/
Cast.scala
1906 lines (1755 loc) · 73.1 KB
/
Cast.scala
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.spark.sql.catalyst.expressions
import java.math.{BigDecimal => JavaBigDecimal}
import java.time.ZoneId
import java.util.Locale
import java.util.concurrent.TimeUnit._
import org.apache.spark.SparkException
import org.apache.spark.sql.catalyst.InternalRow
import org.apache.spark.sql.catalyst.analysis.{TypeCheckResult, TypeCoercion}
import org.apache.spark.sql.catalyst.expressions.Cast.{canCast, forceNullable, resolvableNullability}
import org.apache.spark.sql.catalyst.expressions.codegen._
import org.apache.spark.sql.catalyst.expressions.codegen.Block._
import org.apache.spark.sql.catalyst.util._
import org.apache.spark.sql.catalyst.util.DateTimeConstants._
import org.apache.spark.sql.catalyst.util.DateTimeUtils._
import org.apache.spark.sql.internal.SQLConf
import org.apache.spark.sql.types._
import org.apache.spark.unsafe.UTF8StringBuilder
import org.apache.spark.unsafe.types.{CalendarInterval, UTF8String}
import org.apache.spark.unsafe.types.UTF8String.{IntWrapper, LongWrapper}
object Cast {
/**
* Returns true iff we can cast `from` type to `to` type.
*/
def canCast(from: DataType, to: DataType): Boolean = (from, to) match {
case (fromType, toType) if fromType == toType => true
case (NullType, _) => true
case (_, StringType) => true
case (StringType, BinaryType) => true
case (_: IntegralType, BinaryType) => true
case (StringType, BooleanType) => true
case (DateType, BooleanType) => true
case (TimestampType, BooleanType) => true
case (_: NumericType, BooleanType) => true
case (StringType, TimestampType) => true
case (BooleanType, TimestampType) => true
case (DateType, TimestampType) => true
case (_: NumericType, TimestampType) =>
SQLConf.get.getConf(SQLConf.LEGACY_ALLOW_CAST_NUMERIC_TO_TIMESTAMP)
case (StringType, DateType) => true
case (TimestampType, DateType) => true
case (StringType, CalendarIntervalType) => true
case (StringType, _: NumericType) => true
case (BooleanType, _: NumericType) => true
case (DateType, _: NumericType) => true
case (TimestampType, _: NumericType) => true
case (_: NumericType, _: NumericType) => true
case (ArrayType(fromType, fn), ArrayType(toType, tn)) =>
canCast(fromType, toType) &&
resolvableNullability(fn || forceNullable(fromType, toType), tn)
case (MapType(fromKey, fromValue, fn), MapType(toKey, toValue, tn)) =>
canCast(fromKey, toKey) &&
(!forceNullable(fromKey, toKey)) &&
canCast(fromValue, toValue) &&
resolvableNullability(fn || forceNullable(fromValue, toValue), tn)
case (StructType(fromFields), StructType(toFields)) =>
fromFields.length == toFields.length &&
fromFields.zip(toFields).forall {
case (fromField, toField) =>
canCast(fromField.dataType, toField.dataType) &&
resolvableNullability(
fromField.nullable || forceNullable(fromField.dataType, toField.dataType),
toField.nullable)
}
case (udt1: UserDefinedType[_], udt2: UserDefinedType[_]) if udt2.acceptsType(udt1) => true
case _ => false
}
/**
* Return true if we need to use the `timeZone` information casting `from` type to `to` type.
* The patterns matched reflect the current implementation in the Cast node.
* c.f. usage of `timeZone` in:
* * Cast.castToString
* * Cast.castToDate
* * Cast.castToTimestamp
*/
def needsTimeZone(from: DataType, to: DataType): Boolean = (from, to) match {
case (StringType, TimestampType | DateType) => true
case (TimestampType | DateType, StringType) => true
case (DateType, TimestampType) => true
case (TimestampType, DateType) => true
case (ArrayType(fromType, _), ArrayType(toType, _)) => needsTimeZone(fromType, toType)
case (MapType(fromKey, fromValue, _), MapType(toKey, toValue, _)) =>
needsTimeZone(fromKey, toKey) || needsTimeZone(fromValue, toValue)
case (StructType(fromFields), StructType(toFields)) =>
fromFields.length == toFields.length &&
fromFields.zip(toFields).exists {
case (fromField, toField) =>
needsTimeZone(fromField.dataType, toField.dataType)
}
case _ => false
}
/**
* Returns true iff we can safely up-cast the `from` type to `to` type without any truncating or
* precision lose or possible runtime failures. For example, long -> int, string -> int are not
* up-cast.
*/
def canUpCast(from: DataType, to: DataType): Boolean = (from, to) match {
case _ if from == to => true
case (from: NumericType, to: DecimalType) if to.isWiderThan(from) => true
case (from: DecimalType, to: NumericType) if from.isTighterThan(to) => true
case (f, t) if legalNumericPrecedence(f, t) => true
case (DateType, TimestampType) => true
case (_: AtomicType, StringType) => true
case (_: CalendarIntervalType, StringType) => true
case (NullType, _) => true
// Spark supports casting between long and timestamp, please see `longToTimestamp` and
// `timestampToLong` for details.
case (TimestampType, LongType) => true
case (LongType, TimestampType) => true
case (ArrayType(fromType, fn), ArrayType(toType, tn)) =>
resolvableNullability(fn, tn) && canUpCast(fromType, toType)
case (MapType(fromKey, fromValue, fn), MapType(toKey, toValue, tn)) =>
resolvableNullability(fn, tn) && canUpCast(fromKey, toKey) && canUpCast(fromValue, toValue)
case (StructType(fromFields), StructType(toFields)) =>
fromFields.length == toFields.length &&
fromFields.zip(toFields).forall {
case (f1, f2) =>
resolvableNullability(f1.nullable, f2.nullable) && canUpCast(f1.dataType, f2.dataType)
}
case (from: UserDefinedType[_], to: UserDefinedType[_]) if to.acceptsType(from) => true
case _ => false
}
/**
* Returns true iff we can cast the `from` type to `to` type as per the ANSI SQL.
* In practice, the behavior is mostly the same as PostgreSQL. It disallows certain unreasonable
* type conversions such as converting `string` to `int` or `double` to `boolean`.
*/
def canANSIStoreAssign(from: DataType, to: DataType): Boolean = (from, to) match {
case _ if from == to => true
case (NullType, _) => true
case (_: NumericType, _: NumericType) => true
case (_: AtomicType, StringType) => true
case (_: CalendarIntervalType, StringType) => true
case (DateType, TimestampType) => true
case (TimestampType, DateType) => true
case (ArrayType(fromType, fn), ArrayType(toType, tn)) =>
resolvableNullability(fn, tn) && canANSIStoreAssign(fromType, toType)
case (MapType(fromKey, fromValue, fn), MapType(toKey, toValue, tn)) =>
resolvableNullability(fn, tn) && canANSIStoreAssign(fromKey, toKey) &&
canANSIStoreAssign(fromValue, toValue)
case (StructType(fromFields), StructType(toFields)) =>
fromFields.length == toFields.length &&
fromFields.zip(toFields).forall {
case (f1, f2) =>
resolvableNullability(f1.nullable, f2.nullable) &&
canANSIStoreAssign(f1.dataType, f2.dataType)
}
case _ => false
}
private def legalNumericPrecedence(from: DataType, to: DataType): Boolean = {
val fromPrecedence = TypeCoercion.numericPrecedence.indexOf(from)
val toPrecedence = TypeCoercion.numericPrecedence.indexOf(to)
fromPrecedence >= 0 && fromPrecedence < toPrecedence
}
def canNullSafeCastToDecimal(from: DataType, to: DecimalType): Boolean = from match {
case from: BooleanType if to.isWiderThan(DecimalType.BooleanDecimal) => true
case from: NumericType if to.isWiderThan(from) => true
case from: DecimalType =>
// truncating or precision lose
(to.precision - to.scale) > (from.precision - from.scale)
case _ => false // overflow
}
/**
* Returns `true` if casting non-nullable values from `from` type to `to` type
* may return null. Note that the caller side should take care of input nullability
* first and only call this method if the input is not nullable.
*/
def forceNullable(from: DataType, to: DataType): Boolean = (from, to) match {
case (NullType, _) => false // empty array or map case
case (_, _) if from == to => false
case (StringType, BinaryType) => false
case (StringType, _) => true
case (_, StringType) => false
case (FloatType | DoubleType, TimestampType) => true
case (TimestampType, DateType) => false
case (_, DateType) => true
case (DateType, TimestampType) => false
case (DateType, _) => true
case (_, CalendarIntervalType) => true
case (_, to: DecimalType) if !canNullSafeCastToDecimal(from, to) => true
case (_: FractionalType, _: IntegralType) => true // NaN, infinity
case _ => false
}
def resolvableNullability(from: Boolean, to: Boolean): Boolean = !from || to
/**
* We process literals such as 'Infinity', 'Inf', '-Infinity' and 'NaN' etc in case
* insensitive manner to be compatible with other database systems such as PostgreSQL and DB2.
*/
def processFloatingPointSpecialLiterals(v: String, isFloat: Boolean): Any = {
v.trim.toLowerCase(Locale.ROOT) match {
case "inf" | "+inf" | "infinity" | "+infinity" =>
if (isFloat) Float.PositiveInfinity else Double.PositiveInfinity
case "-inf" | "-infinity" =>
if (isFloat) Float.NegativeInfinity else Double.NegativeInfinity
case "nan" =>
if (isFloat) Float.NaN else Double.NaN
case _ => null
}
}
}
abstract class CastBase extends UnaryExpression with TimeZoneAwareExpression with NullIntolerant {
def child: Expression
def dataType: DataType
/**
* Returns true iff we can cast `from` type to `to` type.
*/
def canCast(from: DataType, to: DataType): Boolean
override def toString: String = {
val ansi = if (ansiEnabled) "ansi_" else ""
s"${ansi}cast($child as ${dataType.simpleString})"
}
override def checkInputDataTypes(): TypeCheckResult = {
if (canCast(child.dataType, dataType)) {
TypeCheckResult.TypeCheckSuccess
} else {
TypeCheckResult.TypeCheckFailure(
if (child.dataType.isInstanceOf[NumericType] && dataType.isInstanceOf[TimestampType]) {
s"cannot cast ${child.dataType.catalogString} to ${dataType.catalogString}," +
"you can enable the casting by setting " +
s"${SQLConf.LEGACY_ALLOW_CAST_NUMERIC_TO_TIMESTAMP.key} to true," +
"but we strongly recommend using function " +
"TIMESTAMP_SECONDS/TIMESTAMP_MILLIS/TIMESTAMP_MICROS instead."
} else {
s"cannot cast ${child.dataType.catalogString} to ${dataType.catalogString}"
})
}
}
override def nullable: Boolean = child.nullable || Cast.forceNullable(child.dataType, dataType)
protected def ansiEnabled: Boolean
// When this cast involves TimeZone, it's only resolved if the timeZoneId is set;
// Otherwise behave like Expression.resolved.
override lazy val resolved: Boolean =
childrenResolved && checkInputDataTypes().isSuccess && (!needsTimeZone || timeZoneId.isDefined)
def needsTimeZone: Boolean = Cast.needsTimeZone(child.dataType, dataType)
// [[func]] assumes the input is no longer null because eval already does the null check.
@inline private[this] def buildCast[T](a: Any, func: T => Any): Any = func(a.asInstanceOf[T])
private lazy val dateFormatter = DateFormatter(zoneId)
private lazy val timestampFormatter = TimestampFormatter.getFractionFormatter(zoneId)
private val legacyCastToStr = SQLConf.get.getConf(SQLConf.LEGACY_COMPLEX_TYPES_TO_STRING)
// The brackets that are used in casting structs and maps to strings
private val (leftBracket, rightBracket) = if (legacyCastToStr) ("[", "]") else ("{", "}")
// UDFToString
private[this] def castToString(from: DataType): Any => Any = from match {
case CalendarIntervalType =>
buildCast[CalendarInterval](_, i => UTF8String.fromString(i.toString))
case BinaryType => buildCast[Array[Byte]](_, UTF8String.fromBytes)
case DateType => buildCast[Int](_, d => UTF8String.fromString(dateFormatter.format(d)))
case TimestampType => buildCast[Long](_,
t => UTF8String.fromString(timestampFormatter.format(t)))
case ArrayType(et, _) =>
buildCast[ArrayData](_, array => {
val builder = new UTF8StringBuilder
builder.append("[")
if (array.numElements > 0) {
val toUTF8String = castToString(et)
if (array.isNullAt(0)) {
if (!legacyCastToStr) builder.append("null")
} else {
builder.append(toUTF8String(array.get(0, et)).asInstanceOf[UTF8String])
}
var i = 1
while (i < array.numElements) {
builder.append(",")
if (array.isNullAt(i)) {
if (!legacyCastToStr) builder.append(" null")
} else {
builder.append(" ")
builder.append(toUTF8String(array.get(i, et)).asInstanceOf[UTF8String])
}
i += 1
}
}
builder.append("]")
builder.build()
})
case MapType(kt, vt, _) =>
buildCast[MapData](_, map => {
val builder = new UTF8StringBuilder
builder.append(leftBracket)
if (map.numElements > 0) {
val keyArray = map.keyArray()
val valueArray = map.valueArray()
val keyToUTF8String = castToString(kt)
val valueToUTF8String = castToString(vt)
builder.append(keyToUTF8String(keyArray.get(0, kt)).asInstanceOf[UTF8String])
builder.append(" ->")
if (valueArray.isNullAt(0)) {
if (!legacyCastToStr) builder.append(" null")
} else {
builder.append(" ")
builder.append(valueToUTF8String(valueArray.get(0, vt)).asInstanceOf[UTF8String])
}
var i = 1
while (i < map.numElements) {
builder.append(", ")
builder.append(keyToUTF8String(keyArray.get(i, kt)).asInstanceOf[UTF8String])
builder.append(" ->")
if (valueArray.isNullAt(i)) {
if (!legacyCastToStr) builder.append(" null")
} else {
builder.append(" ")
builder.append(valueToUTF8String(valueArray.get(i, vt))
.asInstanceOf[UTF8String])
}
i += 1
}
}
builder.append(rightBracket)
builder.build()
})
case StructType(fields) =>
buildCast[InternalRow](_, row => {
val builder = new UTF8StringBuilder
builder.append(leftBracket)
if (row.numFields > 0) {
val st = fields.map(_.dataType)
val toUTF8StringFuncs = st.map(castToString)
if (row.isNullAt(0)) {
if (!legacyCastToStr) builder.append("null")
} else {
builder.append(toUTF8StringFuncs(0)(row.get(0, st(0))).asInstanceOf[UTF8String])
}
var i = 1
while (i < row.numFields) {
builder.append(",")
if (row.isNullAt(i)) {
if (!legacyCastToStr) builder.append(" null")
} else {
builder.append(" ")
builder.append(toUTF8StringFuncs(i)(row.get(i, st(i))).asInstanceOf[UTF8String])
}
i += 1
}
}
builder.append(rightBracket)
builder.build()
})
case pudt: PythonUserDefinedType => castToString(pudt.sqlType)
case udt: UserDefinedType[_] =>
buildCast[Any](_, o => UTF8String.fromString(udt.deserialize(o).toString))
case _ => buildCast[Any](_, o => UTF8String.fromString(o.toString))
}
// BinaryConverter
private[this] def castToBinary(from: DataType): Any => Any = from match {
case StringType => buildCast[UTF8String](_, _.getBytes)
case ByteType => buildCast[Byte](_, NumberConverter.toBinary)
case ShortType => buildCast[Short](_, NumberConverter.toBinary)
case IntegerType => buildCast[Int](_, NumberConverter.toBinary)
case LongType => buildCast[Long](_, NumberConverter.toBinary)
}
// UDFToBoolean
private[this] def castToBoolean(from: DataType): Any => Any = from match {
case StringType =>
buildCast[UTF8String](_, s => {
if (StringUtils.isTrueString(s)) {
true
} else if (StringUtils.isFalseString(s)) {
false
} else {
null
}
})
case TimestampType =>
buildCast[Long](_, t => t != 0)
case DateType =>
// Hive would return null when cast from date to boolean
buildCast[Int](_, d => null)
case LongType =>
buildCast[Long](_, _ != 0)
case IntegerType =>
buildCast[Int](_, _ != 0)
case ShortType =>
buildCast[Short](_, _ != 0)
case ByteType =>
buildCast[Byte](_, _ != 0)
case DecimalType() =>
buildCast[Decimal](_, !_.isZero)
case DoubleType =>
buildCast[Double](_, _ != 0)
case FloatType =>
buildCast[Float](_, _ != 0)
}
// TimestampConverter
private[this] def castToTimestamp(from: DataType): Any => Any = from match {
case StringType =>
buildCast[UTF8String](_, utfs => DateTimeUtils.stringToTimestamp(utfs, zoneId).orNull)
case BooleanType =>
buildCast[Boolean](_, b => if (b) 1L else 0)
case LongType =>
buildCast[Long](_, l => longToTimestamp(l))
case IntegerType =>
buildCast[Int](_, i => longToTimestamp(i.toLong))
case ShortType =>
buildCast[Short](_, s => longToTimestamp(s.toLong))
case ByteType =>
buildCast[Byte](_, b => longToTimestamp(b.toLong))
case DateType =>
buildCast[Int](_, d => daysToMicros(d, zoneId))
// TimestampWritable.decimalToTimestamp
case DecimalType() =>
buildCast[Decimal](_, d => decimalToTimestamp(d))
// TimestampWritable.doubleToTimestamp
case DoubleType =>
buildCast[Double](_, d => doubleToTimestamp(d))
// TimestampWritable.floatToTimestamp
case FloatType =>
buildCast[Float](_, f => doubleToTimestamp(f.toDouble))
}
private[this] def decimalToTimestamp(d: Decimal): Long = {
(d.toBigDecimal * MICROS_PER_SECOND).longValue
}
private[this] def doubleToTimestamp(d: Double): Any = {
if (d.isNaN || d.isInfinite) null else (d * MICROS_PER_SECOND).toLong
}
// converting seconds to us
private[this] def longToTimestamp(t: Long): Long = SECONDS.toMicros(t)
// converting us to seconds
private[this] def timestampToLong(ts: Long): Long = {
Math.floorDiv(ts, MICROS_PER_SECOND)
}
// converting us to seconds in double
private[this] def timestampToDouble(ts: Long): Double = {
ts / MICROS_PER_SECOND.toDouble
}
// DateConverter
private[this] def castToDate(from: DataType): Any => Any = from match {
case StringType =>
buildCast[UTF8String](_, s => DateTimeUtils.stringToDate(s, zoneId).orNull)
case TimestampType =>
// throw valid precision more than seconds, according to Hive.
// Timestamp.nanos is in 0 to 999,999,999, no more than a second.
buildCast[Long](_, t => microsToDays(t, zoneId))
}
// IntervalConverter
private[this] def castToInterval(from: DataType): Any => Any = from match {
case StringType =>
buildCast[UTF8String](_, s => IntervalUtils.safeStringToInterval(s))
}
// LongConverter
private[this] def castToLong(from: DataType): Any => Any = from match {
case StringType if ansiEnabled =>
buildCast[UTF8String](_, _.toLongExact())
case StringType =>
val result = new LongWrapper()
buildCast[UTF8String](_, s => if (s.toLong(result)) result.value else null)
case BooleanType =>
buildCast[Boolean](_, b => if (b) 1L else 0L)
case DateType =>
buildCast[Int](_, d => null)
case TimestampType =>
buildCast[Long](_, t => timestampToLong(t))
case x: NumericType if ansiEnabled =>
b => x.exactNumeric.asInstanceOf[Numeric[Any]].toLong(b)
case x: NumericType =>
b => x.numeric.asInstanceOf[Numeric[Any]].toLong(b)
}
// IntConverter
private[this] def castToInt(from: DataType): Any => Any = from match {
case StringType if ansiEnabled =>
buildCast[UTF8String](_, _.toIntExact())
case StringType =>
val result = new IntWrapper()
buildCast[UTF8String](_, s => if (s.toInt(result)) result.value else null)
case BooleanType =>
buildCast[Boolean](_, b => if (b) 1 else 0)
case DateType =>
buildCast[Int](_, d => null)
case TimestampType if ansiEnabled =>
buildCast[Long](_, t => {
val longValue = timestampToLong(t)
if (longValue == longValue.toInt) {
longValue.toInt
} else {
throw new ArithmeticException(s"Casting $t to int causes overflow")
}
})
case TimestampType =>
buildCast[Long](_, t => timestampToLong(t).toInt)
case x: NumericType if ansiEnabled =>
b => x.exactNumeric.asInstanceOf[Numeric[Any]].toInt(b)
case x: NumericType =>
b => x.numeric.asInstanceOf[Numeric[Any]].toInt(b)
}
// ShortConverter
private[this] def castToShort(from: DataType): Any => Any = from match {
case StringType if ansiEnabled =>
buildCast[UTF8String](_, _.toShortExact())
case StringType =>
val result = new IntWrapper()
buildCast[UTF8String](_, s => if (s.toShort(result)) {
result.value.toShort
} else {
null
})
case BooleanType =>
buildCast[Boolean](_, b => if (b) 1.toShort else 0.toShort)
case DateType =>
buildCast[Int](_, d => null)
case TimestampType if ansiEnabled =>
buildCast[Long](_, t => {
val longValue = timestampToLong(t)
if (longValue == longValue.toShort) {
longValue.toShort
} else {
throw new ArithmeticException(s"Casting $t to short causes overflow")
}
})
case TimestampType =>
buildCast[Long](_, t => timestampToLong(t).toShort)
case x: NumericType if ansiEnabled =>
b =>
val intValue = try {
x.exactNumeric.asInstanceOf[Numeric[Any]].toInt(b)
} catch {
case _: ArithmeticException =>
throw new ArithmeticException(s"Casting $b to short causes overflow")
}
if (intValue == intValue.toShort) {
intValue.toShort
} else {
throw new ArithmeticException(s"Casting $b to short causes overflow")
}
case x: NumericType =>
b => x.numeric.asInstanceOf[Numeric[Any]].toInt(b).toShort
}
// ByteConverter
private[this] def castToByte(from: DataType): Any => Any = from match {
case StringType if ansiEnabled =>
buildCast[UTF8String](_, _.toByteExact())
case StringType =>
val result = new IntWrapper()
buildCast[UTF8String](_, s => if (s.toByte(result)) {
result.value.toByte
} else {
null
})
case BooleanType =>
buildCast[Boolean](_, b => if (b) 1.toByte else 0.toByte)
case DateType =>
buildCast[Int](_, d => null)
case TimestampType if ansiEnabled =>
buildCast[Long](_, t => {
val longValue = timestampToLong(t)
if (longValue == longValue.toByte) {
longValue.toByte
} else {
throw new ArithmeticException(s"Casting $t to byte causes overflow")
}
})
case TimestampType =>
buildCast[Long](_, t => timestampToLong(t).toByte)
case x: NumericType if ansiEnabled =>
b =>
val intValue = try {
x.exactNumeric.asInstanceOf[Numeric[Any]].toInt(b)
} catch {
case _: ArithmeticException =>
throw new ArithmeticException(s"Casting $b to byte causes overflow")
}
if (intValue == intValue.toByte) {
intValue.toByte
} else {
throw new ArithmeticException(s"Casting $b to byte causes overflow")
}
case x: NumericType =>
b => x.numeric.asInstanceOf[Numeric[Any]].toInt(b).toByte
}
/**
* Change the precision / scale in a given decimal to those set in `decimalType` (if any),
* modifying `value` in-place and returning it if successful. If an overflow occurs, it
* either returns null or throws an exception according to the value set for
* `spark.sql.ansi.enabled`.
*
* NOTE: this modifies `value` in-place, so don't call it on external data.
*/
private[this] def changePrecision(value: Decimal, decimalType: DecimalType): Decimal = {
if (value.changePrecision(decimalType.precision, decimalType.scale)) {
value
} else {
if (!ansiEnabled) {
null
} else {
throw new ArithmeticException(s"${value.toDebugString} cannot be represented as " +
s"Decimal(${decimalType.precision}, ${decimalType.scale}).")
}
}
}
/**
* Create new `Decimal` with precision and scale given in `decimalType` (if any).
* If overflow occurs, if `spark.sql.ansi.enabled` is false, null is returned;
* otherwise, an `ArithmeticException` is thrown.
*/
private[this] def toPrecision(value: Decimal, decimalType: DecimalType): Decimal =
value.toPrecision(
decimalType.precision, decimalType.scale, Decimal.ROUND_HALF_UP, !ansiEnabled)
private[this] def castToDecimal(from: DataType, target: DecimalType): Any => Any = from match {
case StringType if !ansiEnabled =>
buildCast[UTF8String](_, s => {
val d = Decimal.fromString(s)
if (d == null) null else changePrecision(d, target)
})
case StringType if ansiEnabled =>
buildCast[UTF8String](_, s => changePrecision(Decimal.fromStringANSI(s), target))
case BooleanType =>
buildCast[Boolean](_, b => toPrecision(if (b) Decimal.ONE else Decimal.ZERO, target))
case DateType =>
buildCast[Int](_, d => null) // date can't cast to decimal in Hive
case TimestampType =>
// Note that we lose precision here.
buildCast[Long](_, t => changePrecision(Decimal(timestampToDouble(t)), target))
case dt: DecimalType =>
b => toPrecision(b.asInstanceOf[Decimal], target)
case t: IntegralType =>
b => changePrecision(Decimal(t.integral.asInstanceOf[Integral[Any]].toLong(b)), target)
case x: FractionalType =>
b => try {
changePrecision(Decimal(x.fractional.asInstanceOf[Fractional[Any]].toDouble(b)), target)
} catch {
case _: NumberFormatException => null
}
}
// DoubleConverter
private[this] def castToDouble(from: DataType): Any => Any = from match {
case StringType =>
buildCast[UTF8String](_, s => {
val doubleStr = s.toString
try doubleStr.toDouble catch {
case _: NumberFormatException =>
val d = Cast.processFloatingPointSpecialLiterals(doubleStr, false)
if(ansiEnabled && d == null) {
throw new NumberFormatException(s"invalid input syntax for type numeric: $s")
} else {
d
}
}
})
case BooleanType =>
buildCast[Boolean](_, b => if (b) 1d else 0d)
case DateType =>
buildCast[Int](_, d => null)
case TimestampType =>
buildCast[Long](_, t => timestampToDouble(t))
case x: NumericType =>
b => x.numeric.asInstanceOf[Numeric[Any]].toDouble(b)
}
// FloatConverter
private[this] def castToFloat(from: DataType): Any => Any = from match {
case StringType =>
buildCast[UTF8String](_, s => {
val floatStr = s.toString
try floatStr.toFloat catch {
case _: NumberFormatException =>
val f = Cast.processFloatingPointSpecialLiterals(floatStr, true)
if (ansiEnabled && f == null) {
throw new NumberFormatException(s"invalid input syntax for type numeric: $s")
} else {
f
}
}
})
case BooleanType =>
buildCast[Boolean](_, b => if (b) 1f else 0f)
case DateType =>
buildCast[Int](_, d => null)
case TimestampType =>
buildCast[Long](_, t => timestampToDouble(t).toFloat)
case x: NumericType =>
b => x.numeric.asInstanceOf[Numeric[Any]].toFloat(b)
}
private[this] def castArray(fromType: DataType, toType: DataType): Any => Any = {
val elementCast = cast(fromType, toType)
// TODO: Could be faster?
buildCast[ArrayData](_, array => {
val values = new Array[Any](array.numElements())
array.foreach(fromType, (i, e) => {
if (e == null) {
values(i) = null
} else {
values(i) = elementCast(e)
}
})
new GenericArrayData(values)
})
}
private[this] def castMap(from: MapType, to: MapType): Any => Any = {
val keyCast = castArray(from.keyType, to.keyType)
val valueCast = castArray(from.valueType, to.valueType)
buildCast[MapData](_, map => {
val keys = keyCast(map.keyArray()).asInstanceOf[ArrayData]
val values = valueCast(map.valueArray()).asInstanceOf[ArrayData]
new ArrayBasedMapData(keys, values)
})
}
private[this] def castStruct(from: StructType, to: StructType): Any => Any = {
val castFuncs: Array[(Any) => Any] = from.fields.zip(to.fields).map {
case (fromField, toField) => cast(fromField.dataType, toField.dataType)
}
// TODO: Could be faster?
buildCast[InternalRow](_, row => {
val newRow = new GenericInternalRow(from.fields.length)
var i = 0
while (i < row.numFields) {
newRow.update(i,
if (row.isNullAt(i)) null else castFuncs(i)(row.get(i, from.apply(i).dataType)))
i += 1
}
newRow
})
}
private[this] def cast(from: DataType, to: DataType): Any => Any = {
// If the cast does not change the structure, then we don't really need to cast anything.
// We can return what the children return. Same thing should happen in the codegen path.
if (DataType.equalsStructurally(from, to)) {
identity
} else if (from == NullType) {
// According to `canCast`, NullType can be casted to any type.
// For primitive types, we don't reach here because the guard of `nullSafeEval`.
// But for nested types like struct, we might reach here for nested null type field.
// We won't call the returned function actually, but returns a placeholder.
_ => throw new SparkException(s"should not directly cast from NullType to $to.")
} else {
to match {
case dt if dt == from => identity[Any]
case StringType => castToString(from)
case BinaryType => castToBinary(from)
case DateType => castToDate(from)
case decimal: DecimalType => castToDecimal(from, decimal)
case TimestampType => castToTimestamp(from)
case CalendarIntervalType => castToInterval(from)
case BooleanType => castToBoolean(from)
case ByteType => castToByte(from)
case ShortType => castToShort(from)
case IntegerType => castToInt(from)
case FloatType => castToFloat(from)
case LongType => castToLong(from)
case DoubleType => castToDouble(from)
case array: ArrayType =>
castArray(from.asInstanceOf[ArrayType].elementType, array.elementType)
case map: MapType => castMap(from.asInstanceOf[MapType], map)
case struct: StructType => castStruct(from.asInstanceOf[StructType], struct)
case udt: UserDefinedType[_] if udt.acceptsType(from) =>
identity[Any]
case _: UserDefinedType[_] =>
throw new SparkException(s"Cannot cast $from to $to.")
}
}
}
private[this] lazy val cast: Any => Any = cast(child.dataType, dataType)
protected override def nullSafeEval(input: Any): Any = cast(input)
override def genCode(ctx: CodegenContext): ExprCode = {
// If the cast does not change the structure, then we don't really need to cast anything.
// We can return what the children return. Same thing should happen in the interpreted path.
if (DataType.equalsStructurally(child.dataType, dataType)) {
child.genCode(ctx)
} else {
super.genCode(ctx)
}
}
override def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
val eval = child.genCode(ctx)
val nullSafeCast = nullSafeCastFunction(child.dataType, dataType, ctx)
ev.copy(code = eval.code +
castCode(ctx, eval.value, eval.isNull, ev.value, ev.isNull, dataType, nullSafeCast))
}
// The function arguments are: `input`, `result` and `resultIsNull`. We don't need `inputIsNull`
// in parameter list, because the returned code will be put in null safe evaluation region.
private[this] type CastFunction = (ExprValue, ExprValue, ExprValue) => Block
private[this] def nullSafeCastFunction(
from: DataType,
to: DataType,
ctx: CodegenContext): CastFunction = to match {
case _ if from == NullType => (c, evPrim, evNull) => code"$evNull = true;"
case _ if to == from => (c, evPrim, evNull) => code"$evPrim = $c;"
case StringType => castToStringCode(from, ctx)
case BinaryType => castToBinaryCode(from)
case DateType => castToDateCode(from, ctx)
case decimal: DecimalType => castToDecimalCode(from, decimal, ctx)
case TimestampType => castToTimestampCode(from, ctx)
case CalendarIntervalType => castToIntervalCode(from)
case BooleanType => castToBooleanCode(from)
case ByteType => castToByteCode(from, ctx)
case ShortType => castToShortCode(from, ctx)
case IntegerType => castToIntCode(from, ctx)
case FloatType => castToFloatCode(from, ctx)
case LongType => castToLongCode(from, ctx)
case DoubleType => castToDoubleCode(from, ctx)
case array: ArrayType =>
castArrayCode(from.asInstanceOf[ArrayType].elementType, array.elementType, ctx)
case map: MapType => castMapCode(from.asInstanceOf[MapType], map, ctx)
case struct: StructType => castStructCode(from.asInstanceOf[StructType], struct, ctx)
case udt: UserDefinedType[_] if udt.acceptsType(from) =>
(c, evPrim, evNull) => code"$evPrim = $c;"
case _: UserDefinedType[_] =>
throw new SparkException(s"Cannot cast $from to $to.")
}
// Since we need to cast input expressions recursively inside ComplexTypes, such as Map's
// Key and Value, Struct's field, we need to name out all the variable names involved in a cast.
private[this] def castCode(ctx: CodegenContext, input: ExprValue, inputIsNull: ExprValue,
result: ExprValue, resultIsNull: ExprValue, resultType: DataType, cast: CastFunction): Block = {
val javaType = JavaCode.javaType(resultType)
code"""
boolean $resultIsNull = $inputIsNull;
$javaType $result = ${CodeGenerator.defaultValue(resultType)};
if (!$inputIsNull) {
${cast(input, result, resultIsNull)}
}
"""
}
private def appendIfNotLegacyCastToStr(buffer: ExprValue, s: String): Block = {
if (!legacyCastToStr) code"""$buffer.append("$s");""" else EmptyBlock
}
private def writeArrayToStringBuilder(
et: DataType,
array: ExprValue,
buffer: ExprValue,
ctx: CodegenContext): Block = {
val elementToStringCode = castToStringCode(et, ctx)
val funcName = ctx.freshName("elementToString")
val element = JavaCode.variable("element", et)
val elementStr = JavaCode.variable("elementStr", StringType)
val elementToStringFunc = inline"${ctx.addNewFunction(funcName,
s"""
|private UTF8String $funcName(${CodeGenerator.javaType(et)} $element) {
| UTF8String $elementStr = null;
| ${elementToStringCode(element, elementStr, null /* resultIsNull won't be used */)}
| return elementStr;
|}
""".stripMargin)}"
val loopIndex = ctx.freshVariable("loopIndex", IntegerType)
code"""
|$buffer.append("[");
|if ($array.numElements() > 0) {
| if ($array.isNullAt(0)) {
| ${appendIfNotLegacyCastToStr(buffer, "null")}
| } else {
| $buffer.append($elementToStringFunc(${CodeGenerator.getValue(array, et, "0")}));
| }
| for (int $loopIndex = 1; $loopIndex < $array.numElements(); $loopIndex++) {
| $buffer.append(",");
| if ($array.isNullAt($loopIndex)) {
| ${appendIfNotLegacyCastToStr(buffer, " null")}
| } else {
| $buffer.append(" ");
| $buffer.append($elementToStringFunc(${CodeGenerator.getValue(array, et, loopIndex)}));
| }
| }
|}
|$buffer.append("]");
""".stripMargin
}
private def writeMapToStringBuilder(
kt: DataType,
vt: DataType,
map: ExprValue,
buffer: ExprValue,
ctx: CodegenContext): Block = {
def dataToStringFunc(func: String, dataType: DataType) = {
val funcName = ctx.freshName(func)
val dataToStringCode = castToStringCode(dataType, ctx)
val data = JavaCode.variable("data", dataType)
val dataStr = JavaCode.variable("dataStr", StringType)
val functionCall = ctx.addNewFunction(funcName,
s"""
|private UTF8String $funcName(${CodeGenerator.javaType(dataType)} $data) {
| UTF8String $dataStr = null;
| ${dataToStringCode(data, dataStr, null /* resultIsNull won't be used */)}
| return dataStr;
|}
""".stripMargin)
inline"$functionCall"
}
val keyToStringFunc = dataToStringFunc("keyToString", kt)
val valueToStringFunc = dataToStringFunc("valueToString", vt)
val loopIndex = ctx.freshVariable("loopIndex", IntegerType)
val mapKeyArray = JavaCode.expression(s"$map.keyArray()", classOf[ArrayData])
val mapValueArray = JavaCode.expression(s"$map.valueArray()", classOf[ArrayData])
val getMapFirstKey = CodeGenerator.getValue(mapKeyArray, kt, JavaCode.literal("0", IntegerType))
val getMapFirstValue = CodeGenerator.getValue(mapValueArray, vt,
JavaCode.literal("0", IntegerType))
val getMapKeyArray = CodeGenerator.getValue(mapKeyArray, kt, loopIndex)
val getMapValueArray = CodeGenerator.getValue(mapValueArray, vt, loopIndex)
code"""
|$buffer.append("$leftBracket");
|if ($map.numElements() > 0) {
| $buffer.append($keyToStringFunc($getMapFirstKey));
| $buffer.append(" ->");
| if ($map.valueArray().isNullAt(0)) {
| ${appendIfNotLegacyCastToStr(buffer, " null")}
| } else {
| $buffer.append(" ");
| $buffer.append($valueToStringFunc($getMapFirstValue));
| }
| for (int $loopIndex = 1; $loopIndex < $map.numElements(); $loopIndex++) {
| $buffer.append(", ");
| $buffer.append($keyToStringFunc($getMapKeyArray));