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Commit 29624ea3 authored by Marko Mäkelä's avatar Marko Mäkelä
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MDEV-13176 ALTER TABLE…CHANGE col col TIMESTAMP NOT NULL DEFAULT… fails 

When it comes to DEFAULT values of columns, InnoDB is imposing both
unnecessary and insufficient conditions on whether ALGORITHM=INPLACE
should be allowed for ALTER TABLE.

When changing an existing column to NOT NULL, any NULL values in the
columns only get a special treatment if the column is changed to an
AUTO_INCREMENT column (which is not supported by ALGORITHM=INPLACE)
or the column type is TIMESTAMP. In all other cases, an error
must be reported for the failure to convert a NULL value to NOT NULL.

InnoDB was unnecessarily interested in whether the DEFAULT value
is not constant when altering other than TIMESTAMP columns. Also,
when changing a TIMESTAMP column to NOT NULL, InnoDB was performing
an insufficient check, and it was incorrectly allowing a constant
DEFAULT value while not being able to replace NULL values with that
constant value.

Furthermore, in ADD COLUMN, InnoDB is unnecessarily rejecting certain
nondeterministic DEFAULT expressions (depending on the session
parameters or the current time).
parent 02655a91
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Showing with 180 additions and 46 deletions
mysql-test/suite/innodb/r/innodb-alter-timestamp.result
View file @ 29624ea3
CREATE TABLE t1 (
`i1` INT(10) UNSIGNED NOT NULL,
`d1` TIMESTAMP NULL DEFAULT NULL
) ENGINE=innodb;
CREATE TABLE t1 (i1 INT UNSIGNED NULL DEFAULT 42) ENGINE=innodb;
INSERT INTO t1 VALUES(NULL);
ALTER TABLE t1 CHANGE i1 i1 INT UNSIGNED NOT NULL DEFAULT rand(),
ALGORITHM=INPLACE;
ERROR 22004: Invalid use of NULL value
ALTER TABLE t1 CHANGE i1 i1 INT UNSIGNED NOT NULL DEFAULT rand(),
ALGORITHM=COPY;
ERROR 01000: Data truncated for column 'i1' at row 1
ALTER TABLE t1 CHANGE i1 id INT UNSIGNED NOT NULL AUTO_INCREMENT,
ADD PRIMARY KEY(id), ALGORITHM=INPLACE;
ERROR 0A000: ALGORITHM=INPLACE is not supported. Reason: Cannot change column type INPLACE. Try ALGORITHM=COPY
ALTER TABLE t1 ADD PRIMARY KEY(i1), ALGORITHM=INPLACE;
ERROR 22004: Invalid use of NULL value
ALTER TABLE t1 CHANGE i1 id INT UNSIGNED NOT NULL AUTO_INCREMENT,
ADD PRIMARY KEY(id);
affected rows: 1
info: Records: 1 Duplicates: 0 Warnings: 0
SELECT * FROM t1;
id
1
SHOW CREATE TABLE t1;
Table Create Table
t1 CREATE TABLE `t1` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=latin1
DROP TABLE t1;
CREATE TABLE t1 (i1 INT UNSIGNED NOT NULL, d1 TIMESTAMP NULL) ENGINE=InnoDB;
SHOW CREATE TABLE t1;
Table Create Table
t1 CREATE TABLE `t1` (
......@@ -17,21 +41,56 @@ i1 d1
4 NULL
5 NULL
set sql_mode = 'STRICT_ALL_TABLES,NO_ZERO_DATE';
ALTER TABLE t1 CHANGE `d1` `d1` TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL;
ALTER TABLE t1 CHANGE d1 d1 TIMESTAMP NULL DEFAULT '2017-05-08 16:23:45',
ALGORITHM=INPLACE;
SELECT DISTINCT d1 FROM t1;
d1
NULL
ALTER TABLE t1 CHANGE d1 d1 TIMESTAMP NULL DEFAULT '2017-05-08 16:32:45',
ALGORITHM=COPY;
SELECT DISTINCT d1 FROM t1;
d1
NULL
ALTER TABLE t1 CHANGE d1 d1 TIMESTAMP DEFAULT '2017-05-08 16:32:54';
affected rows: 5
info: Records: 5 Duplicates: 0 Warnings: 0
# Note: NULL was changed to CURRENT_TIMESTAMP(),
# not the specified constant DEFAULT value!
SELECT COUNT(DISTINCT d1),COUNT(d1),COUNT(*) FROM t1;
COUNT(DISTINCT d1) COUNT(d1) COUNT(*)
1 5 5
SELECT DISTINCT (CURRENT_TIMESTAMP()-d1) <= 60 FROM t1;
(CURRENT_TIMESTAMP()-d1) <= 60
1
drop table t1;
CREATE TABLE t1 (
`i1` INT(10) UNSIGNED NOT NULL,
`d1` TIMESTAMP NULL DEFAULT NULL
) ENGINE=innodb;
INSERT INTO t1 (i1) VALUES (1), (2), (3), (4), (5);
ALTER TABLE t1 CHANGE `d1` `d1` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP;
ALTER TABLE t1 CHANGE d1 d1 TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP;
affected rows: 5
info: Records: 5 Duplicates: 0 Warnings: 0
ALTER TABLE t1 ADD COLUMN w1 varchar(20) NULL DEFAULT USER();
affected rows: 0
info: Records: 0 Duplicates: 0 Warnings: 0
ALTER TABLE t1 CHANGE w1 u1 varchar(30) NULL DEFAULT substr(USER(),1);
affected rows: 0
info: Records: 0 Duplicates: 0 Warnings: 0
SELECT u1, COUNT(DISTINCT d1) FROM t1 GROUP BY u1;
u1 COUNT(DISTINCT d1)
root@localhost 1
ALTER TABLE t1 ADD COLUMN d2 TIMESTAMP DEFAULT '2017-05-08 16:23:45',
LOCK=NONE;
affected rows: 0
info: Records: 0 Duplicates: 0 Warnings: 0
ALTER TABLE t1 ADD COLUMN d3 TIMESTAMP DEFAULT d1, LOCK=NONE;
ERROR 0A000: LOCK=NONE is not supported for this operation. Try LOCK=SHARED
ALTER TABLE t1 ADD COLUMN d3 TIMESTAMP DEFAULT d1, ALGORITHM=INPLACE;
ERROR 0A000: ALGORITHM=INPLACE is not supported for this operation. Try ALGORITHM=COPY
ALTER TABLE t1 ADD COLUMN d3 TIMESTAMP DEFAULT d1;
affected rows: 5
info: Records: 5 Duplicates: 0 Warnings: 0
SELECT d1-d3, d2 FROM t1;
d1-d3 d2
0 2017-05-08 16:23:45
......@@ -44,7 +103,17 @@ Table Create Table
t1 CREATE TABLE `t1` (
`i1` int(10) unsigned NOT NULL,
`d1` timestamp NOT NULL DEFAULT current_timestamp(),
`u1` varchar(30) DEFAULT substr(user(),1),
`d2` timestamp NOT NULL DEFAULT '2017-05-08 16:23:45',
`d3` timestamp NOT NULL DEFAULT `d1`
) ENGINE=InnoDB DEFAULT CHARSET=latin1
ALTER TABLE t1 ADD COLUMN d4 TIMESTAMP DEFAULT CURRENT_TIMESTAMP;
affected rows: 0
info: Records: 0 Duplicates: 0 Warnings: 0
SELECT COUNT(DISTINCT d4),COUNT(d4),COUNT(*) FROM t1;
COUNT(DISTINCT d4) COUNT(d4) COUNT(*)
1 5 5
SELECT DISTINCT (CURRENT_TIMESTAMP()-d4) <= 60 FROM t1;
(CURRENT_TIMESTAMP()-d4) <= 60
1
DROP TABLE t1;
mysql-test/suite/innodb/t/innodb-alter-timestamp.test
View file @ 29624ea3
--source include/have_innodb.inc
CREATE TABLE t1 (
`i1` INT(10) UNSIGNED NOT NULL,
`d1` TIMESTAMP NULL DEFAULT NULL
) ENGINE=innodb;
CREATE TABLE t1 (i1 INT UNSIGNED NULL DEFAULT 42) ENGINE=innodb;
INSERT INTO t1 VALUES(NULL);
--enable_info
--error ER_INVALID_USE_OF_NULL
ALTER TABLE t1 CHANGE i1 i1 INT UNSIGNED NOT NULL DEFAULT rand(),
ALGORITHM=INPLACE;
--error WARN_DATA_TRUNCATED
ALTER TABLE t1 CHANGE i1 i1 INT UNSIGNED NOT NULL DEFAULT rand(),
ALGORITHM=COPY;
--error ER_ALTER_OPERATION_NOT_SUPPORTED_REASON
ALTER TABLE t1 CHANGE i1 id INT UNSIGNED NOT NULL AUTO_INCREMENT,
ADD PRIMARY KEY(id), ALGORITHM=INPLACE;
--error ER_INVALID_USE_OF_NULL
ALTER TABLE t1 ADD PRIMARY KEY(i1), ALGORITHM=INPLACE;
ALTER TABLE t1 CHANGE i1 id INT UNSIGNED NOT NULL AUTO_INCREMENT,
ADD PRIMARY KEY(id);
--disable_info
SELECT * FROM t1;
SHOW CREATE TABLE t1;
DROP TABLE t1;
CREATE TABLE t1 (i1 INT UNSIGNED NOT NULL, d1 TIMESTAMP NULL) ENGINE=InnoDB;
SHOW CREATE TABLE t1;
INSERT INTO t1 (i1) VALUES (1), (2), (3), (4), (5);
select * from t1;
set sql_mode = 'STRICT_ALL_TABLES,NO_ZERO_DATE';
ALTER TABLE t1 CHANGE `d1` `d1` TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL;
ALTER TABLE t1 CHANGE d1 d1 TIMESTAMP NULL DEFAULT '2017-05-08 16:23:45',
ALGORITHM=INPLACE;
SELECT DISTINCT d1 FROM t1;
ALTER TABLE t1 CHANGE d1 d1 TIMESTAMP NULL DEFAULT '2017-05-08 16:32:45',
ALGORITHM=COPY;
SELECT DISTINCT d1 FROM t1;
--enable_info
ALTER TABLE t1 CHANGE d1 d1 TIMESTAMP DEFAULT '2017-05-08 16:32:54';
--disable_info
--echo # Note: NULL was changed to CURRENT_TIMESTAMP(),
--echo # not the specified constant DEFAULT value!
SELECT COUNT(DISTINCT d1),COUNT(d1),COUNT(*) FROM t1;
SELECT DISTINCT (CURRENT_TIMESTAMP()-d1) <= 60 FROM t1;
drop table t1;
CREATE TABLE t1 (
......@@ -18,8 +48,14 @@ CREATE TABLE t1 (
`d1` TIMESTAMP NULL DEFAULT NULL
) ENGINE=innodb;
INSERT INTO t1 (i1) VALUES (1), (2), (3), (4), (5);
ALTER TABLE t1 CHANGE `d1` `d1` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP;
--enable_info
ALTER TABLE t1 CHANGE d1 d1 TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP;
ALTER TABLE t1 ADD COLUMN w1 varchar(20) NULL DEFAULT USER();
ALTER TABLE t1 CHANGE w1 u1 varchar(30) NULL DEFAULT substr(USER(),1);
--disable_info
SELECT u1, COUNT(DISTINCT d1) FROM t1 GROUP BY u1;
--enable_info
ALTER TABLE t1 ADD COLUMN d2 TIMESTAMP DEFAULT '2017-05-08 16:23:45',
LOCK=NONE;
--error ER_ALTER_OPERATION_NOT_SUPPORTED
......@@ -27,6 +63,12 @@ ALTER TABLE t1 ADD COLUMN d3 TIMESTAMP DEFAULT d1, LOCK=NONE;
--error ER_ALTER_OPERATION_NOT_SUPPORTED
ALTER TABLE t1 ADD COLUMN d3 TIMESTAMP DEFAULT d1, ALGORITHM=INPLACE;
ALTER TABLE t1 ADD COLUMN d3 TIMESTAMP DEFAULT d1;
--disable_info
SELECT d1-d3, d2 FROM t1;
SHOW CREATE TABLE t1;
--enable_info
ALTER TABLE t1 ADD COLUMN d4 TIMESTAMP DEFAULT CURRENT_TIMESTAMP;
--disable_info
SELECT COUNT(DISTINCT d4),COUNT(d4),COUNT(*) FROM t1;
SELECT DISTINCT (CURRENT_TIMESTAMP()-d4) <= 60 FROM t1;
DROP TABLE t1;
storage/innobase/handler/handler0alter.cc
View file @ 29624ea3
......@@ -1011,6 +1011,7 @@ ha_innobase::check_if_supported_inplace_alter(
constant DEFAULT expression. */
cf_it.rewind();
Field **af = altered_table->field;
while (Create_field* cf = cf_it++) {
DBUG_ASSERT(cf->field
|| (ha_alter_info->handler_flags
......@@ -1018,49 +1019,71 @@ ha_innobase::check_if_supported_inplace_alter(
if (const Field* f = cf->field) {
/* This could be changing an existing column
from NULL to NOT NULL. For now, ensure that
the DEFAULT is a constant. */
if (~ha_alter_info->handler_flags
& (Alter_inplace_info::ALTER_COLUMN_NOT_NULLABLE
| Alter_inplace_info::ALTER_COLUMN_DEFAULT)
from NULL to NOT NULL. */
switch ((*af)->type()) {
case MYSQL_TYPE_TIMESTAMP:
case MYSQL_TYPE_TIMESTAMP2:
/* Inserting NULL into a TIMESTAMP column
would cause the DEFAULT value to be
replaced. Ensure that the DEFAULT
expression is not changing during
ALTER TABLE. */
if (!f->real_maybe_null()
|| (*af)->real_maybe_null()) {
/* This ALTER TABLE is not both changing
a column to NOT NULL and changing the
DEFAULT value of a column, or this column
does allow NULL after the ALTER TABLE. */
/* The column was NOT NULL, or it
will allow NULL after ALTER TABLE. */
goto next_column;
}
/* Find the matching column in the old table. */
Field** fp;
for (fp = table->field; *fp; fp++) {
if (f != *fp) {
continue;
}
if (!f->real_maybe_null()) {
/* The column already is NOT NULL. */
if (!(*af)->default_value
&& (*af)->is_real_null()) {
/* No DEFAULT value is
specified. We can report
errors for any NULL values for
the TIMESTAMP.
FIXME: Allow any DEFAULT
expression whose value does
not change during ALTER TABLE.
This would require a fix in
row_merge_read_clustered_index()
to try to replace the DEFAULT
value before reporting
DB_INVALID_NULL. */
goto next_column;
}
break;
}
/* The column must be found in the old table. */
DBUG_ASSERT(fp < &table->field[table->s->fields]);
}
if (!(*af)->default_value
|| (*af)->default_value->flags == 0) {
/* The NOT NULL column is not
carrying a non-constant DEFAULT. */
default:
/* For any other data type, NULL
values are not converted.
(An AUTO_INCREMENT attribute cannot
be introduced to a column with
ALGORITHM=INPLACE.) */
ut_ad((MTYP_TYPENR((*af)->unireg_check)
== Field::NEXT_NUMBER)
== (MTYP_TYPENR(f->unireg_check)
== Field::NEXT_NUMBER));
goto next_column;
}
/* TODO: Allow NULL column values to
be replaced with a non-constant DEFAULT. */
if (cf->field) {
ha_alter_info->unsupported_reason
= innobase_get_err_msg(
ER_ALTER_OPERATION_NOT_SUPPORTED_REASON_NOT_NULL);
} else if (!(*af)->default_value
|| !((*af)->default_value->flags
& ~(VCOL_SESSION_FUNC | VCOL_TIME_FUNC))) {
/* The added NOT NULL column lacks a DEFAULT value,
or the DEFAULT is the same for all rows.
(Time functions, such as CURRENT_TIMESTAMP(),
are evaluated from a timestamp that is assigned
at the start of the statement. Session
functions, such as USER(), always evaluate the
same within a statement.) */
/* Compute the DEFAULT values of non-constant columns
(VCOL_SESSION_FUNC | VCOL_TIME_FUNC). */
(*af)->set_default();
goto next_column;
}
DBUG_RETURN(HA_ALTER_INPLACE_NOT_SUPPORTED);
......
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