override def inputTypes: Seq[AbstractDataType] = Seq()

in src/main/scala/org/apache/spark/sql/datasketches/kll/aggregate/KllDoublesSketchAggBuild.scala [107:125]

• 14 lines of code
• 9 McCabe index (conditional complexity)

  override def inputTypes: Seq[AbstractDataType] = Seq(NumericType, IntegerType)

  override def checkInputDataTypes(): TypeCheckResult = {
    // k must be a constant
    if (!kExpr.foldable) {
      return TypeCheckResult.TypeCheckFailure(s"k must be foldable, but got: ${kExpr}")
    }
    // Check if k >= 8 and k <= MAX_K
    kExpr.eval() match {
      case k: Int if k >= 8 && k <= KllSketch.MAX_K => // valid state, do nothing
      case k: Int if k > KllSketch.MAX_K => return TypeCheckResult.TypeCheckFailure(
        s"k must be less than or equal to ${KllSketch.MAX_K}, but got: $k")
      case k: Int => return TypeCheckResult.TypeCheckFailure(s"k must be at least 8 and no greater than ${KllSketch.MAX_K}, but got: $k")
      case _ => return TypeCheckResult.TypeCheckFailure(s"Unsupported input type ${kExpr.dataType.catalogString}")
    }

    // additional validations of k handled in the DataSketches library
    TypeCheckResult.TypeCheckSuccess
  }