a 'select' query from sqllogictest takes very long time to run and sometimes results in timeout

[jennifersp]

This is the first query that takes very long time or sometimes it times out.
Broke down the result received from running the logic test:
The query:

SELECT x46,x29,x34,x16,x21,x31,x17,x40,x4,x56,x26,x27,x45,x2,x20,x41,x28,x36,x37,x7,x23,x64,x18,x22,x33,x61,x24,x54,x9,x48 
FROM t45,t27,t37,t36,t7,t24,t34,t9,t46,t61,t16,t48,t28,t23,t54,t40,t22,t2,t31,t41,t20,t18,t17,t56,t33,t4,t26,t64,t21,t29
WHERE a31=b33   AND a4=b40   AND a54=b9   AND b4=a34   AND b16=a20   AND a21=b7   AND a29=b34   AND a45=3   AND a2=b23   AND a37=b36   AND a16=b46   AND a56=b29   AND a9=b22   AND a7=b48   AND a24=b28   AND a18=b17   AND b61=a46   AND b21=a17   AND b56=a27   AND b41=a48   AND a61=b64   AND b54=a28   AND b20=a23   AND b24=a40   AND b2=a41   AND a64=b37   AND b27=a26   AND b18=a45   AND b31=a22   AND b26=a36;

It is at sqllogictest/test/select5.test:9978, and it executed with duration of 1200001ms before it timed out.