If using statement based replication (SBR), repeatedly calling
statements which are unsafe for SBR will cause a warning message
to be written to the error for each statement. This might lead
to filling up the error log and there is no way to disable this
behavior.

The solution is to only log these message (about statements unsafe
for statement based replication) if the log_warnings option is set.

For example:

SET GLOBAL LOG_WARNINGS = 0;
INSERT INTO t1 VALUES(UUID());
SET GLOBAL LOG_WARNINGS = 1;
INSERT INTO t1 VALUES(UUID());

In this case the message will be printed only once:

[Warning] Statement may not be safe to log in statement format.
          Statement: INSERT INTO t1 VALUES(UUID())

mysql-test/suite/binlog/r/binlog_stm_unsafe_warning.result:
  Add test case result for Bug#46265
mysql-test/suite/binlog/t/binlog_stm_unsafe_warning-master.opt:
  Make log_error value available.
mysql-test/suite/binlog/t/binlog_stm_unsafe_warning.test:
  Add test case for Bug#46265
sql/sql_class.cc:
  Print warning only if the log_warnings is enabled.