Github user dongjoon-hyun commented on a diff in the pull request:

    https://github.com/apache/spark/pull/19911#discussion_r155328166
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/jdbc/PostgresDialect.scala ---
    @@ -100,5 +100,5 @@ private object PostgresDialect extends JdbcDialect {
     
       }
     
    -  override def isCascadingTruncateTable(): Option[Boolean] = Some(true)
    +  override def isCascadingTruncateTable(): Option[Boolean] = Some(false)
    --- End diff --
    
    @bolkedebruin .
    
    Originally, Spark uses `DROP TABLE` for Overwrite mode. #14086 introduced 
`TRUNCATE` operation when `JdbcUtils.isCascadingTruncateTable(url) == 
Some(false)`. 
    
    So, for PostgresDialect, Spark doesn't use TRUNCATE here.


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