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decimalFunctions.scala
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decimalFunctions.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 org.apache.spark.sql.catalyst.expressions.codegen.{GeneratedExpressionCode, Code, CodeGenContext}
import org.apache.spark.sql.types._
/** Return the unscaled Long value of a Decimal, assuming it fits in a Long */
case class UnscaledValue(child: Expression) extends UnaryExpression {
override def dataType: DataType = LongType
override def foldable: Boolean = child.foldable
override def nullable: Boolean = child.nullable
override def toString: String = s"UnscaledValue($child)"
override def eval(input: Row): Any = {
val childResult = child.eval(input)
if (childResult == null) {
null
} else {
childResult.asInstanceOf[Decimal].toUnscaledLong
}
}
override def genCode(ctx: CodeGenContext, ev: GeneratedExpressionCode): Code = {
defineCodeGen(ctx, ev, c => s"$c.toUnscaledLong()")
}
}
/** Create a Decimal from an unscaled Long value */
case class MakeDecimal(child: Expression, precision: Int, scale: Int) extends UnaryExpression {
override def dataType: DataType = DecimalType(precision, scale)
override def foldable: Boolean = child.foldable
override def nullable: Boolean = child.nullable
override def toString: String = s"MakeDecimal($child,$precision,$scale)"
override def eval(input: Row): Decimal = {
val childResult = child.eval(input)
if (childResult == null) {
null
} else {
new Decimal().setOrNull(childResult.asInstanceOf[Long], precision, scale)
}
}
override def genCode(ctx: CodeGenContext, ev: GeneratedExpressionCode): Code = {
val eval = child.gen(ctx)
eval.code + s"""
boolean ${ev.isNull} = ${eval.isNull};
${ctx.decimalType} ${ev.primitive} = null;
if (!${ev.isNull}) {
${ev.primitive} = (new ${ctx.decimalType}()).setOrNull(
${eval.primitive}, $precision, $scale);
${ev.isNull} = ${ev.primitive} == null;
}
"""
}
}