object Accumulators
Builders for accumulators used in the group pipeline stage of an aggregation pipeline.
- Since
1.0
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- Accumulators
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- def addToSet[TExpression](fieldName: String, expression: TExpression): BsonField
Gets a field name for a
$group
operation representing all unique values that results from applying the given expression to each document in a group of documents that share the same group by key.Gets a field name for a
$group
operation representing all unique values that results from applying the given expression to each document in a group of documents that share the same group by key.- TExpression
the expression type
- fieldName
the field name
- expression
the expression
- returns
the field
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- final def asInstanceOf[T0]: T0
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- def avg[TExpression](fieldName: String, expression: TExpression): BsonField
Gets a field name for a
$group
operation representing the average of the values of the given expression when applied to all members of the group.Gets a field name for a
$group
operation representing the average of the values of the given expression when applied to all members of the group.- TExpression
the expression type
- fieldName
the field name
- expression
the expression
- returns
the field
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- def clone(): AnyRef
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- protected[lang]
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- def first[TExpression](fieldName: String, expression: TExpression): BsonField
Gets a field name for a
$group
operation representing the value of the given expression when applied to the first member of the group.Gets a field name for a
$group
operation representing the value of the given expression when applied to the first member of the group.- TExpression
the expression type
- fieldName
the field name
- expression
the expression
- returns
the field
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- final def getClass(): Class[_ <: AnyRef]
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- final def isInstanceOf[T0]: Boolean
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- def last[TExpression](fieldName: String, expression: TExpression): BsonField
Gets a field name for a
$group
operation representing the value of the given expression when applied to the last member of the group.Gets a field name for a
$group
operation representing the value of the given expression when applied to the last member of the group.- TExpression
the expression type
- fieldName
the field name
- expression
the expression
- returns
the field
- See also
- def max[TExpression](fieldName: String, expression: TExpression): BsonField
Gets a field name for a
$group
operation representing the maximum of the values of the given expression when applied to all members of the group.Gets a field name for a
$group
operation representing the maximum of the values of the given expression when applied to all members of the group.- TExpression
the expression type
- fieldName
the field name
- expression
the expression
- returns
the field
- See also
- def min[TExpression](fieldName: String, expression: TExpression): BsonField
Gets a field name for a
$group
operation representing the minimum of the values of the given expression when applied to all members of the group.Gets a field name for a
$group
operation representing the minimum of the values of the given expression when applied to all members of the group.- TExpression
the expression type
- fieldName
the field name
- expression
the expression
- returns
the field
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- final def ne(arg0: AnyRef): Boolean
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- final def notify(): Unit
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- def push[TExpression](fieldName: String, expression: TExpression): BsonField
Gets a field name for a
$group
operation representing an array of all values that results from applying an expression to each document in a group of documents that share the same group by key.Gets a field name for a
$group
operation representing an array of all values that results from applying an expression to each document in a group of documents that share the same group by key.- TExpression
the expression type
- fieldName
the field name
- expression
the expression
- returns
the field
- See also
- def stdDevPop[TExpression](fieldName: String, expression: TExpression): BsonField
Gets a field name for a
$group
operation representing the sample standard deviation of the values of the given expression when applied to all members of the group.Gets a field name for a
$group
operation representing the sample standard deviation of the values of the given expression when applied to all members of the group.Use if the values encompass the entire population of data you want to represent and do not wish to generalize about a larger population.
- TExpression
the expression type
- fieldName
the field name
- expression
the expression
- returns
the field
- Since
1.1
- Note
Requires MongoDB 3.2 or greater
- See also
- def stdDevSamp[TExpression](fieldName: String, expression: TExpression): BsonField
Gets a field name for a
$group
operation representing the sample standard deviation of the values of the given expression when applied to all members of the group.Gets a field name for a
$group
operation representing the sample standard deviation of the values of the given expression when applied to all members of the group.Use if the values encompass a sample of a population of data from which to generalize about the population.
- TExpression
the expression type
- fieldName
the field name
- expression
the expression
- returns
the field
- Since
1.1
- Note
Requires MongoDB 3.2 or greater
- See also
- def sum[TExpression](fieldName: String, expression: TExpression): BsonField
Gets a field name for a
$group
operation representing the sum of the values of the given expression when applied to all members of the group.Gets a field name for a
$group
operation representing the sum of the values of the given expression when applied to all members of the group.- TExpression
the expression type
- fieldName
the field name
- expression
the expression
- returns
the field
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- final def synchronized[T0](arg0: => T0): T0
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(Since version ) see corresponding Javadoc for more information.
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