/have_innodb.inc
--source include/big_test.inc
--source include/not_valgrind.inc
--source include/have_debug.inc
--source include/have_sequence.inc
let $restart_noprint=2;
# Create table with R-tree index.
create table t1 (c1 int, c2 geometry not null, spatial index (c2))engine=innodb;
begin;
# Insert enough values to let R-tree split.
insert into t1 select @s:=1+(seq mod 9), point(@s, @s)
from seq_1_to_576;
#Check second round spliting.
SET @saved_dbug = @@SESSION.debug_dbug;
SET debug_dbug = '+d,rtr_page_need_second_split';
insert into t1 select @s:=1+(seq mod 9), point(@s, @s)
from seq_1_to_576;
SET debug_dbug = @saved_dbug;
rollback;
insert into t1 select @s:=1+(seq mod 9), point(@s, @s)
from seq_1_to_2304;
begin;
insert into t1 select @s:=1+(seq mod 9), point(@s, @s)
from seq_1_to_2304;
rollback;
check table t1;
insert into t1 select @s:=1+(seq mod 9), point(@s, @s)
from seq_1_to_71424;
check table t1;
select count(*) from t1;
set @g1 = ST_GeomFromText('Polygon((0 0,0 100,100 100,100 0,0 0))');
select count(*) from t1 where MBRWithin(t1.c2, @g1);
set @g1 = ST_GeomFromText('Polygon((10 10,10 800,800 800,800 10,10 10))');
select count(*) from t1 where MBRWithin(t1.c2, @g1);
drop index c2 on t1;
# Test create index with algorithm=inplace
--enable_info
create spatial index idx2 on t1(c2);
--disable_info
show create table t1;
# test read only case
let $restart_parameters = --innodb-read-only;
--source include/restart_mysqld.inc
set @g1 = ST_GeomFromText('Polygon((0 0,0 100,100 100,100 0,0 0))');
select count(*) from t1 where MBRWithin(t1.c2, @g1);
set @g1 = ST_GeomFromText('Polygon((2 2,2 800,800 800,800 2,2 2))');
select count(*) from t1 where MBRWithin(t1.c2, @g1);
let $restart_parameters =;
--source include/restart_mysqld.inc
set @g1 = ST_GeomFromText('Polygon((0 0,0 100,100 100,100 0,0 0))');
select count(*) from t1 where MBRWithin(t1.c2, @g1);
set @g1 = ST_GeomFromText('Polygon((2 2,2 800,800 800,800 2,2 2))');
select count(*) from t1 where MBRWithin(t1.c2, @g1);
# Clean up.
drop table t1;
--echo #
--echo # MDEV-30400 Assertion height == btr_page_get_level ... on INSERT
--echo #
CREATE TABLE t1 (c POINT NOT NULL,SPATIAL (c)) ENGINE=InnoDB;
SET @save_limit=@@GLOBAL.innodb_limit_optimistic_insert_debug;
SET GLOBAL innodb_limit_optimistic_insert_debug=2;
BEGIN;
INSERT INTO t1 SELECT POINTFROMTEXT ('POINT(0 0)') FROM seq_1_to_6;
ROLLBACK;
SET GLOBAL innodb_limit_optimistic_insert_debug=@save_limit;
DROP TABLE t1;
--echo #
--echo # MDEV-27675 Incorrect r-tree split after group
--echo # assignment causes page overflow
--echo #
CREATE TABLE t1 (f1 INT, f2 INT, f3 VARCHAR(2500),
f4 MULTIPOLYGON NOT NULL,
PRIMARY KEY (f1,f2,f3), SPATIAL(f4)) ENGINE=InnoDB;
INSERT INTO t1 VALUES
(1,1,'id',MULTIPOLYGONFromText('MULTIPOLYGON(((0.12 0.53,0.23 0.92,0.12 0.53)))')),
(2,2,REPEAT('s',853),MULTIPOLYGONFromText('MULTIPOLYGON(((0.09 0.71,0.92 0.49,0.09 0.71)))')),
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(18,18,REPEAT('r',149),MULTIPOLYGONFromText('MULTIPOLYGON(((0.02 0.67,0.05 0.90,0.68 0.02,0.02 0.67)))')),
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(27,27,'c',MULTIPOLYGONFromText('MULTIPOLYGON(((0.72 0.28,0.62 0.71,0.04 1.00,0.12 0.57,0.72 0.28)))')),
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(37,37,REPEAT('e',276),MULTIPOLYGONFromText('MULTIPOLYGON(((0.65 0.67,0.65 0.67)))')),
(38,38,'ty',MULTIPOLYGONFromText('MULTIPOLYGON(((0.43 0.44,0.64 0.76,0.92 0.59,0.73 0.23,0.43 0.44)))')),
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(40,40,'hcsv',MULTIPOLYGONFromText('MULTIPOLYGON(((0.61 0.79,0.83 0.16,0.63 0.80,0.78 0.28,0.88 0.66,0.61 0.79)))')),
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(83,83,REPEAT('g',74),MULTIPOLYGONFromText('MULTIPOLYGON(((0.60 0.54,0.25 0.31,0.60 0.54)))')),
(84,84,REPEAT('s',214),MULTIPOLYGONFromText('MULTIPOLYGON(((0.80 0.34,0.09 0.74,0.47 0.96,0.55 0.19,0.80 0.34)))')),
(85,85,REPEAT('h',223),MULTIPOLYGONFromText('MULTIPOLYGON(((0.76 0.26,0.16 0.85,0.91 0.75,0.64 0.83,0.47 0.02,0.92 0.58,0.76 0.26)))')),
(86,86,'l',MULTIPOLYGONFromText('MULTIPOLYGON(((0.11 0.64,0.41 0.64,0.64 0.64,0.11 0.64)))')),
(87,87,'hj',MULTIPOLYGONFromText('MULTIPOLYGON(((0.66 1.00,0.21 0.96,0.52 0.44,0.94 0.06,0.80 0.39,0.33 0.57,0.30 0.89,0.66 1.00)))')),
(88,88,'axcs',MULTIPOLYGONFromText('MULTIPOLYGON(((0.20 0.66,0.71 0.41,0.32 0.94,0.30 0.66,0.50 0.49,0.60 0.67,0.20 0.66)))')),
(89,89,'cs',MULTIPOLYGONFromText('MULTIPOLYGON(((0.02 0.69,0.80 0.21,0.09 0.23,0.45 0.66,0.10 0.72,0.02 0.69)))')),
(90,90,'f',MULTIPOLYGONFromText('MULTIPOLYGON(((0.87 0.14,0.54 0.83,0.87 0.42,0.36 0.58,0.87 0.14)))')),
(91,91,'icq',MULTIPOLYGONFromText('MULTIPOLYGON(((0.73 0.57,0.36 0.41,0.86 0.33,0.76 0.49,0.44 0.83,0.73 0.57)))')),
(92,92,REPEAT('z',783),MULTIPOLYGONFromText('MULTIPOLYGON(((0.28 0.98,0.05 0.26,0.09 0.59,1.00 0.17,0.55 0.68,0.12 0.04,0.28 0.98)))')),
(93,93,'z',MULTIPOLYGONFromText('MULTIPOLYGON(((0.05 0.89,0.05 0.89)))')),
(94,94,REPEAT('x',1412),MULTIPOLYGONFromText('MULTIPOLYGON(((0.79 0.83,0.12 0.49,0.54 0.63,0.79 0.83)))')),
(95,95,REPEAT('u',2500),MULTIPOLYGONFromText('MULTIPOLYGON(((0.50 0.55,0.13 0.19,0.72 0.06,0.50 0.55)),((0.73 0.92,0.02 0.48,0.73 0.92)))'));
DROP TABLE t1;
--echo # End of 10.6 tests
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