| Bug #104530 | show create table or mysqldump display 'null' default value on json field | ||
|---|---|---|---|
| Submitted: | 4 Aug 2021 8:53 | Modified: | 5 Aug 2021 13:49 |
| Reporter: | yuxiang jiang (OCA) | Email Updates: | |
| Status: | Verified | Impact on me: | |
| Category: | MySQL Server: DDL | Severity: | S3 (Non-critical) |
| Version: | 5.7.34, 5.7.35, 8.0.26 | OS: | Any |
| Assigned to: | CPU Architecture: | Any | |
| Tags: | Contribution | ||
[5 Aug 2021 13:49]
MySQL Verification Team
Hello yuxiang jiang, Thank you for the report. regards, Umesh
[5 Aug 2021 13:50]
MySQL Verification Team
-
bin/mysql -uroot -S /tmp/mysql_ushastry.sock --local-infile
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.35 MySQL Community Server (GPL)
Copyright (c) 2000, 2021, Oracle and/or its affiliates.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> create database test;
Query OK, 1 row affected (0.00 sec)
mysql> use test
Database changed
mysql> set sql_mode=0;
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> create table tjson7(f1 int, f2 json not null default '');
Query OK, 0 rows affected, 1 warning (0.01 sec)
mysql> show warnings;
+---------+------+---------------------------------------------------------------------+
| Level | Code | Message |
+---------+------+---------------------------------------------------------------------+
| Warning | 1101 | BLOB, TEXT, GEOMETRY or JSON column 'f2' can't have a default value |
+---------+------+---------------------------------------------------------------------+
1 row in set (0.00 sec)
mysql> show create table tjson7\G
*************************** 1. row ***************************
Table: tjson7
Create Table: CREATE TABLE `tjson7` (
`f1` int(11) DEFAULT NULL,
`f2` json NOT NULL DEFAULT 'null'
) ENGINE=InnoDB DEFAULT CHARSET=latin1
1 row in set (0.00 sec)
-
bin/mysqldump -uroot -S /tmp/mysql_ushastry.sock -d test tjson7 > /tmp/tjson7.sql
[umshastr@support-cluster03:/export/home/tmp/ushastry/mysql-5.7.35]$ cat /tmp/tjson7.sql
CREATE TABLE `tjson7` (
`f1` int(11) DEFAULT NULL,
`f2` json NOT NULL DEFAULT 'null'
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
--
bin/mysql -uroot -S /tmp/mysql_ushastry.sock --local-infile
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.7.35 MySQL Community Server (GPL)
Copyright (c) 2000, 2021, Oracle and/or its affiliates.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> use test
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> drop table tjson7;
Query OK, 0 rows affected (0.01 sec)
mysql> source /tmp/tjson7.sql
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected, 1 warning (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
ERROR 1101 (42000): BLOB, TEXT, GEOMETRY or JSON column 'f2' can't have a default value
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected, 1 warning (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
mysql> set sql_mode='';
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> source /tmp/tjson7.sql
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.01 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
ERROR 1101 (42000): BLOB, TEXT, GEOMETRY or JSON column 'f2' can't have a default value
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
[5 Aug 2021 13:53]
MySQL Verification Team
- 8.0.26 - same issue
bin/mysql -uroot -S /tmp/mysql_ushastry.sock --local-infile
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 7
Server version: 8.0.26 MySQL Community Server - GPL
Copyright (c) 2000, 2021, Oracle and/or its affiliates.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> create database test;
Query OK, 1 row affected (0.00 sec)
mysql> use test
Database changed
mysql> set sql_mode=0;
Query OK, 0 rows affected (0.00 sec)
mysql> create table tjson7(f1 int, f2 json not null default '');
Query OK, 0 rows affected, 1 warning (0.02 sec)
mysql> show warnings;
+---------+------+---------------------------------------------------------------------+
| Level | Code | Message |
+---------+------+---------------------------------------------------------------------+
| Warning | 1101 | BLOB, TEXT, GEOMETRY or JSON column 'f2' can't have a default value |
+---------+------+---------------------------------------------------------------------+
1 row in set (0.00 sec)
mysql> show create table tjson7\G
*************************** 1. row ***************************
Table: tjson7
Create Table: CREATE TABLE `tjson7` (
`f1` int DEFAULT NULL,
`f2` json NOT NULL DEFAULT 'null'
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
1 row in set (0.01 sec)
mysql>
[10 Aug 2021 4:38]
yuxiang jiang
fix for show create table (*) I confirm the code being submitted is offered under the terms of the OCA, and that I am authorized to contribute it.
Contribution: show_create_table_json.patch (application/octet-stream, text), 3.90 KiB.
[10 Aug 2021 5:21]
MySQL Verification Team
Thank you for the contribution. regards, Umesh
Description: After setting sql_mode to 0, SQL statement 'create table tjson7(f1 int, f2 json not null default '');' can be executed successfully. But retrieving create table SQL by show create table, the SQL will fail whatever sql_mode is stetted. And mysqldump will fail when import data. By checking the statement, we found that definition of " `f2` json NOT NULL DEFAULT 'null'" will cause stop creating table successfully. How to repeat: set sql_mode=0; create table tjson7(f1 int, f2 json not null default ''); ====== show create table tjson7; mysql> show create table tjson7\G *************************** 1. row *************************** Table: tjson7 Create Table: CREATE TABLE `tjson7` ( `f1` int DEFAULT NULL, `f2` json NOT NULL DEFAULT 'null' ) ENGINE=InnoDB DEFAULT CHARSET=latin1 ====== ./bin/mysqldump -uroot -S mysql.sock -d tdb1 tjson7 > /tmp/tjson7.sql -- -- Table structure for table `tjson7` -- DROP TABLE IF EXISTS `tjson7`; /*!40101 SET @saved_cs_client = @@character_set_client */; /*!40101 SET character_set_client = utf8 */; CREATE TABLE `tjson7` ( `f1` int(11) DEFAULT NULL, `f2` json NOT NULL DEFAULT 'null' ) ENGINE=InnoDB DEFAULT CHARSET=latin1;