[jira] [Assigned] (SPARK-41940) Infer IsNotNull constraints for complex join expressions

["Apache Spark (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-41940?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-41940:
------------------------------------

    Assignee: Apache Spark

> Infer IsNotNull constraints for complex join expressions
> --------------------------------------------------------
>
>                 Key: SPARK-41940
>                 URL: https://issues.apache.org/jira/browse/SPARK-41940
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.4.0
>            Reporter: Wan Kun
>            Assignee: Apache Spark
>            Priority: Major
>
> Infer IsNotNull constraints for complex join expressions could help filter a lot of rows before join.
> For example,
> {code:sql}
> CREATE TABLE t(id int, text string) using parquet;
> SELECT *
> FROM t as t1
> LEFT JOIN t as t2
> ON t1.text = get_json_object(t2.text, '$.not_exists_col');
> {code}
> we can infer *IsNotNull(get_json_object(t2.text, '$.not_exists_col'))* constraint along with *IsNotNull(t2.text)* to filter a lot of rows for the right side of the join.



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