ParadoxV5 aaa02f6aa3 MDEV-35693: Improve SHOW REPLICA STATUS column sizes ...

Resize the types and widths of SHOW REPLICA STATUS
(technically `INFORMATION_SCHEMA.SLAVE_STATUS`)
columns to better match their possible values

In case of intentionally but absurdly long lists,
text columns that list an uncapped number of elements
have expanded to accept as many bytes as we could support.

Particularly, the first-gen `Replicate_` filters were
incorrectly typed as singlular `Name()`s during MDEV-33526.
Under `Name`s’ 64-char limit, they could overflow
(read: truncate) even before their lengths got absurd.

In response to `‘MAX_SLAVE_ERRMSG’ was not declared in this scope` in
Embedded builds, a new `#ifdef HAVE_REPLICATION` guard wraps
`slave_status_info` to skip this unused data in Replication-less builds.

For testing, this commit forward-ports a modified cherry-pick of #3795
(the latter targets our oldest maintained LTS as part of MDEV-35948).

> Assert that 1st-gen `replicate_*` filter variables display
> their input – including long but reasonable lists –
> correctly (without truncation) in
> * direct SELECT
> * [semi-new] INFORMATION_SCHEMA.GLOBAL_VARIABLES.VARIABLE_VALUE
> * [new] SHOW REPLICA STATUS

Reviewed-by: Brandon Nesterenko <brandon.nesterenko@mariadb.com>

2025-01-31 20:56:41 -07:00

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