I can run your code in the shell with -test.cc without the a problem, but when I created a function with it in impala, it is not working, only lines I added are: 87 StringVal result; 88 percentile->values->sort(); 89 90 std::cerr << "Sorted list:" << endl; 91 for (std::list<double>::iterator it = percentile->values->begin(); it != percentile->values->end(); it++) 92 std::cerr << *it << ' '; 93 std::cerr << "\n===Sorted list:" << endl; 94 95 int n = percentile->percent * (percentile->nb - 1); 96 std::list<double>::iterator it = percentile->values->begin(); from 90-93, to see if the list sorted correctly. impalad.INFO ..... I0701 12:15:43.854324 30959 plan-fragment-executor.cc:190] descriptor table for fragment=7b405b9a021d464a:6b# # A fatal error has been detected by the Java Runtime Environment: # # SIGSEGV (0xb) at pc=0x00007fb42a30ba3c, pid=27281, tid=140411399993088 # # JRE version: Java(TM) SE Runtime Environment (7.0_67-b01) (build 1.7.0_67-b01) # Java VM: Java HotSpot(TM) 64-Bit Server VM (24.65-b04 mixed mode linux-amd64 compressed oops) # Problematic frame: # C [libudapctL.27281.0.so+0x3a3c] std::list<double, std::allocator<double> >::merge(std::list<double, std::allocator<double> >&)+0x80 # # Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again # # An error report file with more information is saved as: # /var/run/cloudera-scm-agent/process/411-impala-IMPALAD/hs_err_pid27281.log # # If you would like to submit a bug report, please visit: # http://bugreport.sun.com/bugreport/crash.jsp # 5b38a813715cac .... imalapd.ERROR E0701 12:15:45.940914 9620 logging.cc:119] stderr will be logged to this file. call PercentUpdate: call PercentUpdate: call PercentUpdate: call PercentUpdate: call PercentUpdate: call PercentUpdate: call PercentUpdate: call PercentUpdate: call PercentSerialize: call PercentMerge: call PercentMerge: My data set have more the 20 elements, seems like to read up 1/3 then start to serialize it, and merge the result, but error out there. Did you ever had this problem? Seems like
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