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

Class CountStar

Object

org.apache.spark.sql.internal.connector.ExpressionWithToString

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

All Implemented Interfaces:

Serializable, AggregateFunc, Expression, scala.Serializable

@Evolving
public final class CountStar
extends org.apache.spark.sql.internal.connector.ExpressionWithToString
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, EMPTY_NAMED_REFERENCE

Constructor Summary

Constructors

Constructor	Description
CountStar()

Method Summary

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

Methods inherited from class org.apache.spark.sql.internal.connector.ExpressionWithToString

describe, references, toString

Methods inherited from class java.lang.Object

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

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

describe, references

Constructor Details

CountStar

public CountStar()

Method Details

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