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  • package molecule
    Definition Classes
    root
  • package boilerplate
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  • package api
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    boilerplate
  • trait KeywordsStable extends AnyRef

    Keywords to mark aggregate expressions on and unifications of attributes.

    Keywords to mark aggregate expressions on and unifications of attributes.

    // Aggregates on any attribute type
Person.age(count).get.map(_.head ==> 3)         // count of asserted `age` attribute values
Person.age(countDistinct).get.map(_.head ==> 3) // count of asserted distinct `age` attribute values
Person.age(max).get.map(_.head ==> 38)          // maximum `age` value (using `compare`)
Person.age(min).get.map(_.head ==> 5)           // maximum `age` value (using `compare`)
Person.age(rand).get.map(_.head ==> 25)         // single random `age` value
Person.age(sample).get.map(_.head ==> 27)       // single sample `age` value (when single value, same as random)

// Aggregates on any attribute type, returning multiple values
Person.age(distinct).get.map(_.head ==> Vector(5, 7, 38)) // distinct `age` values
Person.age(max(2)).get.map(_.head ==> Vector(38, 7))      // 2 maximum `age` values
Person.age(min(2)).get.map(_.head ==> Vector(5, 7))       // 2 minimum `age` values
Person.age(rand(2)).get.map(_.head ==> Stream(5, ?))      // 2 random `age` values (values can re-occur)
Person.age(sample(2)).get.map(_.head ==> Vector(7, 38))   // 2 sample `age` values

// Aggregates on number attributes
Person.age(sum).get.map(_.head ==> 50)                  // sum of all `age` numbers
Person.age(avg).get.map(_.head ==> 16.66666667)         // average of all `age` numbers
Person.age(median).get.map(_.head ==> 7)                // median of all `age` numbers
Person.age(stddev).get.map(_.head ==> 15.107025591499)  // standard deviation of all `age` numbers
Person.age(variance).get.map(_.head ==> 228.2222222222) // variance of all `age` numbers
    Definition Classes
    api
  • AggrCoalesce
  • AggrInt
  • AggrKw
  • Kw
  • avg
  • bi
  • count
  • countDistinct
  • distinct
  • max
  • maxs
  • median
  • min
  • mins
  • rand
  • rands
  • sample
  • samples
  • stddev
  • sum
  • unify
  • v1
  • variance

trait sample extends AggrKw

Sample attribute value(s).

Apply sample keyword to attribute to return a single sample (random) attribute value of entities matching the molecule.

for {
  _ <- Person.age.insert(25, 34, 37, 42, 70)
  _ <- Person.age(sample).get.map(_.head ==> 42) // or other..
} yield ()

Apply sample(n) to return Vector of up to n distinct sample values.

Person.age(sample(3)).get.map(_.head ==> Vector(70, 25, 37)) // or other..

If values don't need to be distinct, random(n) can be used also.

Source
Keywords.scala
Note

Can at most return the number of values that match.

Linear Supertypes
AggrKw, Kw, AnyRef, Any
Known Subclasses
sample
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  1. final def !=(arg0: Any): Boolean
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  2. final def ##(): Int
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  3. final def ==(arg0: Any): Boolean
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  4. def apply(n: Int): samples

    Distinct sample values of attribute.

    Distinct sample values of attribute.

    Apply sample(n) to an attribute to return a Vector of up to n distinct sample values (can at most return the number of values that match).

    for {
  _ <- Person.age.insert(25, 34, 37, 42, 70)
  _ <- Person.age(sample(3)).get.map(_.head ==> Vector(42, 25, 42)) // or other..
} yield ()

    If values don't need to be distinct, random(n) can be used also.

    returns

    List[attribute-type]

    Note

    Can at most return the number of values that match.

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  6. def clone(): AnyRef
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  1. def finalize(): Unit
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    Deprecated

Inherited from AggrKw

Inherited from Kw

Inherited from AnyRef

Inherited from Any

Aggregate keywords

Keywords applied to attributes that return aggregated value(s).

Ungrouped