[jira] [Created] (IMPALA-5641) mem-estimate should never be less than mem-reservation

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

Tim Armstrong created IMPALA-5641:
-------------------------------------

             Summary: mem-estimate should never be less than mem-reservation
                 Key: IMPALA-5641
                 URL: https://issues.apache.org/jira/browse/IMPALA-5641
             Project: IMPALA
          Issue Type: Improvement
          Components: Frontend
            Reporter: Tim Armstrong
            Assignee: Tim Armstrong
            Priority: Minor


Once we switch over to the new buffer pool, the mem-reservation is a hard floor for the actual memory consumption. The planner's resource profiles should reflect this, instead of reporting things like this:

{code}
02:HASH JOIN [LEFT OUTER JOIN]
|  hash predicates: 2 + a.id = b.id - 2
|  fk/pk conjuncts: assumed fk/pk
|  other join predicates: a.int_col <= b.bigint_col + 97, a.int_col >= 0 + b.bigint_col
|  other predicates: CAST(b.double_col AS DECIMAL(3,2)) > 11.1
|  mem-estimate=15.68KB mem-reservation=136.00MB
{code}



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