maropu commented on pull request #31639:
URL: https://github.com/apache/spark/pull/31639#issuecomment-785479023
> Change the table struct reodoring the struct
ALTER TABLE test_struct CHANGE COLUMN sub sub STRUCT < b:STRING,a :INT>;
Really? It seems the operation cannot be allowd;
```
scala> sql("""ALTER TABLE test_struct CHANGE COLUMN sub sub STRUCT <
b:STRING,a :INT>;""")
org.apache.spark.sql.AnalysisException: ALTER TABLE CHANGE COLUMN is not
supported for changing column 'sub' with type
'StructType(StructField(a,IntegerType,true), StructField(b,StringType,true))'
to 'sub' with type 'StructType(StructField(b,StringType,true),
StructField(a,IntegerType,true))'
```
https://github.com/apache/spark/blob/b17754a8cbd2593eb2b1952e95a7eeb0f8e09cdb/sql/core/src/main/scala/org/apache/spark/sql/execution/command/ddl.scala#L351-L357
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