org.apache.flink.table.codegen.expr.Sum0AggFunction.scala Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
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* 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
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*/
package org.apache.flink.table.codegen.expr
import org.apache.flink.table.api.functions.DeclarativeAggregateFunction
import org.apache.flink.table.api.scala._
import org.apache.flink.table.dataformat.Decimal
import org.apache.flink.table.expressions._
import org.apache.flink.table.types.{DataTypes, DecimalType, InternalType}
import java.math.{BigDecimal => JBigDecimal}
/**
* built-in sum0 aggregate function
*/
abstract class Sum0AggFunction extends DeclarativeAggregateFunction {
override def inputCount: Int = 1
private lazy val sum0 = UnresolvedAggBufferReference("sum0", getResultType)
override def aggBufferAttributes: Seq[UnresolvedAggBufferReference] = Seq(sum0)
override def initialValuesExpressions: Seq[Expression] = Seq(
/* sum0 = */ Literal(0L, getResultType)
)
override def accumulateExpressions: Seq[Expression] = Seq(
/* sum0 = */ IsNull(operands(0)) ? (sum0, sum0 + operands(0))
)
override def retractExpressions: Seq[Expression] = Seq(
/* sum0 = */ IsNull(operands(0)) ? (sum0, sum0 - operands(0))
)
override def mergeExpressions: Seq[Expression] = Seq(sum0.right + sum0.left)
override def getValueExpression: Expression = sum0
}
/**
* Built-in Int Sum0 aggregate function
*/
class IntSum0AggFunction extends Sum0AggFunction {
override def getResultType: InternalType = DataTypes.INT
}
/**
* Built-in Byte Sum0 aggregate function
*/
class ByteSum0AggFunction extends Sum0AggFunction {
override def getResultType: InternalType = DataTypes.BYTE
}
/**
* Built-in Short Sum0 aggregate function
*/
class ShortSum0AggFunction extends Sum0AggFunction {
override def getResultType: InternalType = DataTypes.SHORT
}
/**
* Built-in Long Sum0 aggregate function
*/
class LongSum0AggFunction extends Sum0AggFunction {
override def getResultType: InternalType = DataTypes.LONG
}
/**
* Built-in Float Sum0 aggregate function
*/
class FloatSum0AggFunction extends Sum0AggFunction {
override def getResultType(): InternalType = DataTypes.FLOAT
override def initialValuesExpressions: Seq[Expression] = Seq(
/* sum0 = */ Literal(0.0f, getResultType)
)
}
/**
* Built-in Double Sum0 aggregate function
*/
class DoubleSum0AggFunction extends Sum0AggFunction {
override def getResultType: InternalType = DataTypes.DOUBLE
override def initialValuesExpressions: Seq[Expression] = Seq(
/* sum0 = */ Literal(0.0d, getResultType)
)
}
/**
* Built-in Decimal Sum0 aggregate function
*/
class DecimalSum0AggFunction(argType: DecimalType)
extends Sum0AggFunction {
override def initialValuesExpressions: Seq[Expression] = Seq(
/* sum0 = */ Literal(new JBigDecimal(0), getResultType)
)
override def getResultType: InternalType =
Decimal.inferAggSumType(argType.precision, argType.scale)
}