diff --git a/mysql-test/suite/tokudb.change_column/r/change_int.result b/mysql-test/suite/tokudb.change_column/r/change_int.result
new file mode 100644
index 00000000000..f0b23a269e0
--- /dev/null
+++ b/mysql-test/suite/tokudb.change_column/r/change_int.result
@@ -0,0 +1,368 @@
+DROP TABLE IF EXISTS t;
+SET SESSION DEFAULT_STORAGE_ENGINE="TokuDB";
+SET SESSION TOKUDB_DISABLE_SLOW_ALTER=1;
+CREATE TABLE t (a TINYINT);
+INSERT INTO t VALUES ( -128 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 127 );
+ALTER TABLE t CHANGE COLUMN a a TINYINT;
+SELECT * FROM t;
+a
+-128
+-1
+0
+1
+127
+DROP TABLE t;
+CREATE TABLE t (a TINYINT);
+INSERT INTO t VALUES ( -128 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 127 );
+ALTER TABLE t CHANGE COLUMN a a SMALLINT;
+SELECT * FROM t;
+a
+-128
+-1
+0
+1
+127
+DROP TABLE t;
+CREATE TABLE t (a TINYINT);
+INSERT INTO t VALUES ( -128 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 127 );
+ALTER TABLE t CHANGE COLUMN a a MEDIUMINT;
+SELECT * FROM t;
+a
+-128
+-1
+0
+1
+127
+DROP TABLE t;
+CREATE TABLE t (a TINYINT);
+INSERT INTO t VALUES ( -128 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 127 );
+ALTER TABLE t CHANGE COLUMN a a INT;
+SELECT * FROM t;
+a
+-128
+-1
+0
+1
+127
+DROP TABLE t;
+CREATE TABLE t (a TINYINT);
+INSERT INTO t VALUES ( -128 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 127 );
+ALTER TABLE t CHANGE COLUMN a a BIGINT;
+SELECT * FROM t;
+a
+-128
+-1
+0
+1
+127
+DROP TABLE t;
+CREATE TABLE t (a SMALLINT);
+INSERT INTO t VALUES ( -32768 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 32767 );
+ALTER TABLE t CHANGE COLUMN a a TINYINT;
+ERROR 42000: Table 't' uses an extension that doesn't exist in this XYZ version
+SELECT * FROM t;
+a
+-32768
+-1
+0
+1
+32767
+DROP TABLE t;
+CREATE TABLE t (a SMALLINT);
+INSERT INTO t VALUES ( -32768 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 32767 );
+ALTER TABLE t CHANGE COLUMN a a SMALLINT;
+SELECT * FROM t;
+a
+-32768
+-1
+0
+1
+32767
+DROP TABLE t;
+CREATE TABLE t (a SMALLINT);
+INSERT INTO t VALUES ( -32768 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 32767 );
+ALTER TABLE t CHANGE COLUMN a a MEDIUMINT;
+SELECT * FROM t;
+a
+-32768
+-1
+0
+1
+32767
+DROP TABLE t;
+CREATE TABLE t (a SMALLINT);
+INSERT INTO t VALUES ( -32768 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 32767 );
+ALTER TABLE t CHANGE COLUMN a a INT;
+SELECT * FROM t;
+a
+-32768
+-1
+0
+1
+32767
+DROP TABLE t;
+CREATE TABLE t (a SMALLINT);
+INSERT INTO t VALUES ( -32768 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 32767 );
+ALTER TABLE t CHANGE COLUMN a a BIGINT;
+SELECT * FROM t;
+a
+-32768
+-1
+0
+1
+32767
+DROP TABLE t;
+CREATE TABLE t (a MEDIUMINT);
+INSERT INTO t VALUES ( -8388608 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 8388607 );
+ALTER TABLE t CHANGE COLUMN a a TINYINT;
+ERROR 42000: Table 't' uses an extension that doesn't exist in this XYZ version
+SELECT * FROM t;
+a
+-8388608
+-1
+0
+1
+8388607
+DROP TABLE t;
+CREATE TABLE t (a MEDIUMINT);
+INSERT INTO t VALUES ( -8388608 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 8388607 );
+ALTER TABLE t CHANGE COLUMN a a SMALLINT;
+ERROR 42000: Table 't' uses an extension that doesn't exist in this XYZ version
+SELECT * FROM t;
+a
+-8388608
+-1
+0
+1
+8388607
+DROP TABLE t;
+CREATE TABLE t (a MEDIUMINT);
+INSERT INTO t VALUES ( -8388608 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 8388607 );
+ALTER TABLE t CHANGE COLUMN a a MEDIUMINT;
+SELECT * FROM t;
+a
+-8388608
+-1
+0
+1
+8388607
+DROP TABLE t;
+CREATE TABLE t (a MEDIUMINT);
+INSERT INTO t VALUES ( -8388608 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 8388607 );
+ALTER TABLE t CHANGE COLUMN a a INT;
+SELECT * FROM t;
+a
+-8388608
+-1
+0
+1
+8388607
+DROP TABLE t;
+CREATE TABLE t (a MEDIUMINT);
+INSERT INTO t VALUES ( -8388608 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 8388607 );
+ALTER TABLE t CHANGE COLUMN a a BIGINT;
+SELECT * FROM t;
+a
+-8388608
+-1
+0
+1
+8388607
+DROP TABLE t;
+CREATE TABLE t (a INT);
+INSERT INTO t VALUES ( -2147483648 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 2147483647 );
+ALTER TABLE t CHANGE COLUMN a a TINYINT;
+ERROR 42000: Table 't' uses an extension that doesn't exist in this XYZ version
+SELECT * FROM t;
+a
+-2147483648
+0
+1
+2147483647
+DROP TABLE t;
+CREATE TABLE t (a INT);
+INSERT INTO t VALUES ( -2147483648 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 2147483647 );
+ALTER TABLE t CHANGE COLUMN a a SMALLINT;
+ERROR 42000: Table 't' uses an extension that doesn't exist in this XYZ version
+SELECT * FROM t;
+a
+-2147483648
+0
+1
+2147483647
+DROP TABLE t;
+CREATE TABLE t (a INT);
+INSERT INTO t VALUES ( -2147483648 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 2147483647 );
+ALTER TABLE t CHANGE COLUMN a a MEDIUMINT;
+ERROR 42000: Table 't' uses an extension that doesn't exist in this XYZ version
+SELECT * FROM t;
+a
+-2147483648
+0
+1
+2147483647
+DROP TABLE t;
+CREATE TABLE t (a INT);
+INSERT INTO t VALUES ( -2147483648 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 2147483647 );
+ALTER TABLE t CHANGE COLUMN a a INT;
+SELECT * FROM t;
+a
+-2147483648
+0
+1
+2147483647
+DROP TABLE t;
+CREATE TABLE t (a INT);
+INSERT INTO t VALUES ( -2147483648 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 2147483647 );
+ALTER TABLE t CHANGE COLUMN a a BIGINT;
+SELECT * FROM t;
+a
+-2147483648
+0
+1
+2147483647
+DROP TABLE t;
+CREATE TABLE t (a BIGINT);
+INSERT INTO t VALUES ( -9223372036854775808 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 9223372036854775807 );
+ALTER TABLE t CHANGE COLUMN a a TINYINT;
+ERROR 42000: Table 't' uses an extension that doesn't exist in this XYZ version
+SELECT * FROM t;
+a
+-9223372036854775808
+0
+1
+9223372036854775807
+DROP TABLE t;
+CREATE TABLE t (a BIGINT);
+INSERT INTO t VALUES ( -9223372036854775808 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 9223372036854775807 );
+ALTER TABLE t CHANGE COLUMN a a SMALLINT;
+ERROR 42000: Table 't' uses an extension that doesn't exist in this XYZ version
+SELECT * FROM t;
+a
+-9223372036854775808
+0
+1
+9223372036854775807
+DROP TABLE t;
+CREATE TABLE t (a BIGINT);
+INSERT INTO t VALUES ( -9223372036854775808 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 9223372036854775807 );
+ALTER TABLE t CHANGE COLUMN a a MEDIUMINT;
+ERROR 42000: Table 't' uses an extension that doesn't exist in this XYZ version
+SELECT * FROM t;
+a
+-9223372036854775808
+0
+1
+9223372036854775807
+DROP TABLE t;
+CREATE TABLE t (a BIGINT);
+INSERT INTO t VALUES ( -9223372036854775808 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 9223372036854775807 );
+ALTER TABLE t CHANGE COLUMN a a INT;
+ERROR 42000: Table 't' uses an extension that doesn't exist in this XYZ version
+SELECT * FROM t;
+a
+-9223372036854775808
+0
+1
+9223372036854775807
+DROP TABLE t;
+CREATE TABLE t (a BIGINT);
+INSERT INTO t VALUES ( -9223372036854775808 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 9223372036854775807 );
+ALTER TABLE t CHANGE COLUMN a a BIGINT;
+SELECT * FROM t;
+a
+-9223372036854775808
+0
+1
+9223372036854775807
+DROP TABLE t;
diff --git a/mysql-test/suite/tokudb.change_column/r/change_uint.result b/mysql-test/suite/tokudb.change_column/r/change_uint.result
new file mode 100644
index 00000000000..a504549b239
--- /dev/null
+++ b/mysql-test/suite/tokudb.change_column/r/change_uint.result
@@ -0,0 +1,288 @@
+DROP TABLE IF EXISTS t;
+SET SESSION DEFAULT_STORAGE_ENGINE="TokuDB";
+SET SESSION TOKUDB_DISABLE_SLOW_ALTER=1;
+CREATE TABLE t (a TINYINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 255 );
+ALTER TABLE t CHANGE COLUMN a a TINYINT UNSIGNED;
+SELECT * FROM t;
+a
+0
+1
+255
+DROP TABLE t;
+CREATE TABLE t (a TINYINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 255 );
+ALTER TABLE t CHANGE COLUMN a a SMALLINT UNSIGNED;
+SELECT * FROM t;
+a
+0
+1
+255
+DROP TABLE t;
+CREATE TABLE t (a TINYINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 255 );
+ALTER TABLE t CHANGE COLUMN a a MEDIUMINT UNSIGNED;
+SELECT * FROM t;
+a
+0
+1
+255
+DROP TABLE t;
+CREATE TABLE t (a TINYINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 255 );
+ALTER TABLE t CHANGE COLUMN a a INT UNSIGNED;
+SELECT * FROM t;
+a
+0
+1
+255
+DROP TABLE t;
+CREATE TABLE t (a TINYINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 255 );
+ALTER TABLE t CHANGE COLUMN a a BIGINT UNSIGNED;
+SELECT * FROM t;
+a
+0
+1
+255
+DROP TABLE t;
+CREATE TABLE t (a SMALLINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 65535 );
+ALTER TABLE t CHANGE COLUMN a a TINYINT UNSIGNED;
+ERROR 42000: Table 't' uses an extension that doesn't exist in this XYZ version
+SELECT * FROM t;
+a
+0
+1
+65535
+DROP TABLE t;
+CREATE TABLE t (a SMALLINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 65535 );
+ALTER TABLE t CHANGE COLUMN a a SMALLINT UNSIGNED;
+SELECT * FROM t;
+a
+0
+1
+65535
+DROP TABLE t;
+CREATE TABLE t (a SMALLINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 65535 );
+ALTER TABLE t CHANGE COLUMN a a MEDIUMINT UNSIGNED;
+SELECT * FROM t;
+a
+0
+1
+65535
+DROP TABLE t;
+CREATE TABLE t (a SMALLINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 65535 );
+ALTER TABLE t CHANGE COLUMN a a INT UNSIGNED;
+SELECT * FROM t;
+a
+0
+1
+65535
+DROP TABLE t;
+CREATE TABLE t (a SMALLINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 65535 );
+ALTER TABLE t CHANGE COLUMN a a BIGINT UNSIGNED;
+SELECT * FROM t;
+a
+0
+1
+65535
+DROP TABLE t;
+CREATE TABLE t (a MEDIUMINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 16777215 );
+ALTER TABLE t CHANGE COLUMN a a TINYINT UNSIGNED;
+ERROR 42000: Table 't' uses an extension that doesn't exist in this XYZ version
+SELECT * FROM t;
+a
+0
+1
+16777215
+DROP TABLE t;
+CREATE TABLE t (a MEDIUMINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 16777215 );
+ALTER TABLE t CHANGE COLUMN a a SMALLINT UNSIGNED;
+ERROR 42000: Table 't' uses an extension that doesn't exist in this XYZ version
+SELECT * FROM t;
+a
+0
+1
+16777215
+DROP TABLE t;
+CREATE TABLE t (a MEDIUMINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 16777215 );
+ALTER TABLE t CHANGE COLUMN a a MEDIUMINT UNSIGNED;
+SELECT * FROM t;
+a
+0
+1
+16777215
+DROP TABLE t;
+CREATE TABLE t (a MEDIUMINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 16777215 );
+ALTER TABLE t CHANGE COLUMN a a INT UNSIGNED;
+SELECT * FROM t;
+a
+0
+1
+16777215
+DROP TABLE t;
+CREATE TABLE t (a MEDIUMINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 16777215 );
+ALTER TABLE t CHANGE COLUMN a a BIGINT UNSIGNED;
+SELECT * FROM t;
+a
+0
+1
+16777215
+DROP TABLE t;
+CREATE TABLE t (a INT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 4294967295 );
+ALTER TABLE t CHANGE COLUMN a a TINYINT UNSIGNED;
+ERROR 42000: Table 't' uses an extension that doesn't exist in this XYZ version
+SELECT * FROM t;
+a
+0
+1
+4294967295
+DROP TABLE t;
+CREATE TABLE t (a INT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 4294967295 );
+ALTER TABLE t CHANGE COLUMN a a SMALLINT UNSIGNED;
+ERROR 42000: Table 't' uses an extension that doesn't exist in this XYZ version
+SELECT * FROM t;
+a
+0
+1
+4294967295
+DROP TABLE t;
+CREATE TABLE t (a INT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 4294967295 );
+ALTER TABLE t CHANGE COLUMN a a MEDIUMINT UNSIGNED;
+ERROR 42000: Table 't' uses an extension that doesn't exist in this XYZ version
+SELECT * FROM t;
+a
+0
+1
+4294967295
+DROP TABLE t;
+CREATE TABLE t (a INT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 4294967295 );
+ALTER TABLE t CHANGE COLUMN a a INT UNSIGNED;
+SELECT * FROM t;
+a
+0
+1
+4294967295
+DROP TABLE t;
+CREATE TABLE t (a INT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 4294967295 );
+ALTER TABLE t CHANGE COLUMN a a BIGINT UNSIGNED;
+SELECT * FROM t;
+a
+0
+1
+4294967295
+DROP TABLE t;
+CREATE TABLE t (a BIGINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 18446744073709551615 );
+ALTER TABLE t CHANGE COLUMN a a TINYINT UNSIGNED;
+ERROR 42000: Table 't' uses an extension that doesn't exist in this XYZ version
+SELECT * FROM t;
+a
+0
+1
+18446744073709551615
+DROP TABLE t;
+CREATE TABLE t (a BIGINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 18446744073709551615 );
+ALTER TABLE t CHANGE COLUMN a a SMALLINT UNSIGNED;
+ERROR 42000: Table 't' uses an extension that doesn't exist in this XYZ version
+SELECT * FROM t;
+a
+0
+1
+18446744073709551615
+DROP TABLE t;
+CREATE TABLE t (a BIGINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 18446744073709551615 );
+ALTER TABLE t CHANGE COLUMN a a MEDIUMINT UNSIGNED;
+ERROR 42000: Table 't' uses an extension that doesn't exist in this XYZ version
+SELECT * FROM t;
+a
+0
+1
+18446744073709551615
+DROP TABLE t;
+CREATE TABLE t (a BIGINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 18446744073709551615 );
+ALTER TABLE t CHANGE COLUMN a a INT UNSIGNED;
+ERROR 42000: Table 't' uses an extension that doesn't exist in this XYZ version
+SELECT * FROM t;
+a
+0
+1
+18446744073709551615
+DROP TABLE t;
+CREATE TABLE t (a BIGINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 18446744073709551615 );
+ALTER TABLE t CHANGE COLUMN a a BIGINT UNSIGNED;
+SELECT * FROM t;
+a
+0
+1
+18446744073709551615
+DROP TABLE t;
diff --git a/mysql-test/suite/tokudb.change_column/t/change_int.py b/mysql-test/suite/tokudb.change_column/t/change_int.py
new file mode 100644
index 00000000000..d27a68077f6
--- /dev/null
+++ b/mysql-test/suite/tokudb.change_column/t/change_int.py
@@ -0,0 +1,35 @@
+#!/usr/bin/env python
+
+# generate alter table test cases for integer types
+
+import sys
+def gen_matrix(types, values):
+    print "# this test is generated by change_int.py"
+    print "--disable_warnings"
+    print "DROP TABLE IF EXISTS t;"
+    print "--enable_warnings"
+    print "SET SESSION DEFAULT_STORAGE_ENGINE=\"TokuDB\";"
+    print "SET SESSION TOKUDB_DISABLE_SLOW_ALTER=1;"
+    for a in range(len(types)):
+        for b in range(len(types)):
+            print
+            print "CREATE TABLE t (a %s);" % (types[a])
+            for x in values[a]:
+                print "INSERT INTO t VALUES (", x, ");"
+            if a > b:
+                print "--replace_regex /MariaDB/XYZ/ /MySQL/XYZ/"
+                print "--error ER_UNSUPPORTED_EXTENSION"
+            print "ALTER TABLE t CHANGE COLUMN a a %s;" % (types[b])
+            print "SELECT * FROM t;"
+            print "DROP TABLE t;"
+def main():
+    gen_matrix(
+        [ "TINYINT", "SMALLINT", "MEDIUMINT", "INT", "BIGINT" ], 
+        [ [ -128, -1, 0, 1, 127 ], [ -32768, -1, 0, 1, 32767], [-8388608, -1, 0, 1, 8388607], [-2147483648, 0, 1, 2147483647], [-9223372036854775808, 0, 1, 9223372036854775807] ]
+    )
+    gen_matrix(
+        [ "TINYINT UNSIGNED", "SMALLINT UNSIGNED", "MEDIUMINT UNSIGNED", "INT UNSIGNED", "BIGINT UNSIGNED" ],
+        [ [ 0, 1, 255 ], [ 0, 1, 65535], [0, 1, 16777215], [0, 1, 4294967295], [0, 1, 18446744073709551615] ]
+    )
+    return 0
+sys.exit(main())
diff --git a/mysql-test/suite/tokudb.change_column/t/change_int.test b/mysql-test/suite/tokudb.change_column/t/change_int.test
new file mode 100644
index 00000000000..bd5e746b026
--- /dev/null
+++ b/mysql-test/suite/tokudb.change_column/t/change_int.test
@@ -0,0 +1,266 @@
+# this test is generated by change_int.py
+--disable_warnings
+DROP TABLE IF EXISTS t;
+--enable_warnings
+SET SESSION DEFAULT_STORAGE_ENGINE="TokuDB";
+SET SESSION TOKUDB_DISABLE_SLOW_ALTER=1;
+
+CREATE TABLE t (a TINYINT);
+INSERT INTO t VALUES ( -128 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 127 );
+ALTER TABLE t CHANGE COLUMN a a TINYINT;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a TINYINT);
+INSERT INTO t VALUES ( -128 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 127 );
+ALTER TABLE t CHANGE COLUMN a a SMALLINT;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a TINYINT);
+INSERT INTO t VALUES ( -128 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 127 );
+ALTER TABLE t CHANGE COLUMN a a MEDIUMINT;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a TINYINT);
+INSERT INTO t VALUES ( -128 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 127 );
+ALTER TABLE t CHANGE COLUMN a a INT;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a TINYINT);
+INSERT INTO t VALUES ( -128 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 127 );
+ALTER TABLE t CHANGE COLUMN a a BIGINT;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a SMALLINT);
+INSERT INTO t VALUES ( -32768 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 32767 );
+--replace_regex /MariaDB/XYZ/ /MySQL/XYZ/
+--error ER_UNSUPPORTED_EXTENSION
+ALTER TABLE t CHANGE COLUMN a a TINYINT;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a SMALLINT);
+INSERT INTO t VALUES ( -32768 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 32767 );
+ALTER TABLE t CHANGE COLUMN a a SMALLINT;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a SMALLINT);
+INSERT INTO t VALUES ( -32768 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 32767 );
+ALTER TABLE t CHANGE COLUMN a a MEDIUMINT;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a SMALLINT);
+INSERT INTO t VALUES ( -32768 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 32767 );
+ALTER TABLE t CHANGE COLUMN a a INT;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a SMALLINT);
+INSERT INTO t VALUES ( -32768 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 32767 );
+ALTER TABLE t CHANGE COLUMN a a BIGINT;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a MEDIUMINT);
+INSERT INTO t VALUES ( -8388608 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 8388607 );
+--replace_regex /MariaDB/XYZ/ /MySQL/XYZ/
+--error ER_UNSUPPORTED_EXTENSION
+ALTER TABLE t CHANGE COLUMN a a TINYINT;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a MEDIUMINT);
+INSERT INTO t VALUES ( -8388608 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 8388607 );
+--replace_regex /MariaDB/XYZ/ /MySQL/XYZ/
+--error ER_UNSUPPORTED_EXTENSION
+ALTER TABLE t CHANGE COLUMN a a SMALLINT;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a MEDIUMINT);
+INSERT INTO t VALUES ( -8388608 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 8388607 );
+ALTER TABLE t CHANGE COLUMN a a MEDIUMINT;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a MEDIUMINT);
+INSERT INTO t VALUES ( -8388608 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 8388607 );
+ALTER TABLE t CHANGE COLUMN a a INT;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a MEDIUMINT);
+INSERT INTO t VALUES ( -8388608 );
+INSERT INTO t VALUES ( -1 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 8388607 );
+ALTER TABLE t CHANGE COLUMN a a BIGINT;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a INT);
+INSERT INTO t VALUES ( -2147483648 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 2147483647 );
+--replace_regex /MariaDB/XYZ/ /MySQL/XYZ/
+--error ER_UNSUPPORTED_EXTENSION
+ALTER TABLE t CHANGE COLUMN a a TINYINT;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a INT);
+INSERT INTO t VALUES ( -2147483648 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 2147483647 );
+--replace_regex /MariaDB/XYZ/ /MySQL/XYZ/
+--error ER_UNSUPPORTED_EXTENSION
+ALTER TABLE t CHANGE COLUMN a a SMALLINT;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a INT);
+INSERT INTO t VALUES ( -2147483648 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 2147483647 );
+--replace_regex /MariaDB/XYZ/ /MySQL/XYZ/
+--error ER_UNSUPPORTED_EXTENSION
+ALTER TABLE t CHANGE COLUMN a a MEDIUMINT;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a INT);
+INSERT INTO t VALUES ( -2147483648 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 2147483647 );
+ALTER TABLE t CHANGE COLUMN a a INT;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a INT);
+INSERT INTO t VALUES ( -2147483648 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 2147483647 );
+ALTER TABLE t CHANGE COLUMN a a BIGINT;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a BIGINT);
+INSERT INTO t VALUES ( -9223372036854775808 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 9223372036854775807 );
+--replace_regex /MariaDB/XYZ/ /MySQL/XYZ/
+--error ER_UNSUPPORTED_EXTENSION
+ALTER TABLE t CHANGE COLUMN a a TINYINT;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a BIGINT);
+INSERT INTO t VALUES ( -9223372036854775808 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 9223372036854775807 );
+--replace_regex /MariaDB/XYZ/ /MySQL/XYZ/
+--error ER_UNSUPPORTED_EXTENSION
+ALTER TABLE t CHANGE COLUMN a a SMALLINT;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a BIGINT);
+INSERT INTO t VALUES ( -9223372036854775808 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 9223372036854775807 );
+--replace_regex /MariaDB/XYZ/ /MySQL/XYZ/
+--error ER_UNSUPPORTED_EXTENSION
+ALTER TABLE t CHANGE COLUMN a a MEDIUMINT;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a BIGINT);
+INSERT INTO t VALUES ( -9223372036854775808 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 9223372036854775807 );
+--replace_regex /MariaDB/XYZ/ /MySQL/XYZ/
+--error ER_UNSUPPORTED_EXTENSION
+ALTER TABLE t CHANGE COLUMN a a INT;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a BIGINT);
+INSERT INTO t VALUES ( -9223372036854775808 );
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 9223372036854775807 );
+ALTER TABLE t CHANGE COLUMN a a BIGINT;
+SELECT * FROM t;
+DROP TABLE t;
diff --git a/mysql-test/suite/tokudb.change_column/t/change_uint.test b/mysql-test/suite/tokudb.change_column/t/change_uint.test
new file mode 100644
index 00000000000..e2b830e974c
--- /dev/null
+++ b/mysql-test/suite/tokudb.change_column/t/change_uint.test
@@ -0,0 +1,226 @@
+# this test is generated by change_int.py
+--disable_warnings
+DROP TABLE IF EXISTS t;
+--enable_warnings
+SET SESSION DEFAULT_STORAGE_ENGINE="TokuDB";
+SET SESSION TOKUDB_DISABLE_SLOW_ALTER=1;
+
+CREATE TABLE t (a TINYINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 255 );
+ALTER TABLE t CHANGE COLUMN a a TINYINT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a TINYINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 255 );
+ALTER TABLE t CHANGE COLUMN a a SMALLINT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a TINYINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 255 );
+ALTER TABLE t CHANGE COLUMN a a MEDIUMINT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a TINYINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 255 );
+ALTER TABLE t CHANGE COLUMN a a INT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a TINYINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 255 );
+ALTER TABLE t CHANGE COLUMN a a BIGINT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a SMALLINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 65535 );
+--replace_regex /MariaDB/XYZ/ /MySQL/XYZ/
+--error ER_UNSUPPORTED_EXTENSION
+ALTER TABLE t CHANGE COLUMN a a TINYINT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a SMALLINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 65535 );
+ALTER TABLE t CHANGE COLUMN a a SMALLINT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a SMALLINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 65535 );
+ALTER TABLE t CHANGE COLUMN a a MEDIUMINT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a SMALLINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 65535 );
+ALTER TABLE t CHANGE COLUMN a a INT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a SMALLINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 65535 );
+ALTER TABLE t CHANGE COLUMN a a BIGINT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a MEDIUMINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 16777215 );
+--replace_regex /MariaDB/XYZ/ /MySQL/XYZ/
+--error ER_UNSUPPORTED_EXTENSION
+ALTER TABLE t CHANGE COLUMN a a TINYINT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a MEDIUMINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 16777215 );
+--replace_regex /MariaDB/XYZ/ /MySQL/XYZ/
+--error ER_UNSUPPORTED_EXTENSION
+ALTER TABLE t CHANGE COLUMN a a SMALLINT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a MEDIUMINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 16777215 );
+ALTER TABLE t CHANGE COLUMN a a MEDIUMINT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a MEDIUMINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 16777215 );
+ALTER TABLE t CHANGE COLUMN a a INT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a MEDIUMINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 16777215 );
+ALTER TABLE t CHANGE COLUMN a a BIGINT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a INT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 4294967295 );
+--replace_regex /MariaDB/XYZ/ /MySQL/XYZ/
+--error ER_UNSUPPORTED_EXTENSION
+ALTER TABLE t CHANGE COLUMN a a TINYINT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a INT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 4294967295 );
+--replace_regex /MariaDB/XYZ/ /MySQL/XYZ/
+--error ER_UNSUPPORTED_EXTENSION
+ALTER TABLE t CHANGE COLUMN a a SMALLINT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a INT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 4294967295 );
+--replace_regex /MariaDB/XYZ/ /MySQL/XYZ/
+--error ER_UNSUPPORTED_EXTENSION
+ALTER TABLE t CHANGE COLUMN a a MEDIUMINT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a INT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 4294967295 );
+ALTER TABLE t CHANGE COLUMN a a INT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a INT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 4294967295 );
+ALTER TABLE t CHANGE COLUMN a a BIGINT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a BIGINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 18446744073709551615 );
+--replace_regex /MariaDB/XYZ/ /MySQL/XYZ/
+--error ER_UNSUPPORTED_EXTENSION
+ALTER TABLE t CHANGE COLUMN a a TINYINT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a BIGINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 18446744073709551615 );
+--replace_regex /MariaDB/XYZ/ /MySQL/XYZ/
+--error ER_UNSUPPORTED_EXTENSION
+ALTER TABLE t CHANGE COLUMN a a SMALLINT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a BIGINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 18446744073709551615 );
+--replace_regex /MariaDB/XYZ/ /MySQL/XYZ/
+--error ER_UNSUPPORTED_EXTENSION
+ALTER TABLE t CHANGE COLUMN a a MEDIUMINT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a BIGINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 18446744073709551615 );
+--replace_regex /MariaDB/XYZ/ /MySQL/XYZ/
+--error ER_UNSUPPORTED_EXTENSION
+ALTER TABLE t CHANGE COLUMN a a INT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;
+
+CREATE TABLE t (a BIGINT UNSIGNED);
+INSERT INTO t VALUES ( 0 );
+INSERT INTO t VALUES ( 1 );
+INSERT INTO t VALUES ( 18446744073709551615 );
+ALTER TABLE t CHANGE COLUMN a a BIGINT UNSIGNED;
+SELECT * FROM t;
+DROP TABLE t;