MySQL Bugs: #105297: Correct length formula for null-bitmask field in table_map

Bug #105297	Correct length formula for null-bitmask field in table_map_event
Submitted:	22 Oct 2021 15:09	Modified:	22 Oct 2021 15:55
Reporter:	DONGWOOK CHANG (OCA)	Email Updates:
Status:	Verified	Impact on me:	None
Category:	MySQL Server: Documentation	Severity:	S3 (Non-critical)
Version:		OS:	Any
Assigned to:		CPU Architecture:	Any
Tags:	null-bitmask, replication, TABLE_MAP_EVENT

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Description:
https://dev.mysql.com/doc/internals/en/table-map-event.html

The length formula for null-bitmask field is incorrect.
It must be corrected as below.
(column-count + 8) / 7 -> (column-count + 7) / 8

reference:

https://github.com/mysql/mysql-server/blob/3290a66c89eb1625a7058e0ef732432b6952b435/sql/lo...

https://github.com/mysql/mysql-server/blob/3290a66c89eb1625a7058e0ef732432b6952b435/libbin...

How to repeat:
The incorrect description can be found in:
https://dev.mysql.com/doc/internals/en/table-map-event.html

Thank you for the bug report.