Github user gatorsmile commented on a diff in the pull request:

    https://github.com/apache/spark/pull/22466#discussion_r222855237
  
    --- Diff: 
sql/core/src/test/scala/org/apache/spark/sql/execution/command/DDLSuite.scala 
---
    @@ -407,6 +407,7 @@ abstract class DDLSuite extends QueryTest with 
SQLTestUtils {
     
       test("create a managed table with the existing non-empty directory") {
         withTable("tab1") {
    +      Utils.createDirectory(spark.sessionState.conf.warehousePath)
    --- End diff --
    
    Why do we need to create the directory first?


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