Granularity class
Granularity for BucketAuto
Granularity ensures that the boundaries of all buckets adhere to a specified
preferred number series. Using a preferred number series provides more
control on where the bucket boundaries are set among the range of values in
the groupBy
expression. They may also be used to help logarithmically and
evenly set bucket boundaries when the range of the groupBy
expression
scales exponentially.
Renard Series
The Renard number series are sets of numbers derived by taking either the 5th, 10 th, 20 th, 40 th, or 80 th root of 10, then including various powers of the root that equate to values between 1.0 to 10.0 (10.3 in the case of R80).
Set granularity to R5, R10, R20, R40, or R80 to restrict bucket boundaries to values in the series. The values of the series are multiplied by a power of 10 when the groupBy values are outside of the 1.0 to 10.0 (10.3 for R80) range.
Example:
The R5 series is based off of the fifth root of 10, which is 1.58, and includes various powers of this root (rounded) until 10 is reached. The R5 series is derived as follows:
 10 0/5 = 1
 10 1/5 = 1.584 ~ 1.6
 10 2/5 = 2.511 ~ 2.5
 10 3/5 = 3.981 ~ 4.0
 10 4/5 = 6.309 ~ 6.3
 10 5/5 = 10
The same approach is applied to the other Renard series to offer finer granularity, i.e., more intervals between 1.0 and 10.0 (10.3 for R80).
E Series
The E number series are similar to the Renard series in that they subdivide the interval from 1.0 to 10.0 by the 6 th, 12 th, 24 th, 48 th, 96 th, or 192 nd root of ten with a particular relative error.
Set granularity to E6, E12, E24, E48, E96, or E192 to restrict bucket boundaries to values in the series. The values of the series are multiplied by a power of 10 when the groupBy values are outside of the 1.0 to 10.0 range. To learn more about the Eseries and their respective relative errors, see preferred number series.
125 Series
The 125 series behaves like a threevalue Renard series, if such a series existed.
Set granularity to 125 to restrict bucket boundaries to various powers of the third root of 10, rounded to one significant digit.
Example:
The following values are part of the 125 series: 0.1, 0.2, 0.5, 1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, and so on…
Powers of Two Series
Set granularity to POWERSOF2 to restrict bucket boundaries to numbers that are a power of two.
Example:
The following numbers adhere to the power of two Series:
 2^0 = 1
 2^1 = 2
 2^2 = 4
 2^3 = 8
 2^4 = 16
 2^5 = 32
 and so on…
A common implementation is how various computer components, like memory, often adhere to the POWERSOF2 set of preferred numbers:
1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, and so on….
https://docs.mongodb.com/manual/reference/operator/aggregation/bucketAuto/#granularity
 Inheritance
 Object
 AggregationExpr
 Const
 Granularity
Properties
 hashCode → int

The hash code for this object. [...]
readonly, inherited
 runtimeType → Type

A representation of the runtime type of the object.
readonly, inherited
Methods

build(
) → dynamic 
inherited

noSuchMethod(
Invocation invocation ) → dynamic 
Invoked when a nonexistent method or property is accessed. [...]
inherited

toString(
) → String 
Returns a string representation of this object.
inherited
Operators

operator ==(
Object other ) → bool 
The equality operator. [...]
inherited
Static Properties
 e6 → Granularity

final
 e12 → Granularity

final
 e24 → Granularity

final
 e48 → Granularity

final
 e96 → Granularity

final
 e192 → Granularity

final
 g125 → Granularity

final
 powersof2 → Granularity

final
 r5 → Granularity

final
 r10 → Granularity

final
 r20 → Granularity

final
 r40 → Granularity

final
 r80 → Granularity

final