Github user JoshRosen commented on a diff in the pull request: https://github.com/apache/spark/pull/14777#discussion_r76332385 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/literals.scala --- @@ -251,8 +251,21 @@ case class Literal (value: Any, dataType: DataType) extends LeafExpression with case (v: Short, ShortType) => v + "S" case (v: Long, LongType) => v + "L" // Float type doesn't have a suffix - case (v: Float, FloatType) => s"CAST($v AS ${FloatType.sql})" - case (v: Double, DoubleType) => v + "D" + case (v: Float, FloatType) => + val castedValue = v match { + case _ if v.isNaN => "'NaN'" + case Float.PositiveInfinity => "'Infinity'" + case Float.NegativeInfinity => "'-Infinity'" + case _ => v + } + s"CAST($castedValue AS ${FloatType.sql})" + case (v: Double, DoubleType) => + v match { + case _ if v.isNaN => s"CAST('NaN' AS ${DoubleType.sql})" + case Double.PositiveInfinity => s"CAST('Infinity' AS ${DoubleType.sql})" + case Double.NegativeInfinity => s"CAST('-Infinity' AS ${DoubleType.sql})" + case _ => v + "D" + } case (v: Decimal, t: DecimalType) => s"CAST($v AS ${t.sql})" --- End diff -- BigDecimal literals are a good idea. Given that there are multiple overlapping / complimentary approaches here, I think we should fork this discussion and defer any decimal changes to a separate PR.
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