MySQL Bugs: #112998: ALTER index VISIBLE/INVISIBLE with ALGORITHM=INSTANT

Bug #112998	ALTER index VISIBLE/INVISIBLE with ALGORITHM=INSTANT
Submitted:	8 Nov 2023 0:31	Modified:	5 Feb 2024 22:14
Reporter:	Piotr Biel	Email Updates:
Status:	Closed	Impact on me:	None
Category:	MySQL Server: Documentation	Severity:	S3 (Non-critical)
Version:	8.0	OS:	Any
Assigned to:		CPU Architecture:	Any

Description:
Documentation states that "Index type modification" can be done using INSTANT algorithm but at the same time there an info that VISIBLE/INVISIBLE happens in-place (INPLACE?).

Not really sure if this is just a request to improve online-ddl documentation or feature request ;) Probably both.

Seems like this may be the perfect case for INSTANT since indexes are being maintained by database anyway. Seems like a relatively small change that can be done this way.

How to repeat:
mysql> ALTER TABLE mytest_table ALTER INDEX my_test_index VISIBLE, ALGORITHM=INSTANT;
ERROR 1845 (0A000): ALGORITHM=INSTANT is not supported for this operation. Try ALGORITHM=COPY/INPLACE.
mysql>

Hi Mr. Beil,

Thank you for your bug report.

Unfortunately, this operation can not be done instantly.

But, there is not a single statement in the entire Manual about these attributes that you are changing.

This is now a verified documentation bug for versions 8.0 and higher.

Fixed in the Manuals for MySQL 8.0 and later versions, in mysqldoc rev 77774.

Closed.

Thank you, Jon.