With this index
CREATE INDEX IDX_table_char ON table computed by (cast(integer_field
as varchar(10)));
this query works with PLAN (P_UCM_T INDEX (IDX_TABLE_CHAR))

SELECT * FROM table where cast(CODIGO as varchar(10)) like '21095%'

But this query

SELECT * FROM table where integer_field like '21095%'

Use PLAN NATURAL, how can index this field?

Regards