--source include/have_innodb.inc
--source include/not_valgrind.inc
--source include/not_embedded.inc
--source include/have_sequence.inc

SET GLOBAL innodb_defragment_stats_accuracy = 20;

DELETE FROM mysql.innodb_index_stats;

--echo # Create table.
CREATE TABLE t1 (a INT PRIMARY KEY AUTO_INCREMENT, b VARCHAR(256),
                 KEY SECOND(a, b)) ENGINE=INNODB STATS_PERSISTENT=0;

INSERT INTO t1 SELECT 100*FLOOR(seq/70)+seq%70, REPEAT('A', 256)
FROM seq_1_to_1024;

--echo # Not enough page splits to trigger persistent stats write yet.
SELECT * FROM mysql.innodb_index_stats;

INSERT INTO t1 SELECT 100*FLOOR(seq/70)+seq%70, REPEAT('A', 256)
FROM seq_1025_to_1433;

BEGIN;
let $num_delete = 20;
while ($num_delete)
{
    eval INSERT INTO t1 SELECT 100*$num_delete+seq, REPEAT('A', 256)
    FROM seq_70_to_99;
    dec $num_delete;
}
ROLLBACK;

SELECT @@GLOBAL.innodb_force_recovery<2 "have background defragmentation";

# Wait for defrag_pool to be processed.

let $wait_timeout=30;
let $wait_condition = SELECT COUNT(*)>0 FROM mysql.innodb_index_stats;
--source include/wait_condition.inc

--sorted_result
SELECT table_name, index_name, stat_name FROM mysql.innodb_index_stats;

optimize table t1;

--sorted_result
SELECT table_name, index_name, stat_name FROM mysql.innodb_index_stats;

set global innodb_defragment_stats_accuracy = 40;

INSERT INTO t1 (b) SELECT b from t1;

--sorted_result
SELECT table_name, index_name, stat_name FROM mysql.innodb_index_stats;

INSERT INTO t1 (b) SELECT b from t1;

--sorted_result
SELECT stat_name FROM mysql.innodb_index_stats WHERE table_name='t1';

--echo # Table rename should cause stats rename.
rename table t1 to t2;

--sorted_result
SELECT table_name, index_name, stat_name FROM mysql.innodb_index_stats;

--echo # Drop index should cause stats drop, but will not.
drop index SECOND on t2;

--echo #
--echo # MDEV-26636: Statistics must not be written for temporary tables
--echo #
SET GLOBAL innodb_defragment_stats_accuracy = 1;
CREATE TEMPORARY TABLE t (a INT PRIMARY KEY, c CHAR(255) NOT NULL)
ENGINE=InnoDB;
INSERT INTO t SELECT seq, '' FROM seq_1_to_100;

--source include/restart_mysqld.inc

--sorted_result
SELECT table_name, index_name, stat_name FROM mysql.innodb_index_stats;

--echo # Clean up
# Starting with 10.6, DROP TABLE will not touch persistent statistics
# (not defragmentation statistics either) if the table has none!
ALTER TABLE t2 STATS_PERSISTENT=1;
DROP TABLE t2;

SELECT * FROM mysql.innodb_index_stats;