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  1. MariaDB Server
  2. MDEV-20254

Problems with EMPTY_STRING_IS_NULL and I_S tables

Details

    Description

      INFORMATION_SCHEMA tables add DEFAULT clause for all columns.

      SET SQL_MODE= 'EMPTY_STRING_IS_NULL';
      		 
      SHOW CREATE TABLE INFORMATION_SCHEMA.TABLES;


      +--------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      		 
      | Table  | Create Table                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
      		 
      +--------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      		 
      | TABLES | CREATE TEMPORARY TABLE `TABLES` (
      		 
        `TABLE_CATALOG` varchar(512) NOT NULL DEFAULT '',
      		 
        `TABLE_SCHEMA` varchar(64) NOT NULL DEFAULT '',
      		 
        `TABLE_NAME` varchar(64) NOT NULL DEFAULT '',
      		 
        `TABLE_TYPE` varchar(64) NOT NULL DEFAULT '',
      		 
        `ENGINE` varchar(64) DEFAULT NULL,
      		 
        `VERSION` bigint(21) unsigned DEFAULT NULL,
      		 
        `ROW_FORMAT` varchar(10) DEFAULT NULL,
      		 
        `TABLE_ROWS` bigint(21) unsigned DEFAULT NULL,
      		 
        `AVG_ROW_LENGTH` bigint(21) unsigned DEFAULT NULL,
      		 
        `DATA_LENGTH` bigint(21) unsigned DEFAULT NULL,
      		 
        `MAX_DATA_LENGTH` bigint(21) unsigned DEFAULT NULL,
      		 
        `INDEX_LENGTH` bigint(21) unsigned DEFAULT NULL,
      		 
        `DATA_FREE` bigint(21) unsigned DEFAULT NULL,
      		 
        `AUTO_INCREMENT` bigint(21) unsigned DEFAULT NULL,
      		 
        `CREATE_TIME` datetime DEFAULT NULL,
      		 
        `UPDATE_TIME` datetime DEFAULT NULL,
      		 
        `CHECK_TIME` datetime DEFAULT NULL,
      		 
        `TABLE_COLLATION` varchar(32) DEFAULT NULL,
      		 
        `CHECKSUM` bigint(21) unsigned DEFAULT NULL,
      		 
        `CREATE_OPTIONS` varchar(2048) DEFAULT NULL,
      		 
        `TABLE_COMMENT` varchar(2048) NOT NULL DEFAULT '',
      		 
        `MAX_INDEX_LENGTH` bigint(21) unsigned DEFAULT NULL,
      		 
        `TEMPORARY` varchar(1) DEFAULT NULL
      		 
      ) ENGINE=MEMORY DEFAULT CHARSET=utf8 |
      		 
      +--------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

      This does not work well in combination with EMPTY_STRING_IS_NULL.

      If I copy a table definition and try to create it in another database, I get an error:

      SET SQL_MODE= 'EMPTY_STRING_IS_NULL';
      		 
      CREATE OR REPLACE TABLE t1 (TABLE_CATALOG varchar(512) NOT NULL DEFAULT '');


      ERROR 1067 (42000): Invalid default value for 'TABLE_CATALOG'

      I_S tables should probably not add DEFAULT clauses into columns.

      Attachments

        Issue Links

          duplicates

          Bug - A problem which impairs or prevents the functions of the product. MDEV-18918 SQL mode EMPTY_STRING_IS_NULL breaks RBR upon CREATE TABLE .. SELECT

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-21537 InnoDB INFORMATION_SCHEMA tables fail to define DEFAULT for ENUM NOT NULL

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-18918 SQL mode EMPTY_STRING_IS_NULL breaks RBR upon CREATE TABLE .. SELECT

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-23285 mysql.transaction_registry contains default values for the timestamp columns that conflict with NO_ZERO_DATE sql mode

          • Major - Major loss of function.
          • Confirmed

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              bar Alexander Barkov
              bar Alexander Barkov
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                Created:
                Updated:
                Resolved:

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