elsa0520 commented on issue #28868:
URL: https://github.com/apache/doris/issues/28868#issuecomment-1892055824

   The order by operator is a blocking operator which means Doris need to load 
all of data (include all columns) in memory.
   100KB * 150K rows = 15000000 kb => 15G 
   The error message " process memory used 180.24 GB exceed limit 151.01 GB or 
sys available memory 38.30 GB less than low water mark 16.00 GB. "
   May be your process is running other query which already cost lots of memory.
   So could your please only run this query and confirm memory used by this 
query ?


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