def foldFilter()

in src/spark-project/spark-common/src/main/scala/org/apache/spark/sql/execution/datasource/FilePruner.scala [660:719]
53 lines of code
25 McCabe index (conditional complexity)

  def foldFilter(filter: Filter): Filter = {
    filter match {
      case EqualTo(_, value: Any) =>
        insurance(value) {
          ts => Trivial(ts >= start && ts < end)
        }
      case In(_, values: Array[Any]) =>
        val satisfied = values.map(v => insurance(v) {
          ts => Trivial(ts >= start && ts < end)
        }).exists(_.equals(Trivial(true)))
        Trivial(satisfied)

      case IsNull(_) =>
        Trivial(false)
      case IsNotNull(_) =>
        Trivial(true)
      case GreaterThan(_, value: Any) =>
        insurance(value) {
          ts => Trivial(ts < end)
        }
      case GreaterThanOrEqual(_, value: Any) =>
        insurance(value) {
          ts => Trivial(ts < end)
        }
      case LessThan(_, value: Any) =>
        insurance(value) {
          ts => Trivial(ts > start)
        }
      case LessThanOrEqual(_, value: Any) =>
        insurance(value) {
          ts => Trivial(ts >= start)
        }
      case And(left: Filter, right: Filter) =>
        And(foldFilter(left), foldFilter(right)) match {
          case And(Trivial(false), _) => Trivial(false)
          case And(_, Trivial(false)) => Trivial(false)
          case And(Trivial(true), right) => right
          case And(left, Trivial(true)) => left
          case other => other
        }
      case Or(left: Filter, right: Filter) =>
        Or(foldFilter(left), foldFilter(right)) match {
          case Or(Trivial(true), _) => Trivial(true)
          case Or(_, Trivial(true)) => Trivial(true)
          case Or(Trivial(false), right) => right
          case Or(left, Trivial(false)) => left
          case other => other
        }
      case trivial: Trivial =>
        trivial
      case unsupportedFilter =>
        // return 'true' to scan all partitions
        // currently unsupported filters are:
        // - StringStartsWith
        // - StringEndsWith
        // - StringContains
        // - EqualNullSafe
        Trivial(true)
    }
  }