Github user jiangxb1987 commented on the issue:
https://github.com/apache/spark/pull/15717
> The column change command will only modify Hive's metadata, and will not
modify data. Users should make sure the actual data layout of the
table/partition conforms with the metadata definition.
Hive requires the user to ensure that, after the column change, the
metadata is still valid on current data set. This is useful in certain
conditions, e.g. A column may be created with its dataType as `Int` but some
times later the column number grows bigger and should be changed to a Long
column.
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