MaxGekk commented on pull request #30979:
URL: https://github.com/apache/spark/pull/30979#issuecomment-752915631


   I am going to open another PR to solve the issue of caching only:
   ```sql
   spark-sql> CREATE TABLE tbl1 (col0 int, part0 int) USING parquet PARTITIONED 
BY (part0);
   spark-sql> INSERT INTO tbl1 PARTITION (part0=0) SELECT 0;
   spark-sql> INSERT INTO tbl1 PARTITION (part0=1) SELECT 1;
   spark-sql> CACHE TABLE tbl1;
   spark-sql> SELECT * FROM tbl1;
   0    0
   1    1
   spark-sql> ALTER TABLE tbl1 DROP PARTITION (part0=0);
   spark-sql> SELECT * FROM tbl1;
   0    0
   1    1
   ```
   The issue of outdated file indexes is more complex, and demands a proper 
solution.


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