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Posted to issues-all@impala.apache.org by "Csaba Ringhofer (Jira)" <ji...@apache.org> on 2021/10/20 20:41:05 UTC

[jira] [Created] (IMPALA-10979) Reduce pre-aggregation memory if cardinality is very low

Csaba Ringhofer created IMPALA-10979:
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             Summary: Reduce pre-aggregation memory if cardinality is very low
                 Key: IMPALA-10979
                 URL: https://issues.apache.org/jira/browse/IMPALA-10979
             Project: IMPALA
          Issue Type: Bug
          Components: Backend, Frontend
            Reporter: Csaba Ringhofer


From an execution summery an aggregation:
#Rows  Est. #Rows    Peak Mem  Est. Peak Mem
0           0                  34.04 MB     128.00 MB

While we knew exactly the 0 rows will arrive (due to scan node child with 0 files) we still allocated 34.04 MB of memory.



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