Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/16944
Hi, @budde and @cloud-fan .
I met the following situation with Apache master after this commit. Could
you check the following case? Previously, Apache Spark shows the correct result.
```scala
sql("CREATE TABLE t1(a string, b string) PARTITIONED BY (day string, hour
string) STORED AS PARQUET").show
sql("INSERT INTO TABLE t1 PARTITION (day = '1', hour = '01' ) VALUES (100,
200)").show
sql("SELECT a, b FROM t1").show
+---+---+
| a| b|
+---+---+
|100|200|
+---+---+
```
```sql
hive> ALTER TABLE t1 ADD COLUMNS (dummy string);
```
```scala
sql("SELECT a, b FROM t1").show
org.apache.hadoop.hive.ql.metadata.HiveException: Unable to alter table.
partition keys can not be changed.
...
+---+----+
| a| b|
+---+----+
|100|null|
+---+----+
```
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