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https://issues.apache.org/jira/browse/SPARK-33591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17277202#comment-17277202
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Apache Spark commented on SPARK-33591:
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User 'gengliangwang' has created a pull request for this issue:
https://github.com/apache/spark/pull/31439
> NULL is recognized as the "null" string in partition specs
> ----------------------------------------------------------
>
> Key: SPARK-33591
> URL: https://issues.apache.org/jira/browse/SPARK-33591
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: Maxim Gekk
> Assignee: Maxim Gekk
> Priority: Major
> Labels: correctness
> Fix For: 3.0.2, 3.2.0, 3.1.1
>
>
> For example:
> {code:sql}
> spark-sql> CREATE TABLE tbl5 (col1 INT, p1 STRING) USING PARQUET PARTITIONED
> BY (p1);
> spark-sql> INSERT INTO TABLE tbl5 PARTITION (p1 = null) SELECT 0;
> spark-sql> SELECT isnull(p1) FROM tbl5;
> false
> {code}
> The *p1 = null* is not recognized as a partition with NULL value.
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