Details
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Bug
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Status: Open (View Workflow)
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Major
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Resolution: Unresolved
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10.4
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None
Description
In cases when instant modification of VARCHAR length is supported, the operation succeeds, but the value of Innodb_instant_alter_column is not increased. There are many ways to reproduce it, here is an example of such supported ALTER directly from the documentation:
--source include/have_innodb.inc
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CREATE OR REPLACE TABLE tab ( |
a int PRIMARY KEY, |
b varchar(50), |
c varchar(50) |
) ENGINE=InnoDB CHARACTER SET=latin1; |
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SET SESSION alter_algorithm='INSTANT'; |
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show status like '%instant%'; |
ALTER TABLE tab MODIFY COLUMN c varchar(100); |
show status like '%instant%'; |
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# Cleanup
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DROP TABLE tab; |
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10.4 c3394870 |
show status like '%instant%'; |
Variable_name Value
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Innodb_instant_alter_column 0
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ALTER TABLE tab MODIFY COLUMN c varchar(100); |
show status like '%instant%'; |
Variable_name Value
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Innodb_instant_alter_column 0
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Also reproducible on 10.5.
Attachments
Issue Links
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