org.apache.flink.table.expressions.windowProperties.scala Maven / Gradle / Ivy
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package org.apache.flink.table.expressions
import org.apache.flink.table.calcite.FlinkRelBuilder.NamedWindowProperty
import org.apache.flink.table.plan.logical.LogicalExprVisitor
import org.apache.flink.table.types.{DataTypes, InternalType}
import org.apache.flink.table.validate.{ValidationFailure, ValidationSuccess}
import org.apache.calcite.rex.RexNode
import org.apache.calcite.tools.RelBuilder
trait WindowProperty {
def toNamedWindowProperty(name: String): NamedWindowProperty
def resultType: InternalType
}
abstract class AbstractWindowProperty(child: Expression)
extends UnaryExpression
with WindowProperty {
override def toString = s"WindowProperty($child)"
override private[flink] def toRexNode(implicit relBuilder: RelBuilder): RexNode =
throw new UnsupportedOperationException("WindowProperty cannot be transformed to RexNode.")
override private[flink] def validateInput() =
if (child.isInstanceOf[WindowReference]) {
ValidationSuccess
} else {
ValidationFailure("Child must be a window reference.")
}
def toNamedWindowProperty(name: String): NamedWindowProperty = NamedWindowProperty(name, this)
}
case class WindowStart(child: Expression) extends AbstractWindowProperty(child) {
override def resultType = DataTypes.TIMESTAMP
override def toString: String = s"start($child)"
override def accept[T](logicalExprVisitor: LogicalExprVisitor[T]): T =
logicalExprVisitor.visit(this)
}
case class WindowEnd(child: Expression) extends AbstractWindowProperty(child) {
override def resultType = DataTypes.TIMESTAMP
override def toString: String = s"end($child)"
override def accept[T](logicalExprVisitor: LogicalExprVisitor[T]): T =
logicalExprVisitor.visit(this)
}