gengliangwang commented on a change in pull request #25461:
[SPARK-28741][SQL]Throw exceptions when casting to integers causes overflow
URL: https://github.com/apache/spark/pull/25461#discussion_r316707668
##########
File path: sql/catalyst/src/main/scala/org/apache/spark/sql/types/Decimal.scala
##########
@@ -232,12 +232,149 @@ final class Decimal extends Ordered[Decimal] with
Serializable {
}
}
+ /**
+ * @return the Long value that is equal to the rounded decimal.
+ * @throws ArithmeticException if checkOverflow is true and
+ * the decimal too big to fit in Long type.
+ */
+ def toLong(checkOverflow: Boolean): Long = {
+ if (!checkOverflow) {
+ toLong
+ } else {
+ roundToLong()
+ }
+ }
+
def toInt: Int = toLong.toInt
+ /**
+ * @return the Int value that is equal to the rounded decimal.
+ * @throws ArithmeticException if checkOverflow is true and
+ * the decimal too big to fit in Int type.
+ */
+ def toInt(checkOverflow: Boolean): Int = {
+ if (!checkOverflow) {
+ toInt
+ } else {
+ roundToInt()
+ }
+ }
+
def toShort: Short = toLong.toShort
+ /**
+ * @return the Short value that is equal to the rounded decimal.
+ * @throws ArithmeticException if checkOverflow is true and
+ * the decimal is too big to fit in Short type.
+ */
+ def toShort(checkOverflow: Boolean): Short = {
+ if (!checkOverflow) {
+ toShort
+ } else {
+ roundToShort()
+ }
+ }
+
def toByte: Byte = toLong.toByte
+ /**
+ * @return the Byte value that is equal to the rounded decimal.
+ * @throws ArithmeticException if checkOverflow is true and
+ * the decimal is too big to fit in Byte type.
+ */
+ def toByte(checkOverflow: Boolean): Byte = {
+ if (!checkOverflow) {
+ toByte
+ } else {
+ roundToByte()
+ }
+ }
+
+ private def overflowException(dataType: String) =
+ throw new ArithmeticException(s"Casting $this to $dataType causes
overflow.")
+
+ /**
+ * @return the Byte value that is equal to the rounded decimal.
+ * @throws ArithmeticException if the decimal is too big to fit in Byte type.
+ */
+ private def roundToByte(): Byte = {
+ if (decimalVal.eq(null)) {
+ val actualLongVal = longVal / POW_10(_scale)
+ if (actualLongVal == actualLongVal.toByte) {
+ actualLongVal.toByte
+ } else {
+ overflowException("byte")
+ }
+ } else {
+ val doubleVal = decimalVal.toDouble
+ if (Math.floor(doubleVal) <= Byte.MaxValue && Math.ceil(doubleVal) >=
Byte.MinValue) {
+ doubleVal.toByte
+ } else {
+ overflowException("byte")
+ }
+ }
+ }
+
+ /**
+ * @return the Short value that is equal to the rounded decimal.
+ * @throws ArithmeticException if the decimal is too big to fit in Short
type.
+ */
+ private def roundToShort(): Short = {
+ if (decimalVal.eq(null)) {
+ val actualLongVal = longVal / POW_10(_scale)
+ if (actualLongVal == actualLongVal.toShort) {
+ actualLongVal.toShort
+ } else {
+ overflowException("short")
+ }
+ } else {
+ val doubleVal = decimalVal.toDouble
+ if (Math.floor(doubleVal) <= Short.MaxValue && Math.ceil(doubleVal) >=
Short.MinValue) {
+ doubleVal.toShort
+ } else {
+ overflowException("short")
+ }
+ }
+ }
+
+ /**
+ * @return the Int value that is equal to the rounded decimal.
+ * @throws ArithmeticException if the decimal too big to fit in Int type.
+ */
+ private def roundToInt(): Int = {
+ if (decimalVal.eq(null)) {
+ val actualLongVal = longVal / POW_10(_scale)
+ if (actualLongVal == actualLongVal.toInt) {
+ actualLongVal.toInt
+ } else {
+ overflowException("int")
+ }
+ } else {
+ val doubleVal = decimalVal.toDouble
+ if (Math.floor(doubleVal) <= Int.MaxValue && Math.ceil(doubleVal) >=
Int.MinValue) {
+ doubleVal.toInt
+ } else {
+ overflowException("int")
+ }
+ }
+ }
+
+ /**
+ * @return the Long value that is equal to the rounded decimal.
+ * @throws ArithmeticException if the decimal too big to fit in Long type.
+ */
+ private def roundToLong(): Long = {
+ if (decimalVal.eq(null)) {
+ longVal / POW_10(_scale)
+ } else {
+ try {
+ decimalVal.bigDecimal.toBigInteger.longValueExact()
Review comment:
I think the current implementation is simple and accurate.
If we convert the value to double, then it won't be accurate;
If we compare the value with another `Decimal`, then internally both values
are converted to `BigDecimal`.
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