[IMPALA-11200] Redundant additions to ExecOption field in query profile of grouping aggregator node when inside a subplan - ASF JIRA

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Details

Type: Bug
Status: Resolved
Priority: Major
Resolution: Fixed
Affects Version/s: None
Fix Version/s: Impala 4.1.0
Component/s: None
Labels:
None

Epic Color:
ghx-label-10

Description

There is an excessive addition of "Codegen Enabled" text to "ExecOption" field in the query profile when a grouping agg is a part of a subplan that is created to unnest a complex type.
I was able to reproduce this using one of the queries we used for end to end testing:

use tpch_nested_parquet;
select c_custkey, v.* from customer c,
  (select o_orderpriority, count(o_orderkey) c, sum(o_totalprice) s,
          avg(o_totalprice) a, max(o_orderstatus) mx,
          min(o_orderdate) mn
   from c.c_orders
   group by o_orderpriority) v
where c_custkey < 4;

From the query profile:

     AGGREGATION_NODE (id=4):
             - InactiveTotalTime: 0.000ns
             - PeakMemoryUsage: 36.04 MB (37794944)
             - RowsReturned: 0 (0)
             - RowsReturnedRate: 0
             - TotalTime: 1.571ms
            GroupingAggregator 0:
              ExecOption: Codegen Enabled, Codegen Enabled, Codegen Enabled       <== THIS PART!
               - BuildTime: 68.253us
               - GetResultsTime: 72.634us

The reason this happens is because "Codegen Enabled" is added to the ExecOption everytime the agg node is Opened as a result of the subplan being called again and again to unnest.