Github user maropu commented on the issue:
https://github.com/apache/spark/pull/16410
This fix change some existing behaviour in datasource.
For instance,
```
scala> sql("""CREATE TABLE testTable(a INT, b INT, c INT, d INT) USING
PARQUET PARTITIONED BY (b, c)""")
scala> sql("""INSERT INTO TABLE testTable PARTITION (b=14, c) SELECT 13,
15, 16""").explain
scala> sql("""SELECT * FROM testTable""").show
```
```
// A new column ordering
+---+---+---+---+
| a| b| c| d|
+---+---+---+---+
| 13| 14| 15| 16|
+---+---+---+---+
```
```
// An old column ordering
+---+---+---+---+
| a| d| b| c|
+---+---+---+---+
| 13| 15| 14| 16|
+---+---+---+---+
```
I'm not sure this is acceptable, so welcome any advices.
cc: @cloud-fan
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