#
# Bug #56680 InnoDB may return wrong results from a case-insensitive index
#
-- source include/have_innodb.inc

-- disable_query_log
SET @tx_isolation_orig = @@tx_isolation;
# The flag innodb_change_buffering_debug is only available in debug builds.
# It instructs InnoDB to try to evict pages from the buffer pool when
# change buffering is possible, so that the change buffer will be used
# whenever possible.
-- error 0,ER_UNKNOWN_SYSTEM_VARIABLE
SET @innodb_change_buffering_debug_orig = @@innodb_change_buffering_debug;
-- error 0,ER_UNKNOWN_SYSTEM_VARIABLE
SET GLOBAL innodb_change_buffering_debug = 1;
-- enable_query_log
SET GLOBAL tx_isolation='REPEATABLE-READ';

CREATE TABLE bug56680(
       a INT AUTO_INCREMENT PRIMARY KEY,
       b CHAR(1),
       c INT,
       INDEX(b))
ENGINE=InnoDB;

INSERT INTO bug56680 VALUES(0,'x',1);
BEGIN;
SELECT b FROM bug56680;

connect (con1,localhost,root,,);
connection con1;
BEGIN;
UPDATE bug56680 SET b='X';

connection default;
# This should return the last committed value 'x', but would return 'X'
# due to a bug in row_search_for_mysql().
SELECT b FROM bug56680;
# This would always return the last committed value 'x'.
SELECT * FROM bug56680;

connection con1;
ROLLBACK;
disconnect con1;

connection default;

SELECT b FROM bug56680;

# For the rest of this test, use the READ UNCOMMITTED isolation level
# to see what exists in the secondary index.
SET GLOBAL tx_isolation='READ-UNCOMMITTED';

# Create enough rows for the table, so that the insert buffer will be
# used for modifying the secondary index page. There must be multiple
# index pages, because changes to the root page are never buffered.

INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;

BEGIN;
SELECT b FROM bug56680 LIMIT 2;

connect (con1,localhost,root,,);
connection con1;
BEGIN;
DELETE FROM bug56680 WHERE a=1;
# This should be buffered, if innodb_change_buffering_debug = 1 is in effect.
INSERT INTO bug56680 VALUES(1,'X',1);

# This should force an insert buffer merge, and return 'X' in the first row.
SELECT b FROM bug56680 LIMIT 3;

connection default;
SELECT b FROM bug56680 LIMIT 2;
CHECK TABLE bug56680;

connection con1;
ROLLBACK;
SELECT b FROM bug56680 LIMIT 2;
CHECK TABLE bug56680;

connection default;
disconnect con1;

SELECT b FROM bug56680 LIMIT 2;

CREATE TABLE bug56680_2(
       a INT AUTO_INCREMENT PRIMARY KEY,
       b VARCHAR(2) CHARSET latin1 COLLATE latin1_german2_ci,
       c INT,
       INDEX(b))
ENGINE=InnoDB;

INSERT INTO bug56680_2 SELECT 0,_latin1 0xdf,c FROM bug56680;

BEGIN;
SELECT HEX(b) FROM bug56680_2 LIMIT 2;
DELETE FROM bug56680_2 WHERE a=1;
# This should be buffered, if innodb_change_buffering_debug = 1 is in effect.
INSERT INTO bug56680_2 VALUES(1,'SS',1);

# This should force an insert buffer merge, and return 'SS' in the first row.
SELECT HEX(b) FROM bug56680_2 LIMIT 3;
CHECK TABLE bug56680_2;

DELETE FROM bug56680_2 WHERE a=1;
# This should be buffered, if innodb_change_buffering_debug = 1 is in effect.
INSERT INTO bug56680_2 VALUES(1,_latin1 0xdf,1);

# This should force an insert buffer merge, and return 0xdf in the first row.
SELECT HEX(b) FROM bug56680_2 LIMIT 3;
CHECK TABLE bug56680_2;

DROP TABLE bug56680_2;
DROP TABLE bug56680;

-- disable_query_log
SET GLOBAL tx_isolation = @tx_isolation_orig;
-- error 0, ER_UNKNOWN_SYSTEM_VARIABLE
SET GLOBAL innodb_change_buffering_debug = @innodb_change_buffering_debug_orig;