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FROM I_S Issue: ------ There is a difference in the field type created when the following DDLs are used: 1) CREATE TABLE t0 AS SELECT NULL; 2) CREATE TABLE t0 AS SELECT GREATEST(NULL,NULL); The first statement creates field of type Field_string and the second one creates a field of type Field_null. This creates a problem when the query mentioned in this bug is used. Since the null_ptr is calculated differently for Field_null. Solution: --------- When there is a function returning null in the select list as mentioned above, the field should be of type Field_string. This was fixed in 5.6+ as part of Bug#14021323. This is a backport to mysql-5.5. An incorrect comment in innodb_bug54044.test has been corrected in all versions.
19 lines
678 B
Plaintext
19 lines
678 B
Plaintext
CREATE TEMPORARY TABLE table_54044 ENGINE = INNODB
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AS SELECT IF(NULL IS NOT NULL, NULL, NULL);
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SHOW CREATE TABLE table_54044;
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Table Create Table
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table_54044 CREATE TEMPORARY TABLE `table_54044` (
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`IF(NULL IS NOT NULL, NULL, NULL)` binary(0) DEFAULT NULL
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) ENGINE=InnoDB DEFAULT CHARSET=latin1
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DROP TABLE table_54044;
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CREATE TABLE tmp ENGINE = INNODB
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AS SELECT COALESCE(NULL, NULL, NULL), GREATEST(NULL, NULL), NULL;
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SHOW CREATE TABLE tmp;
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Table Create Table
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tmp CREATE TABLE `tmp` (
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`COALESCE(NULL, NULL, NULL)` binary(0) DEFAULT NULL,
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`GREATEST(NULL, NULL)` binary(0) DEFAULT NULL,
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`NULL` binary(0) DEFAULT NULL
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) ENGINE=InnoDB DEFAULT CHARSET=latin1
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DROP TABLE tmp;
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