[jira] [Created] (IMPALA-5885) Parquet scanner does not free local allocations in filter contexts

["Tim Armstrong (JIRA)" <ji...@apache.org>]

Tim Armstrong created IMPALA-5885:
-------------------------------------

             Summary: Parquet scanner does not free local allocations in filter contexts
                 Key: IMPALA-5885
                 URL: https://issues.apache.org/jira/browse/IMPALA-5885
             Project: IMPALA
          Issue Type: Bug
          Components: Backend
    Affects Versions: Impala 2.8.0, Impala 2.6.0, Impala 2.7.0, Impala 2.9.0, Impala 2.10.0
            Reporter: Tim Armstrong
            Assignee: Tim Armstrong


This problem can occur if runtime filter expressions that are evaluated in the scan allocate temporary memory - "local allocations". These accumulate for each scan range and are only 
freed upon scan range completion. 

A contrived query that exhibits the problem is the following. If I continue adding upper() and lower() to the expression the memory consumption of the scan node will continue to grow - up to 100MB for each extra function call!

{code}
set runtime_filter_wait_time_ms=1000000;
select straight_join count(*) from tpch_parquet.lineitem l1 join tpch_parquet.lineitem l2 on upper(lower(upper(lower(l1.l_comment)))) = concat(l2.l_comment, 'foo');
summary;
{code}

I think other conjuncts in the scanner may be affected by the same problem, e.g. the min_max conjuncts.



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