[jira] [Created] (IMPALA-12204) Redundant codegen info of HashJoinBuilder inside a subplan

["Quanlong Huang (Jira)" <ji...@apache.org>]

Quanlong Huang created IMPALA-12204:
---------------------------------------

             Summary: Redundant codegen info of HashJoinBuilder inside a subplan
                 Key: IMPALA-12204
                 URL: https://issues.apache.org/jira/browse/IMPALA-12204
             Project: IMPALA
          Issue Type: Bug
          Components: Backend
            Reporter: Quanlong Huang
            Assignee: Quanlong Huang


In query profile, the info strings of a hash join builder contains an ExecOption that has content like "Build Side Codegen Enabled, Hash Table Construction Codegen Enabled". When there is a HashJoin node inside a SUBPLAN node, this string could be repeated many times since the SUBPLAN node open and close the right child many times. This could blow up the profile size.

I can reproduce this by the following query:
{code:sql}
select count(*) from
  tpch_nested_parquet.customer c1,
  tpch_nested_parquet.customer c2,
  (select x.* from c1.c_orders x, c2.c_orders y
  where x.o_orderkey = y.o_orderkey) v
where c1.c_custkey = c2.c_custkey;{code}
In the query plan, there is a HASH JOIN node inside a SUBPLAN node:
{noformat}
08:SUBPLAN
|  row-size=56B cardinality=1.50M
|
|--06:NESTED LOOP JOIN [CROSS JOIN]
|  |  row-size=56B cardinality=10
|  |
|  |--02:SINGULAR ROW SRC
|  |     row-size=40B cardinality=1
|  |
|  05:HASH JOIN [INNER JOIN]
|  |  hash predicates: x.o_orderkey = y.o_orderkey
|  |  row-size=16B cardinality=10
|  |
|  |--04:UNNEST [c2.c_orders y]
|  |     row-size=0B cardinality=10
|  |
|  03:UNNEST [c1.c_orders x]
|     row-size=0B cardinality=10
 {noformat}
The query porfile has super long strings:
{noformat}
Hash Join Builder (join_node_id=5):
  ExecOption: Build Side Codegen Enabled, Hash Table Construction Codegen Enabled, Build Side Codegen Enabled, Hash Table Construction Codegen Enabled,...
{noformat}



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