Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/14313#discussion_r72005085 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JDBCRDD.scala --- @@ -322,46 +322,135 @@ private[sql] class JDBCRDD( } } - // Each JDBC-to-Catalyst conversion corresponds to a tag defined here so that - // we don't have to potentially poke around in the Metadata once for every - // row. - // Is there a better way to do this? I'd rather be using a type that - // contains only the tags I define. - abstract class JDBCConversion - case object BooleanConversion extends JDBCConversion - case object DateConversion extends JDBCConversion - case class DecimalConversion(precision: Int, scale: Int) extends JDBCConversion - case object DoubleConversion extends JDBCConversion - case object FloatConversion extends JDBCConversion - case object IntegerConversion extends JDBCConversion - case object LongConversion extends JDBCConversion - case object BinaryLongConversion extends JDBCConversion - case object StringConversion extends JDBCConversion - case object TimestampConversion extends JDBCConversion - case object BinaryConversion extends JDBCConversion - case class ArrayConversion(elementConversion: JDBCConversion) extends JDBCConversion + // A `JDBCConversion` is responsible for converting a value from `ResultSet` + // to a value in a field for `InternalRow`. + private type JDBCConversion = (ResultSet, Int) => Any --- End diff -- also explain what's the 2 arguments in the comment?
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