7mming7 created SPARK-44654:
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Summary: In subquery cannot perform partition pruning
Key: SPARK-44654
URL: https://issues.apache.org/jira/browse/SPARK-44654
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.0.0
Reporter: 7mming7
The following SQL cannot perform partition pruning
{code:java}
SELECT * FROM parquet_part WHERE id_type in (SELECT max(id_type) from
parquet_part){code}
As can be seen from the execution plan below, the partition pruning of left
cannot be performed after the subquery of in is converted into join
!image-2023-08-03-17-17-34-858.png!
The current issue proposes to optimize insubquery. Only when the value of in is
greater than a threshold, insubquery will be converted into Join
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