MariaDB still uses tx_isolation for transaction isolation unlike MySQL 8+ which uses transaction_isolation #3620
Description
The following unit tests are failing with MariaDB
testSessionTransaction: setTransactionIsolation():MySQL: [MySQL]: [Comment]: mysql_stmt_prepare error [mysql_stmt_error]: Unknown system variable 'transaction_isolation' [mysql_stmt_errno]: 1193 [mysql_stmt_sqlstate]: HY000 [statemnt]: SELECT @@transaction_isolation
setTransactionIsolation():MySQL: [MySQL]: [Comment]: mysql_stmt_prepare error [mysql_stmt_error]: Unknown system variable 'transaction_isolation' [mysql_stmt_errno]: 1193 [mysql_stmt_sqlstate]: HY000 [statemnt]: SELECT @@transaction_isolation
setTransactionIsolation():MySQL: [MySQL]: [Comment]: mysql_stmt_prepare error [mysql_stmt_error]: Unknown system variable 'transaction_isolation' [mysql_stmt_errno]: 1193 [mysql_stmt_sqlstate]: HY000 [statemnt]: SELECT @@transaction_isolation
setTransactionIsolation():MySQL: [MySQL]: [Comment]: mysql_stmt_prepare error [mysql_stmt_error]: Unknown system variable 'transaction_isolation' [mysql_stmt_errno]: 1193 [mysql_stmt_sqlstate]: HY000 [statemnt]: SELECT @@transaction_isolation
testTransaction: setTransactionIsolation():MySQL: [MySQL]: [Comment]: mysql_stmt_prepare error [mysql_stmt_error]: Unknown system variable 'transaction_isolation' [mysql_stmt_errno]: 1193 [mysql_stmt_sqlstate]: HY000 [statemnt]: SELECT @@transaction_isolation
setTransactionIsolation():MySQL: [MySQL]: [Comment]: mysql_stmt_prepare error [mysql_stmt_error]: Unknown system variable 'transaction_isolation' [mysql_stmt_errno]: 1193 [mysql_stmt_sqlstate]: HY000 [statemnt]: SELECT @@transaction_isolation