Rasql_corridor query hangs server up

[Bang Pham Huu]

stop_rasdaman.sh first then start_rasdaman.sh

rasql -q 'select encode(clip(c, corridor(projection(0,1), linestring(0 1 1, 1 1 1, 3 1 1), polygon((0 2, 2 0, 2 2)))), "csv") from test_eobstest as c' --out string

with sdom of test_eobstest is [0:5,0:29,0:39].

Then rasql console hangs for a long time (more than 3 minutes) and cannot finish.

Opening database RASBASE at localhost:7001... ok.
Executing retrieval query... 

in rasserver's log

 [INFO] - 2018-07-31 15:10:12,324: Request: 'select encode(clip(c, corridor(projection(0,1), linestring(0 1 1, 1 1 1, 3 1 1), polygon((0 2, 2 0, 2 2)))), "csv") from test_eobstest as c'... parsing... checking semantics... evaluating...