Github user aokolnychyi commented on the issue:
https://github.com/apache/spark/pull/19252
@gatorsmile thanks for the feedback. I also covered
``TruncateTableCommand`` with additional tests. However, I see a bit strange
behavior while creating a test for ``AlterTableAddPartitionCommand ``.
```
sql(s"CREATE TABLE t1 (col1 int, col2 int) USING PARQUET")
sql(s"INSERT INTO TABLE t1 SELECT 1, 2")
sql(s"INSERT INTO TABLE t1 SELECT 2, 4")
sql("SELECT * FROM t1").show()
+----+----+
|col1|col2|
+----+----+
| 1| 2|
| 2| 4|
+----+----+
sql(s"CREATE TABLE t2 (col1 int, col2 int) USING PARQUET PARTITIONED BY
(col1)")
sql(s"INSERT INTO TABLE t2 SELECT 1, 2")
sql(s"INSERT INTO TABLE t2 SELECT 2, 4")
sql("SELECT * FROM t2").show()
+----+----+
|col2|col1|
+----+----+
| 2| 4|
| 1| 2|
+----+----+
```
Why are the results different? Is it a bug?
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