AggregateField

abstract class AggregateField

Known direct subclasses

AggregateField.AverageAggregateField, AggregateField.CountAggregateField, AggregateField.SumAggregateField

AggregateField.AverageAggregateField	Represents an "average" aggregation that can be performed by Firestore.
AggregateField.CountAggregateField	Represents a "count" aggregation that can be performed by Firestore.
AggregateField.SumAggregateField	Represents a "sum" aggregation that can be performed by Firestore.

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Represents an aggregation that can be performed by Firestore.

Summary

Nested types
class AggregateField.AverageAggregateField : AggregateField Represents an "average" aggregation that can be performed by Firestore.
class AggregateField.CountAggregateField : AggregateField Represents a "count" aggregation that can be performed by Firestore.
class AggregateField.SumAggregateField : AggregateField Represents a "sum" aggregation that can be performed by Firestore.

Public functions
java-static AggregateField.AverageAggregateField	average(field: String) Create an AverageAggregateField object that can be used to compute the average of a specified field over a range of documents in the result set of a query.
java-static AggregateField.AverageAggregateField	average(fieldPath: FieldPath) Create an AverageAggregateField object that can be used to compute the average of a specified field over a range of documents in the result set of a query.
java-static AggregateField.CountAggregateField	count() Create a CountAggregateField object that can be used to compute the count of documents in the result set of a query.
Boolean	equals(other: Any!) Returns true if the given object is equal to this object.
Int	hashCode() Calculates and returns the hash code for this object.
java-static AggregateField.SumAggregateField	sum(field: String) Create a SumAggregateField object that can be used to compute the sum of a specified field over a range of documents in the result set of a query.
java-static AggregateField.SumAggregateField	sum(fieldPath: FieldPath) Create a SumAggregateField object that can be used to compute the sum of a specified field over a range of documents in the result set of a query.

Public properties
String	alias
String	operator

Public functions

average

java-static fun average(field: String): AggregateField.AverageAggregateField

Create an AverageAggregateField object that can be used to compute the average of a specified field over a range of documents in the result set of a query.

The result of an average operation will always be a double or NaN.

• Averaging over zero documents or fields will result in a double value representing NaN.
• Averaging over NaN will result in a double value representing NaN.

Parameters
field: String	Specifies the field to average across the result set.

Returns
AggregateField.AverageAggregateField	The `AverageAggregateField` object that can be used to compute the average of a specified field over a range of documents in the result set of a query.

average

java-static fun average(fieldPath: FieldPath): AggregateField.AverageAggregateField

Create an AverageAggregateField object that can be used to compute the average of a specified field over a range of documents in the result set of a query.

The result of an average operation will always be a double or NaN.

• Averaging over zero documents or fields will result in a double value representing NaN.
• Averaging over NaN will result in a double value representing NaN.

Parameters
fieldPath: FieldPath	Specifies the field to average across the result set.

Returns
AggregateField.AverageAggregateField	The `AverageAggregateField` object that can be used to compute the average of a specified field over a range of documents in the result set of a query.

count

java-static fun count(): AggregateField.CountAggregateField

Create a CountAggregateField object that can be used to compute the count of documents in the result set of a query.

The result of a count operation will always be a 64-bit integer value.

Returns
AggregateField.CountAggregateField	The `CountAggregateField` object that can be used to compute the count of documents in the result set of a query.

equals

fun equals(other: Any!): Boolean

Returns true if the given object is equal to this object. Two `AggregateField` objects are considered equal if they have the same operator and operate on the same field.

hashCode

fun hashCode(): Int

Calculates and returns the hash code for this object.

sum

java-static fun sum(field: String): AggregateField.SumAggregateField

Create a SumAggregateField object that can be used to compute the sum of a specified field over a range of documents in the result set of a query.

The result of a sum operation will always be a 64-bit integer value, a double, or NaN.

• Summing over zero documents or fields will result in 0L.
• Summing over NaN will result in a double value representing NaN.
• A sum that overflows the maximum representable 64-bit integer value will result in a double return value. This may result in lost precision of the result.
• A sum that overflows the maximum representable double value will result in a double return value representing infinity.

Parameters
field: String	Specifies the field to sum across the result set.

Returns
AggregateField.SumAggregateField	The `SumAggregateField` object that can be used to compute the sum of a specified field over a range of documents in the result set of a query.

sum

java-static fun sum(fieldPath: FieldPath): AggregateField.SumAggregateField

Create a SumAggregateField object that can be used to compute the sum of a specified field over a range of documents in the result set of a query.

The result of a sum operation will always be a 64-bit integer value, a double, or NaN.

• Summing over zero documents or fields will result in 0L.
• Summing over NaN will result in a double value representing NaN.
• A sum that overflows the maximum representable 64-bit integer value will result in a double return value. This may result in lost precision of the result.
• A sum that overflows the maximum representable double value will result in a double return value representing infinity.

Parameters
fieldPath: FieldPath	Specifies the field to sum across the result set.

Returns
AggregateField.SumAggregateField	The `SumAggregateField` object that can be used to compute the sum of a specified field over a range of documents in the result set of a query.

Public properties

alias

val alias: String

operator

val operator: String