Quanlong Huang created IMPALA-12204:
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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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