[MDEV-9340] Copying from INT/DOUBLE to ENUM is inconsistent Created: 2015-12-29  Updated: 2016-01-11  Resolved: 2016-01-11

Status: Closed
Project: MariaDB Server
Component/s: OTHER
Affects Version/s: 5.5, 10.0, 10.1, 10.2
Fix Version/s: 10.2.0

Type: Bug Priority: Major
Reporter: Alexander Barkov Assignee: Alexander Barkov
Resolution: Fixed Votes: 0
Labels: None

Issue Links:
Blocks
blocks MDEV-4912 Data type plugin API version 1 Closed

 Description   

Copying from DOUBLE to ENUM in INSERT..SELECT

DROP TABLE IF EXISTS t1,t2;
 
CREATE TABLE t1 (a ENUM('9e200','9e100'));
 
CREATE TABLE t2 (a DOUBLE);
 
INSERT INTO t2 VALUES ('9e100');
 
INSERT INTO t1 SELECT * FROM t2;
 
SELECT * FROM t1;

returns

+------+
 
| a    |
 
+------+
 
|      |
 
+------+

Copying from DOUBLE to ENUM in ALTER

DROP TABLE IF EXISTS t1;
 
CREATE TABLE t1 (a DOUBLE);
 
INSERT INTO t1 VALUES (9e100);
 
ALTER TABLE t1 MODIFY a ENUM('9e200','9e100');
 
SELECT *FROM t1;

returns

+-------+
 
| a     |
 
+-------+
 
| 9e100 |
 
+-------+



 Comments   
Comment by Alexander Barkov [ 2015-12-29 ]

The same problem is observed when copying from INT to ENUM.

DROP TABLE IF EXISTS t1,t2;
 
CREATE TABLE t1 (a ENUM('200','100'));
 
CREATE TABLE t2 (a DOUBLE);
 
INSERT INTO t2 VALUES ('100');
 
INSERT INTO t1 SELECT * FROM t2;
 
SELECT * FROM t1;

returns

+------+
 
| a    |
 
+------+
 
|      |
 
+------+

while

DROP TABLE IF EXISTS t1;
 
CREATE TABLE t1 (a INT);
 
INSERT INTO t1 VALUES ('200');
 
ALTER TABLE t1 MODIFY a ENUM('200','100');
 
SELECT *FROM t1;

returns

+------+
 
| a    |
 
+------+
 
| 200  |
 
+------+

Comment by Alexander Barkov [ 2015-12-30 ]

The same problem is observed when copying from YEAR to ENUM.

DROP TABLE IF EXISTS t1,t2;
 
CREATE TABLE t1 (a ENUM('2001','2002'));
 
CREATE TABLE t2 (a YEAR);
 
INSERT INTO t2 VALUES ('2001');
 
INSERT INTO t1 SELECT * FROM t2;
 
SELECT * FROM t1;

returns

+------+
 
| a    |
 
+------+
 
|      |
 
+------+

so does

DROP TABLE IF EXISTS t1,t2;
 
CREATE TABLE t1 (a ENUM('2001','2002'));
 
CREATE TABLE t2 (a YEAR);
 
INSERT INTO t2 VALUES ('2001');
 
INSERT INTO t1 SELECT * FROM t2;
 
SELECT * FROM t1;

while

DROP TABLE IF EXISTS t1;
 
CREATE TABLE t1 (a YEAR);
 
INSERT INTO t1 VALUES ('2001');
 
ALTER TABLE t1 MODIFY a ENUM('2001','2002');
 
SELECT *FROM t1;

returns

+------+
 
| a    |
 
+------+
 
| 2001 |
 
+------+

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