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https://issues.apache.org/jira/browse/SPARK-41940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17655779#comment-17655779
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Apache Spark commented on SPARK-41940:
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User 'wankunde' has created a pull request for this issue:
https://github.com/apache/spark/pull/39457
> 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
> 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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