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

    https://github.com/apache/spark/pull/12252#discussion_r59819746
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JdbcUtils.scala
 ---
    @@ -246,13 +247,23 @@ object JdbcUtils extends Logging {
       }
     
       /**
    +   * The utility to add quote to the column name based on its dialect
    +   * @param dialect the JDBC dialect
    +   * @param columnName the input column name
    +   * @return the quoted column name
    +   */
    +  private def quoteColumnName(dialect: JdbcDialect, columnName: String): 
String = {
    +    dialect.quoteIdentifier(columnName)
    +  }
    +
    +  /**
        * Compute the schema string for this RDD.
        */
    -  def schemaString(df: DataFrame, url: String): String = {
    +  def schemaString(dialect: JdbcDialect, df: DataFrame, url: String): 
String = {
         val sb = new StringBuilder()
         val dialect = JdbcDialects.get(url)
    --- End diff --
    
    The purpose to pass in dialect is to get proper quote for columns based on 
its data source. Any suggestion? 


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