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In this PR da35142

GetDBUri() will execute a statement such as the following:

set transaction_isolation = 'repeatable-read';

This variable was only introduced in MySQL 5.7.20, so if you are using an earlier version such as what Aurora 5.7 is, it will result in an error:

mysql> set transaction_isolation = 'repeatable-read';
ERROR 1193 (HY000): Unknown system variable 'transaction_isolation'

Instead the statement needs to be set tx_isolation = 'repeatable-read', but this statement is not supported by MySQL 8.0. So some version-specific logic is probably required.