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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.InternalRow
import org.apache.spark.sql.catalyst.expressions.codegen.CodegenFallback
import org.apache.spark.sql.types._
/**
* A placeholder expression for cube/rollup, which will be replaced by analyzer
*/
trait GroupingSet extends Expression with CodegenFallback {
def groupByExprs: Seq[Expression]
override def children: Seq[Expression] = groupByExprs
// this should be replaced first
override lazy val resolved: Boolean = false
override def dataType: DataType = throw new UnsupportedOperationException
override def foldable: Boolean = false
override def nullable: Boolean = true
override def eval(input: InternalRow): Any = throw new UnsupportedOperationException
}
case class Cube(groupByExprs: Seq[Expression]) extends GroupingSet {}
case class Rollup(groupByExprs: Seq[Expression]) extends GroupingSet {}
/**
* Indicates whether a specified column expression in a GROUP BY list is aggregated or not.
* GROUPING returns 1 for aggregated or 0 for not aggregated in the result set.
*/
case class Grouping(child: Expression) extends Expression with Unevaluable {
override def references: AttributeSet = AttributeSet(VirtualColumn.groupingIdAttribute :: Nil)
override def children: Seq[Expression] = child :: Nil
override def dataType: DataType = ByteType
override def nullable: Boolean = false
}
/**
* GroupingID is a function that computes the level of grouping.
*
* If groupByExprs is empty, it means all grouping expressions in GroupingSets.
*/
case class GroupingID(groupByExprs: Seq[Expression]) extends Expression with Unevaluable {
override def references: AttributeSet = AttributeSet(VirtualColumn.groupingIdAttribute :: Nil)
override def children: Seq[Expression] = groupByExprs
override def dataType: DataType = IntegerType
override def nullable: Boolean = false
override def prettyName: String = "grouping_id"
}
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