Lookup limit pushdown might crash storaged when running concurrently

[xiajingchun]

Prerequisite:

1. set query_concurrently=true in storaged conf.
2. :play nba to create the nba space.

run below shell will crash storaged

echo "start to run"
for i in `seq 1 10`
do
    echo $i; ./nebula-console -addr <ip> -port <port> -u root -p nebula -e "use nba; LOOKUP ON like YIELD like.likeness as likeness | ORDER BY \$-.likeness | Limit 2" &
done
wait
echo "done"

Your Environments (required)

• OS: uname -a
• Compiler: g++ --version or clang++ --version
• CPU: lscpu
• Commit id (e.g. a3ffc7d8)

How To Reproduce(required)

Steps to reproduce the behavior:

refer to the description.

Expected behavior

Storaged won't crash.

Additional context

[Sophie-Xie]

Fixed in #4288