Scala Column类代码示例

//设置package包名称以及导入依赖的类
package me.danielpes.spark.datetime

import org.apache.spark.sql.Column
import org.apache.spark.sql.types.{DataType, DateType, TimestampType}
import org.apache.spark.sql.functions.{col, udf}

class DateTimeColumn(val col: Column, dataType: DataType = TimestampType) {

  def +(p: Period): Column = dataType match {
    case _: DateType => udf((d: java.sql.Date) => new RichDate(d) + p).apply(col)
    case _: TimestampType => udf((ts: java.sql.Timestamp) => new RichDate(ts) + p).apply(col)
  }

  def -(p: Period): Column = this.+(-p)

  override def toString: String = s"{column: ${col.toString}, type: ${dataType.toString}}"
}

object DateTimeColumn {

  def apply(col: Column, dataType: DataType = TimestampType) = new DateTimeColumn(col, dataType)
  def apply(col: Column, typeString: String) = new DateTimeColumn(col, typeFromString(typeString))
  def apply(cName: String) = new DateTimeColumn(col(cName), TimestampType)
  def apply(cName: String, dataType: DataType) = new DateTimeColumn(col(cName), dataType)
  def apply(cName: String, typeString: String) = new DateTimeColumn(col(cName), typeFromString(typeString))

  private def typeFromString(s: String): DataType = s match {
    case "date" => DateType
    case "timestamp" => TimestampType
  }
} 

//设置package包名称以及导入依赖的类
package com.bloomberg.sparkflow.dc

import org.apache.spark.sql.{Column, Dataset, Row}


class DataFrameFunctions(self: DC[Row]) {

    def join(right: DC[Row]): DC[Row] = {
      val f = (left: Dataset[_], right: Dataset[_]) => {
        left.join(right)
      }
      val hashTarget = Seq("join")
      new MultiDatasetTransformDC(self, right, f, hashTarget)
    }

    def join(right: DC[Row], usingColumn: String): DC[Row] = {
      val f = (left: Dataset[_], right: Dataset[_]) => {
        left.join(right, usingColumn)
      }
      val hashTarget = Seq("join", usingColumn)
      new MultiDatasetTransformDC(self, right, f, hashTarget)
    }

    def join(right: DC[Row], joinExprs: Column): DC[Row] = join(right, joinExprs, "inner")

    def join(right: DC[Row], joinExprs: Column, joinType: String): DC[Row] = {
      val f = (left: Dataset[_], right: Dataset[_]) => {
        left.join(right, joinExprs)
      }
      val hashTarget = Seq("join", joinType, joinExprs.toString())
      new MultiDatasetTransformDC(self, right, f, hashTarget)
    }


} 

//设置package包名称以及导入依赖的类
package fr.ippon.spark.ml

import org.apache.spark.sql.types.DoubleType
import org.apache.spark.sql.{functions, Column, DataFrame, SQLContext}


object Titanic {

  // Fonction de récupération des données d'un fichier de Titanic dans un DataFrame
  def dataframeFromTitanicFile(sqlc: SQLContext, file: String): DataFrame = sqlc.read
    .format("com.databricks.spark.csv")
    .option("header", "true")
    .option("inferSchema", "true")
    .load(file)

  // Fonction de calcul de l'age moyen
  def calcMeanAge(df: DataFrame, inputCol: String): Double = df
    .agg(functions.avg(df(inputCol)))
    .head
    .getDouble(0)

  // Fonction nous donnant l'age ou la moyenne des ages
  def fillMissingAge(df: DataFrame, inputCol: String, outputCol: String, replacementValue: Double): DataFrame = {
    val ageValue: (Any) => Double = age => age match {
      case age: Double => age
      case _ => replacementValue
    }
    df.withColumn(outputCol, functions.callUDF(ageValue, DoubleType, df(inputCol)))
  }
} 

//设置package包名称以及导入依赖的类
package me.danielpes.spark.datetime

import org.apache.spark.sql.Column
import org.scalatest.FlatSpec

class ImplicitsSuite extends FlatSpec {

  "this" should "implicitly convert Ints, Longs and Dates" in {
    // Given
    val intVal: Int = 15
    val longVal: Long = 150L
    val dateVal: java.sql.Date = java.sql.Date.valueOf("2010-01-01")
    val columnVal: Column = new Column("a_column")

    // When
    import implicits._
    val richIntVal: RichInt = intVal
    val richLongVal: RichLong = longVal
    val richDateVal: RichDate[java.sql.Date] = dateVal
    val richColumnVal: RichColumn = columnVal

    // Then
    assert(richIntVal.value == intVal)
    assert(richLongVal.value == longVal)
    assert(richDateVal.datetime == dateVal)
    assert(richColumnVal.column == columnVal)
  }
} 

//设置package包名称以及导入依赖的类
package be.dataminded.wharlord.constraints

import org.apache.spark.sql.{Column, DataFrame}

import scala.util.Try

case class ColumnColumnConstraint(constraintColumn: Column) extends Constraint {

  val fun = (df: DataFrame) => {
    val maybeFailingRows = Try {
      val succeedingRows = df.filter(constraintColumn).count
      df.count - succeedingRows
    }
    ColumnColumnConstraintResult(
      constraint = this,
      data = maybeFailingRows.toOption.map(ColumnColumnConstraintResultData),
      status = tryToStatus[Long](maybeFailingRows, _ == 0)
    )
  }

}

case class ColumnColumnConstraintResult(constraint: ColumnColumnConstraint,
                                        data: Option[ColumnColumnConstraintResultData],
                                        status: ConstraintStatus)
    extends ConstraintResult[ColumnColumnConstraint] {

  val message: String = createColumnConstraintMessage(
    status = status,
    constraintResult = this,
    constraintString = constraint.constraintColumn.toString,
    maybeViolatingRows = data.map(_.failedRows)
  )

}

case class ColumnColumnConstraintResultData(failedRows: Long) 

//设置package包名称以及导入依赖的类
package be.dataminded.wharlord.constraints

import org.apache.spark.sql.{Column, DataFrame}

import scala.util.Try

case class AnyOfConstraint(columnName: String, allowedValues: Set[Any]) extends Constraint {

  val fun = (df: DataFrame) => {
    val maybeError = Try(df.select(new Column(columnName))) // check if column is not ambiguous
    val maybeColumnIndex = maybeError.map(_ => df.columns.indexOf(columnName))
    val maybeNotAllowedCount = maybeColumnIndex.map(columnIndex => df.rdd.filter(row => !row.isNullAt(columnIndex) &&
      !allowedValues.contains(row.get(columnIndex))).count)
    AnyOfConstraintResult(
      constraint = this,
      data = maybeNotAllowedCount.toOption.map(AnyOfConstraintResultData),
      status = tryToStatus[Long](maybeNotAllowedCount, _ == 0)
    )
  }

}

case class AnyOfConstraintResult(constraint: AnyOfConstraint,
                                 data: Option[AnyOfConstraintResultData],
                                 status: ConstraintStatus) extends ConstraintResult[AnyOfConstraint] {
  val message: String = {
    val allowed = constraint.allowedValues
    val columnName = constraint.columnName
    val maybeFailedRows = data.map(_.failedRows)
    val maybePluralSAndVerb = maybeFailedRows.map(failedRows => if (failedRows == 1) ("", "is") else ("s", "are"))
    (status, maybeFailedRows, maybePluralSAndVerb) match {
      case (ConstraintSuccess, Some(0), Some((pluralS, verb))) =>
        s"Column $columnName contains only values in $allowed."
      case (ConstraintFailure, Some(failedRows), Some((pluralS, verb))) =>
        s"Column $columnName contains $failedRows row$pluralS that $verb not in $allowed."
      case (ConstraintError(throwable), None, None) =>
        s"Checking whether column $columnName contains only values in $allowed failed: $throwable"
      case _ => throw IllegalConstraintResultException(this)
    }
  }
}

case class AnyOfConstraintResultData(failedRows: Long) 

//设置package包名称以及导入依赖的类
package be.dataminded.wharlord.constraints

import org.apache.spark.sql.{Column, DataFrame}

import scala.util.Try

case class UniqueKeyConstraint(columnNames: Seq[String]) extends Constraint {

  require(columnNames.nonEmpty)

  val fun = (df: DataFrame) => {
    val columns = columnNames.map(name => new Column(name))
    val maybeNonUniqueRows = Try(df.groupBy(columns: _*).count.filter(new Column("count") > 1).count)
    UniqueKeyConstraintResult(
      constraint = this,
      data = maybeNonUniqueRows.toOption.map(UniqueKeyConstraintResultData),
      status = tryToStatus[Long](maybeNonUniqueRows, _ == 0)
    )
  }

}

case class UniqueKeyConstraintResult(constraint: UniqueKeyConstraint,
                                     data: Option[UniqueKeyConstraintResultData],
                                     status: ConstraintStatus) extends ConstraintResult[UniqueKeyConstraint] {

  val message: String = {
    val columnNames = constraint.columnNames
    val columnsString = columnNames.mkString(", ")
    val isPlural = columnNames.length > 1
    val columnNoun = "Column" + (if (isPlural) "s" else "")
    val columnVerb = if (isPlural) "are" else "is"
    val maybeNumNonUniqueTuples = data.map(_.numNonUniqueTuples)
    val maybePluralS = maybeNumNonUniqueTuples.map(numNonUniqueTuples => if (numNonUniqueTuples != 1) "s" else "")
    (status, maybeNumNonUniqueTuples, maybePluralS) match {
      case (ConstraintSuccess, Some(0), _) =>
        s"$columnNoun $columnsString $columnVerb a key."
      case (ConstraintFailure, Some(numNonUniqueTuples), Some(pluralS)) =>
        s"$columnNoun $columnsString $columnVerb not a key ($numNonUniqueTuples non-unique tuple$pluralS)."
      case (ConstraintError(throwable), None, None) =>
        s"Checking whether ${columnNoun.toLowerCase()} $columnsString $columnVerb a key failed: $throwable"
      case default => throw IllegalConstraintResultException(this)
    }
  }

}

case class UniqueKeyConstraintResultData(numNonUniqueTuples: Long) 

//设置package包名称以及导入依赖的类
package be.dataminded.wharlord.constraints

import org.apache.spark.sql.{Column, DataFrame}

import scala.util.Try

case class FunctionalDependencyConstraint(determinantSet: Seq[String], dependentSet: Seq[String]) extends Constraint {

  require(determinantSet.nonEmpty, "determinantSet must not be empty")
  require(dependentSet.nonEmpty, "dependentSet must not be empty")

  val fun = (df: DataFrame) => {
    val determinantColumns = determinantSet.map(columnName => new Column(columnName))
    val dependentColumns = dependentSet.map(columnName     => new Column(columnName))
    val maybeRelevantSelection = Try(df.select(determinantColumns ++ dependentColumns: _*))

    val maybeDeterminantValueCounts = maybeRelevantSelection.map(_.distinct.groupBy(determinantColumns: _*).count)
    val maybeViolatingDeterminantValuesCount =
      maybeDeterminantValueCounts.map(_.filter(new Column("count") =!= 1).count)
    FunctionalDependencyConstraintResult(
      constraint = this,
      data = maybeViolatingDeterminantValuesCount.toOption.map(FunctionalDependencyConstraintResultData),
      status = tryToStatus[Long](maybeViolatingDeterminantValuesCount, _ == 0)
    )
  }

}

case class FunctionalDependencyConstraintResult(constraint: FunctionalDependencyConstraint,
                                                data: Option[FunctionalDependencyConstraintResultData],
                                                status: ConstraintStatus)
    extends ConstraintResult[FunctionalDependencyConstraint] {

  val message: String = {
    val maybeFailedRows = data.map(_.failedRows)
    val maybeRowPluralS = maybeFailedRows.map(failedRows => if (failedRows == 1) "" else "s")
    val dependentSet = constraint.dependentSet
    val determinantString = s"${constraint.determinantSet.mkString(", ")}"
    val dependentString = s"${dependentSet.mkString(", ")}"
    val (columnPluralS, columnVerb) = if (dependentSet.size == 1) ("", "is") else ("s", "are")
    (status, maybeFailedRows, maybeRowPluralS) match {
      case (ConstraintSuccess, Some(0), _) =>
        s"Column$columnPluralS $dependentString $columnVerb functionally dependent on $determinantString."
      case (ConstraintFailure, Some(failedRows), Some(rowPluralS)) =>
        s"Column$columnPluralS $dependentString $columnVerb not functionally dependent on " +
          s"$determinantString ($failedRows violating determinant value$rowPluralS)."
      case (ConstraintError(throwable), None, None) =>
        s"Checking whether column$columnPluralS $dependentString $columnVerb functionally " +
          s"dependent on $determinantString failed: $throwable"
      case default => throw IllegalConstraintResultException(this)
    }
  }
}

case class FunctionalDependencyConstraintResultData(failedRows: Long) 

//设置package包名称以及导入依赖的类
package be.dataminded.wharlord.constraints

import org.apache.spark.sql.functions.count
import org.apache.spark.sql.{Column, DataFrame}

case class NumberOfRowsConstraint(expected: Column) extends Constraint {

  val fun: (DataFrame) => NumberOfRowsConstraintResult = (df: DataFrame) => {
    val countDf = df.agg(count(new Column("*")).as(NumberOfRowsConstraint.countKey))
    val actual = countDf.collect().map(_.getLong(0)).apply(0)
    val satisfied = countDf.select(expected).collect().map(_.getBoolean(0)).apply(0)
    NumberOfRowsConstraintResult(
      constraint = this,
      actual = actual,
      status = if (satisfied) ConstraintSuccess else ConstraintFailure
    )
  }

}

object NumberOfRowsConstraint {

  private[constraints] val countKey: String = "count"

  def apply(expected: Column => Column): NumberOfRowsConstraint = {
    new NumberOfRowsConstraint(expected(new Column(countKey)))
  }

}

case class NumberOfRowsConstraintResult(constraint: NumberOfRowsConstraint,
                                        actual: Long,
                                        status: ConstraintStatus) extends ConstraintResult[NumberOfRowsConstraint] {

  val message: String = {
    val expected = constraint.expected
    status match {
      case ConstraintSuccess => s"The number of rows satisfies $expected."
      case ConstraintFailure => s"The actual number of rows $actual does not satisfy $expected."
      case _ => throw IllegalConstraintResultException(this)
    }
  }

} 

//设置package包名称以及导入依赖的类
package be.dataminded.wharlord.constraints

import java.util.regex.Pattern

import org.apache.spark.sql.functions._
import org.apache.spark.sql.{Column, DataFrame}

import scala.util.Try

case class RegexConstraint(columnName: String, regex: String) extends Constraint {

  val fun = (df: DataFrame) => {
    val pattern = Pattern.compile(regex)
    val doesNotMatch = udf((column: String) => column != null && !pattern.matcher(column).find())
    val maybeDoesNotMatchCount = Try(df.filter(doesNotMatch(new Column(columnName))).count)
    RegexConstraintResult(
      constraint = this,
      data = maybeDoesNotMatchCount.toOption.map(RegexConstraintResultData),
      status = tryToStatus[Long](maybeDoesNotMatchCount, _ == 0)
    )
  }

}

case class RegexConstraintResult(constraint: RegexConstraint,
                                 data: Option[RegexConstraintResultData],
                                 status: ConstraintStatus) extends ConstraintResult[RegexConstraint] {

  val message: String = {
    val columnName = constraint.columnName
    val regex = constraint.regex
    val maybeFailedRows = data.map(_.failedRows)
    val maybePluralSAndVerb = maybeFailedRows.map(failedRows => if (failedRows == 1) ("", "does") else ("s", "do"))
    (status, maybeFailedRows, maybePluralSAndVerb) match {
      case (ConstraintSuccess, Some(0), _) =>
        s"Column $columnName matches $regex"
      case (ConstraintFailure, Some(failedRows), Some((pluralS, verb))) =>
        s"Column $columnName contains $failedRows row$pluralS that $verb not match $regex"
      case (ConstraintError(throwable), None, None) =>
        s"Checking whether column $columnName matches $regex failed: $throwable"
      case default => throw IllegalConstraintResultException(this)
    }
  }

}

case class RegexConstraintResultData(failedRows: Long) 

//设置package包名称以及导入依赖的类
package be.dataminded.wharlord.constraints

import org.apache.spark.sql.{Column, DataFrame}

import scala.util.Try

case class AlwaysNullConstraint(columnName: String) extends Constraint {

  override val fun: (DataFrame) => AlwaysNullConstraintResult = (df: DataFrame) => {
    val tryNotNullCount = Try(df.filter(new Column(columnName).isNotNull).count)
    AlwaysNullConstraintResult(
      constraint = this,
      status = tryToStatus[Long](tryNotNullCount, _ == 0),
      data = tryNotNullCount.toOption.map(AlwaysNullConstraintResultData)
    )
  }

}

case class AlwaysNullConstraintResult(constraint: AlwaysNullConstraint,
                                      status: ConstraintStatus,
                                      data: Option[AlwaysNullConstraintResultData])
    extends ConstraintResult[AlwaysNullConstraint] {

  val message: String = {
    val columnName = constraint.columnName
    val maybeNonNullRows = data.map(_.nonNullRows)
    val maybePluralS = maybeNonNullRows.map(n => if (n == 1) "" else "s")
    (status, maybeNonNullRows, maybePluralS) match {
      case (ConstraintError(throwable), None, None) =>
        s"Checking column $columnName for being always null failed: $throwable"
      case (ConstraintSuccess, Some(0), Some(_)) =>
        s"Column $columnName is always null."
      case (ConstraintFailure, Some(nonNullRows), Some(pluralS)) =>
        s"Column $columnName contains $nonNullRows non-null row$pluralS (should always be null)."
      case _ => throw IllegalConstraintResultException(this)
    }
  }

}

case class AlwaysNullConstraintResultData(nonNullRows: Long) 

//设置package包名称以及导入依赖的类
package be.dataminded.wharlord.constraints

import org.apache.spark.sql.{Column, DataFrame}

import scala.util.Try

case class NeverNullConstraint(columnName: String) extends Constraint {

  val fun: (DataFrame) => NeverNullConstraintResult = (df: DataFrame) => {
    val tryNullCount = Try(df.filter(new Column(columnName).isNull).count)
    NeverNullConstraintResult(
      constraint = this,
      data = tryNullCount.toOption.map(NeverNullConstraintResultData),
      status = tryToStatus[Long](tryNullCount, _ == 0)
    )
  }
}

case class NeverNullConstraintResult(constraint: NeverNullConstraint,
                                     data: Option[NeverNullConstraintResultData],
                                     status: ConstraintStatus)
    extends ConstraintResult[NeverNullConstraint] {
  val message: String = {
    val columnName = constraint.columnName
    val maybeNullRows = data.map(_.nullRows)
    val maybePluralS = maybeNullRows.map(nullRows => if (nullRows == 1) "" else "s")
    val maybeVerb = maybeNullRows.map(nullRows    => if (nullRows == 1) "is" else "are")
    (status, maybeNullRows, maybePluralS, maybeVerb) match {
      case (ConstraintSuccess, Some(0), Some(pluralS), Some(verb)) =>
        s"Column $columnName is never null."
      case (ConstraintFailure, Some(nullRows), Some(pluralS), Some(verb)) =>
        s"Column $columnName contains $nullRows row$pluralS that $verb null (should never be null)."
      case (ConstraintError(throwable), None, None, None) =>
        s"Checking column $columnName for being never null failed: $throwable"
      case _ => throw IllegalConstraintResultException(this)
    }
  }
}

case class NeverNullConstraintResultData(nullRows: Long) 

//设置package包名称以及导入依赖的类
package be.dataminded.wharlord.constraints

import org.apache.spark.sql.{Column, DataFrame}

import scala.util.Try

case class ConditionalColumnConstraint(statement: Column, implication: Column) extends Constraint {

  val fun = (df: DataFrame) => {
    val maybeFailingRows = Try {
      val succeedingRows = df.filter(!statement || implication).count
      df.count - succeedingRows
    }
    ConditionalColumnConstraintResult(
      constraint = this,
      data = maybeFailingRows.toOption.map(ConditionalColumnConstraintResultData),
      status = tryToStatus[Long](maybeFailingRows, _ == 0)
    )
  }

}

case class ConditionalColumnConstraintResult(constraint: ConditionalColumnConstraint,
                                             data: Option[ConditionalColumnConstraintResultData],
                                             status: ConstraintStatus) extends ConstraintResult[ConditionalColumnConstraint] {

  val message: String = createColumnConstraintMessage(
    status = status,
    constraintResult = this,
    constraintString = s"${constraint.statement} -> ${constraint.implication}",
    maybeViolatingRows = data.map(_.failedRows)
  )

}

case class ConditionalColumnConstraintResultData(failedRows: Long) 

//设置package包名称以及导入依赖的类
package be.dataminded.wharlord.constraints

import java.text.SimpleDateFormat

import org.apache.spark.sql.functions._
import org.apache.spark.sql.{Column, DataFrame}

import scala.util.Try

case class DateFormatConstraint(columnName: String,
                                format: SimpleDateFormat) extends Constraint {

  val fun = (df: DataFrame) => {
    val cannotBeDate = udf((column: String) => column != null && Try(format.parse(column)).isFailure)
    val maybeCannotBeDateCount = Try(df.filter(cannotBeDate(new Column(columnName))).count)
    DateFormatConstraintResult(
      this,
      data = maybeCannotBeDateCount.toOption.map(DateFormatConstraintResultData),
      status = tryToStatus[Long](maybeCannotBeDateCount, _ == 0)
    )
  }

}

case class DateFormatConstraintResult(constraint: DateFormatConstraint,
                                      data: Option[DateFormatConstraintResultData],
                                      status: ConstraintStatus) extends ConstraintResult[DateFormatConstraint] {

  val message: String = {
    val format = constraint.format.toPattern
    val columnName = constraint.columnName
    val maybeFailedRows = data.map(_.failedRows)
    val maybePluralS = maybeFailedRows.map(failedRows => if (failedRows == 1) "" else "s")
    val maybeVerb = maybeFailedRows.map(failedRows => if (failedRows == 1) "is" else "are")
    (status, maybeFailedRows, maybePluralS, maybeVerb) match {
      case (ConstraintSuccess, Some(0), _, _) =>
        s"Column $columnName is formatted by $format."
      case (ConstraintFailure, Some(failedRows), Some(pluralS), Some(verb)) =>
        s"Column $columnName contains $failedRows row$pluralS that $verb not formatted by $format."
      case (ConstraintError(throwable), None, None, None) =>
        s"Checking whether column $columnName is formatted by $format failed: $throwable"
      case default => throw IllegalConstraintResultException(this)
    }

  }

}

case class DateFormatConstraintResultData(failedRows: Long) 

//设置package包名称以及导入依赖的类
package be.dataminded.wharlord.constraints

import org.apache.spark.sql.types.DataType
import org.apache.spark.sql.{Column, DataFrame}

import scala.util.Try

case class TypeConversionConstraint(columnName: String,
                                    convertedType: DataType) extends Constraint {

  val fun = (df: DataFrame) => {
    val originalColumn = new Column(columnName)
    val castedColumnName = columnName + "_casted"
    val maybeCasted = Try(df.select(originalColumn, originalColumn.cast(convertedType).as(castedColumnName)))
    val maybeFailedCastsAndOriginalType = maybeCasted.map(casted => {
      val failedCastsCount = casted.filter(new Column(castedColumnName).isNull && originalColumn.isNotNull).count
      val originalType = df.schema.find(_.name == columnName).get.dataType
      (failedCastsCount, originalType)
    })
    TypeConversionConstraintResult(
      constraint = this,
      data = maybeFailedCastsAndOriginalType.toOption.map{ case (failedCastsCount, originalType) =>
        TypeConversionConstraintResultData(
          originalType = originalType,
          failedRows = failedCastsCount
        )
      },
      status = tryToStatus[Long](maybeFailedCastsAndOriginalType.map{
        case (failedCastsCount, originalType) => failedCastsCount
      }, _ == 0)
    )
  }

}

case class TypeConversionConstraintResult(constraint: TypeConversionConstraint,
                                          data: Option[TypeConversionConstraintResultData],
                                          status: ConstraintStatus) extends ConstraintResult[TypeConversionConstraint] {

  val message: String = {
    val convertedType = constraint.convertedType
    val columnName = constraint.columnName
    val maybePluralSVerb = data.map(data => if (data.failedRows == 1) ("", "is") else ("s", "are"))
    (status, data, maybePluralSVerb) match {
      case (ConstraintSuccess, Some(TypeConversionConstraintResultData(originalType, 0)), _) =>
        s"Column $columnName can be converted from $originalType to $convertedType."
      case (ConstraintFailure, Some(TypeConversionConstraintResultData(originalType, failedRows)), Some((pluralS, verb))) =>
        s"Column $columnName cannot be converted from $originalType to $convertedType. " +
        s"$failedRows row$pluralS could not be converted."
      case (ConstraintError(throwable), None, None) =>
        s"Checking whether column $columnName can be converted to $convertedType failed: $throwable"
      case default => throw IllegalConstraintResultException(this)
    }
  }

}

case class TypeConversionConstraintResultData(originalType: DataType, failedRows: Long)