maropu commented on pull request #29010:
URL: https://github.com/apache/spark/pull/29010#issuecomment-654219970
Thanks for your contribution, @StefanXiepj ! btw, which Spark version you
used? I think the current master does not accept the alter command;
```
scala> sql("""alter table cast_exception_test change column c1 c1 string""")
org.apache.spark.sql.AnalysisException: ALTER TABLE CHANGE COLUMN is not
supported for changing column 'c1' with type 'IntegerType' to 'c1' with type
'StringType';
```
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