vinodkc commented on code in PR #38419:
URL: https://github.com/apache/spark/pull/38419#discussion_r1080701463
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/mathExpressions.scala:
##########
@@ -331,6 +332,268 @@ case class RoundCeil(child: Expression, scale: Expression)
copy(child = newLeft, scale = newRight)
}
+case class TruncNumber(child: Expression, scale: Expression)
+ extends BaseBinaryExpression with NullIntolerant {
+
+ override protected def withNewChildrenInternal(
+ newLeft: Expression,
+ newRight: Expression): TruncNumber = copy(child = newLeft, scale =
newRight)
+
+ /**
+ * Returns Java source code that can be compiled to evaluate this
expression. The default
+ * behavior is to call the eval method of the expression. Concrete
expression implementations
+ * should override this to do actual code generation.
+ *
+ * @param ctx
+ * a [[CodegenContext]]
+ * @param ev
+ * an [[ExprCode]] with unique terms.
+ * @return
+ * an [[ExprCode]] containing the Java source code to generate the given
expression
+ */
+ override protected def doGenCode(ctx: CodegenContext, ev: ExprCode):
ExprCode =
+ defineCodeGen(
+ ctx,
+ ev,
+ (input, _) => {
+ dataType match {
+ case ByteType if (_scale <= 0) =>
+
s"""(byte)(org.apache.spark.sql.catalyst.expressions.TruncNumber.trunc(
+ |(long)$input, ${_scale}))""".stripMargin
+ case ShortType if (_scale <= 0) =>
+
s"""(short)(org.apache.spark.sql.catalyst.expressions.TruncNumber.trunc(
+ |(long)$input, ${_scale}))""".stripMargin
+ case IntegerType if (_scale <= 0) =>
+
s"""(int)(org.apache.spark.sql.catalyst.expressions.TruncNumber.trunc(
+ |(long)$input, ${_scale}))""".stripMargin
+ case LongType if (_scale <= 0) =>
+ s"""(org.apache.spark.sql.catalyst.expressions.TruncNumber.trunc(
+ |$input, ${_scale}))""".stripMargin
+ case FloatType if (_scale <= 0) =>
+ s"""org.apache.spark.sql.catalyst.expressions.TruncNumber.trunc(
+ |$input, ${_scale}).floatValue()""".stripMargin
+ case DoubleType if (_scale <= 0) =>
+ s"""org.apache.spark.sql.catalyst.expressions.TruncNumber.trunc(
+ |$input, ${_scale}).doubleValue()""".stripMargin
+ case DecimalType.Fixed(_, _) =>
+ s"""Decimal.apply(
+ |org.apache.spark.sql.catalyst.expressions.TruncNumber.trunc(
+ |${input}.toJavaBigDecimal(), ${_scale}))""".stripMargin
+ case _ => s"$input"
+ }
+ })
+
+ /**
+ * Returns the [[DataType]] of the result of evaluating this expression. It
is invalid to query
+ * the dataType of an unresolved expression (i.e., when `resolved` == false).
+ */
+ override lazy val dataType: DataType = {
+ child.dataType match {
+ case DecimalType.Fixed(p, s) =>
+ val newPosition =
+ if (_scale > 0) {
+ if (_scale >= s) {
+ s
+ } else {
+ _scale
+ }
+ } else {
+ 0
+ }
+ DecimalType(p - s + newPosition, newPosition)
+ case t => t
+ }
+ }
+
+ /**
+ * Called by default [[eval]] implementation. If subclass of
BinaryExpression keep the default
+ * nullability, they can override this method to save null-check code. If we
need full control
+ * of evaluation process, we should override [[eval]].
+ */
+ override protected def nullSafeEval(input1: Any, input2: Any): Any = {
+ dataType match {
+ case ByteType if (_scale <= 0) =>
+ TruncNumber.trunc(input1.asInstanceOf[Byte].toLong, _scale).toByte
+ case ShortType if (_scale <= 0) =>
+ TruncNumber.trunc(input1.asInstanceOf[Short].toLong, _scale).shortValue
+ case IntegerType if (_scale <= 0) =>
+ TruncNumber.trunc(input1.asInstanceOf[Int].toLong, _scale).intValue
+ case LongType if (_scale <= 0) =>
+ TruncNumber.trunc(input1.asInstanceOf[Long], _scale).longValue
+ case FloatType =>
+ TruncNumber.trunc(input1.asInstanceOf[Float], _scale).floatValue
+ case DoubleType =>
+ TruncNumber.trunc(input1.asInstanceOf[Double], _scale).doubleValue
+ case DecimalType.Fixed(p, s) =>
+
Decimal(TruncNumber.trunc(input1.asInstanceOf[Decimal].toJavaBigDecimal,
_scale))
+ case _ => input1
+ }
+ }
+}
+
+object TruncNumber {
+ /**
+ * To truncate whole numbers ; byte, short, int, long types
+ */
+ def trunc(input: Long, position: Int): Long = {
+ if (position >= 0) {
+ input
+ } else {
+ // position is -ve, truncate the number by absolute value of position
+ // eg: input 123 , scale -2 , result 100
+ val pow = Math.pow(10, Math.abs(position)).toLong
+ (input / pow) * pow
+ }
+ }
+
+ /**
+ * To truncate double and float type
+ */
+ def trunc(input: Double, position: Int): BigDecimal = {
+ trunc(jm.BigDecimal.valueOf(input), position)
+ }
+
+ /**
+ * To truncate decimal type
+ */
+ def trunc(input: jm.BigDecimal, position: Int): jm.BigDecimal = {
+ if (input.scale < position) {
+ input
+ } else {
+ val wholePart = input.toBigInteger
+ if (position > 0) {
+ // position is +ve , truncate only the decimal part by value of
position
+ val pow = jm.BigDecimal.valueOf(Math.pow(10, position).toLong)
+ val decimalPart = input.remainder(java.math.BigDecimal.ONE)
+ // To avoid overflow while multiplication, extract decimal part first,
+ // truncate it and then add it to whole part
+ // eg: input 123.456, scale 2, result 123.45
+ if (jm.BigDecimal.ZERO.compareTo(decimalPart) == 0) {
+ new jm.BigDecimal(wholePart)
+ } else {
+ val newRemainder = new
jm.BigDecimal(decimalPart.multiply(pow).toBigInteger).divide(pow)
+ new jm.BigDecimal(wholePart).add(newRemainder)
+ }
+ } else if (position == 0) {
+ // position is 0, extract whole part
+ // eg: input 123.456, scale 0, result 123
+ new jm.BigDecimal(wholePart)
+ } else {
+ // position is -ve, truncate the whole part by absolute value of
position
+ // eg: input 123.456, scale -2, result 100
+ if (jm.BigInteger.ZERO.compareTo(wholePart) == 0) {
+ new jm.BigDecimal(wholePart)
+ } else {
+ val pow = jm.BigInteger.valueOf(Math.pow(10,
Math.abs(position)).toLong)
+ new jm.BigDecimal(wholePart.divide(pow).multiply(pow), 0)
+ }
+ }
+ }
+ }
+}
+
+// scalastyle:off line.size.limit
+@ExpressionDescription(
+ usage = """_FUNC_(number[, position]) - Returns the number after truncated
to the specified places.
+ An optional `position` parameter can be specified to truncate digits to
the right of the decimal point.
+ If 0, it removes all the decimal values and returns only the integer.
+ If negative, the number is truncated to the left side of the decimal point.
+ There is an overloaded version of this function to truncate date values
+ _FUNC_(date, fmt) - Returns `date` with the time portion of the day
truncated to the unit specified by the format model `fmt`.
+ """,
+ arguments = """
+ Arguments:
+ * number - number to be truncated
+ * position - number of decimal places up to which the given number is to
be truncated
+ Arguments: To truncate date value:
+ * date - date value or valid date string
+ * fmt - the format representing the unit to be truncated to
+ - "YEAR", "YYYY", "YY" - truncate to the first date of the year that
the `date` falls in
+ - "QUARTER" - truncate to the first date of the quarter that the
`date` falls in
+ - "MONTH", "MM", "MON" - truncate to the first date of the month
that the `date` falls in
+ - "WEEK" - truncate to the Monday of the week that the `date` falls
in
+ """,
+ examples = """
+ Examples:
+ > SELECT _FUNC_('2019-08-04', 'week');
+ 2019-07-29
+ > SELECT _FUNC_('2019-08-04', 'quarter');
+ 2019-07-01
+ > SELECT _FUNC_('2009-02-12', 'MM');
+ 2009-02-01
+ > SELECT _FUNC_('2015-10-27', 'YEAR');
+ 2015-01-01
+ > SELECT _FUNC_(-10.11, 0);
+ -10
+ > SELECT _FUNC_(10.11, -1);
+ 10
+ > SELECT _FUNC_(100.61, 0);
+ 100
+ > SELECT _FUNC_(-19087.1560, -3);
+ -19000
+ > SELECT _FUNC_(10876.5489, -1);
+ 10870
+ > SELECT _FUNC_(-7767.1160, 2);
+ -7767.11
+ > SELECT _FUNC_(17646.6019, 3);
+ 17646.601
+ """,
+ since = "3.4.0",
+ group = "math_funcs")
+// scalastyle:on line.size.limit
+object TruncExpressionBuilder extends ExpressionBuilder {
+ override def build(funcName: String, expressions: Seq[Expression]):
Expression = {
+ val numArgs = expressions.length
+ if (numArgs >= 1) {
+ expressions(0).dataType match {
+ case ByteType | ShortType | IntegerType | LongType | FloatType |
DoubleType
+ | DecimalType.Fixed(_, _) => buildTruncNumber(funcName,
expressions)
+ case _ => buildTruncDate(funcName, expressions)
+ }
+ } else {
+ throw QueryCompilationErrors.invalidFunctionArgumentNumberError(Seq(2),
funcName, numArgs)
Review Comment:
Done
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