Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/21818#discussion_r203934987
  
    --- Diff: 
sql/core/src/test/scala/org/apache/spark/sql/sources/InsertSuite.scala ---
    @@ -486,6 +486,25 @@ class InsertSuite extends DataSourceTest with 
SharedSQLContext {
           }
         }
       }
    +  test("SPARK-24860: dynamic partition overwrite specified per source 
without catalog table") {
    +    withTempPath { path =>
    +      Seq((1, 1, 1)).toDF("i", "part1", "part2")
    --- End diff --
    
    can we simplify the test? ideally we only need one partition column, and 
write some initial data to the table. then do an overwrite with 
partitionOverwriteMode=dynamic, and another overwrite with 
partitionOverwriteMode=static.


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