org.apache.spark.sql.connector.expressions.aggregate

Class CountStar

Object

org.apache.spark.sql.connector.expressions.aggregate.CountStar

All Implemented Interfaces:

java.io.Serializable, AggregateFunc, Expression

@Evolving
public final class CountStar
extends Object
implements AggregateFunc

An aggregate function that returns the number of rows in a group.

Since:

3.2.0

See Also:

Serialized Form

Field Summary

Fields inherited from interface org.apache.spark.sql.connector.expressions.Expression

EMPTY_EXPRESSION

Constructor Summary

Constructors

Constructor and Description
CountStar()

Method Summary

Modifier and Type	Method and Description
Expression[]	children() Returns an array of the children of this node.
String	toString()

Methods inherited from class Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.spark.sql.connector.expressions.Expression

describe, references

Constructor Detail

CountStar

public CountStar()

Method Detail

children

public Expression[] children()

Description copied from interface: Expression

Returns an array of the children of this node. Children should not change.

Specified by:

children in interface Expression

toString

public String toString()

Overrides:

toString in class Object