org.apache.flink.api.table.plan

Class GroupBy

java.lang.Object

org.apache.flink.api.table.trees.TreeNode<PlanNode>

org.apache.flink.api.table.plan.PlanNode

org.apache.flink.api.table.plan.GroupBy

All Implemented Interfaces:

Serializable, scala.Equals, scala.Product

public class GroupBy
extends PlanNode
implements scala.Product, scala.Serializable

Grouping operation. Keys are specified using field references. A group by operation os only useful when performing a select with aggregates afterwards.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
GroupBy(PlanNode input, scala.collection.Seq<Expression> fields)

Method Summary

Modifier and Type	Method and Description
scala.collection.Seq<PlanNode>	children() List of child nodes that should be considered when doing transformations.
scala.collection.Seq<Expression>	fields()
PlanNode	input()
scala.collection.Seq<scala.Tuple2<String,TypeInformation<?>>>	outputFields()
String	toString()

Methods inherited from class org.apache.flink.api.table.trees.TreeNode

exists, fastEquals, makeCopy, transformChildrenPost, transformChildrenPre, transformPost, transformPre

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface scala.Product

productArity, productElement, productIterator, productPrefix

Methods inherited from interface scala.Equals

canEqual, equals

Constructor Detail

GroupBy

public GroupBy(PlanNode input,
               scala.collection.Seq<Expression> fields)

Method Detail

input

public PlanNode input()

fields

public scala.collection.Seq<Expression> fields()

children

public scala.collection.Seq<PlanNode> children()

Description copied from class: TreeNode

List of child nodes that should be considered when doing transformations. Other values in the Product will not be transformed, only handed through.

Specified by:

children in class TreeNode<PlanNode>

outputFields

public scala.collection.Seq<scala.Tuple2<String,TypeInformation<?>>> outputFields()

Specified by:

outputFields in class PlanNode

toString

public String toString()

Overrides:

toString in class Object