Describe the bug
Could not find rte error when using path variable in WHERE

How are you accessing AGE (Command line, driver, etc.)?

• terminal

What data setup do we need to do?

SELECT * FROM cypher('graph',$$
    CREATE (n)-[:KNOWS {n:'hello'}]->({n:'hello'})
$$) as (a agtype);

What is the command that caused the error?

SELECT * FROM cypher('graph', $$
    MATCH p = (m)-[]->(b) 
    WHERE length(p) >1
    RETURN p
$$) AS (pattern agtype);

ERROR:  could not find rte for p
LINE 3:     WHERE length(p) >1 return p
                         ^

Expected behavior
Expected it to work without error.

Environment (please complete the following information):

• latest (PG13 master)