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

    https://github.com/apache/spark/pull/6577#discussion_r31497802
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/jdbc/JdbcDialects.scala ---
    @@ -80,6 +80,15 @@ abstract class JdbcDialect {
        * @return The new JdbcType if there is an override for this DataType
        */
       def getJDBCType(dt: DataType): Option[JdbcType] = None
    +
    +  /**
    +   * Enclose column name
    +   * @param colName The coulmn name
    +   * @return Enclosed column name
    +   */
    +  def columnEnclosing(colName: String): String = {
    +    colName.split('.').map(c => s""""$c"""").mkString(".")
    --- End diff --
    
    hmm, can't we have sql like "SELECT column.table FROM table"? I think it is 
correct sql query?


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