yaooqinn commented on pull request #31322:
URL: https://github.com/apache/spark/pull/31322#issuecomment-766833399
```sql
spark-sql> drop table ppp;
spark-sql> create table ppp(i string, j string) using parquet partitioned by
(j);
spark-sql>
> INSERT OVERWRITE ppp VALUES ('1', null);
21/01/25 21:55:03 WARN log: Updating partition stats fast for: ppp
21/01/25 21:55:03 WARN log: Updated size to 396
spark-sql> alter table ppp drop partition(j=null);
Error in query: No partition is dropped. One partition spec 'Map(j -> null)'
does not exist in table 'ppp' database 'default';
spark-sql> select version();
3.0.1 2b147c4cd50da32fe2b4167f97c8142102a0510d
spark-sql>
```
I also test the 3.0.1 release, might not be just in-memory catalog?
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