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

Class Count

Object

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

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

All Implemented Interfaces:

java.io.Serializable, AggregateFunc, Expression

@Evolving
public final class Count
extends org.apache.spark.sql.internal.connector.ExpressionWithToString
implements AggregateFunc

An aggregate function that returns the number of the specific row 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 and Description
Count(Expression column, boolean isDistinct)

Method Summary

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

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

describe, references, 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

Count

public Count(Expression column,
             boolean isDistinct)

Method Detail

column

public Expression column()

isDistinct

public boolean isDistinct()

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