Query with inline function does not produce VISUAL plan,but explain & executes fine.

create a bucket b1;

create primary index on b1;

insert into b1 values(UUID(), {"a":1})

CREATE FUNCTION func(vEmail) { (select * from `travel-sample` where type = vEmail limit 1)};

select func('hotel')
from b1;

EXPLAIN: 

Internal error generating query plan: Error: Parse error on line 1:
default:func("hotel")
-------^
Expecting 'EOF', 'SEMI', 'STAR', 'DOT', 'EQ', 'IN', 'WITHIN', 'NOT', 'LBRACKET', 'PLUS', 'MINUS', 'DIV', 'MOD', 'CONCAT', 'AND', 'OR', 'DEQ', 'NE', 'LT', 'GT', 'LE', 'GE', 'BETWEEN', 'LIKE', 'IS', got 'COLON'