Alexey Yurchenko e238246872 MDEV-37494 Diagnostics_area does not always contain apply error info ...

It appears that some error conditions don't store error information in the
Diagnostics_area. For example when table_def::compatible_with() check fails
error message is stored in Relay_log_info instead.
This results in optimistically identical votes and zero error buffer size
breaks wsrep-lib logic as it relies on error buffer size to decide whether
voting took place.
To account for this, first try to obtain error info from Diagnostics_area,
then fallback to Relay_log_info. If that fails use some "random" data to
distinguish this condition from success in production.

2025-09-15 16:48:10 +02:00

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