The sql statement "evaluate length('abc') into var_len;" does not work in wellshell

Description: The sql statement "evaluate length('abc') into var_len;" does not work in wellshell.

Test Version: 8.4.0.1008

Test Step:

cubrid> status
cubrid>

Current user : dba
Current database : demodb
Server version : 8.4.0.1008
Client version : 8.4.0
cubrid> evaluate length('abc') into var_len;
Command executed. (0.00 sec)

cubrid>
cubrid> select var_len;
Error -494: Semantic: var_len is not defined. select var_len

cubrid>

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The expected result likes below:
csql> evaluate length('abc') into var_len;

=== <Result of EVALUATE Command in Line 1> ===

Result
=============
3

Current transaction has been committed.

1 command(s) successfully processed.
csql> select var_len;

=== <Result of SELECT Command in Line 1> ===

var_len
=============
3

1 rows selected.

Current transaction has been committed.

1 command(s) successfully processed.
csql>