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  • package molecule
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  • 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(sample).get.map(_.head ==> 27)       // single sample `age` value

// 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(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
  • count
  • countDistinct
  • distinct
  • max
  • maxs
  • median
  • min
  • mins
  • sample
  • samples
  • stddev
  • sum
  • variance

trait max extends AggrKw

Maximum attribute value(s).

Apply max keyword to attribute to return the maximum attribute value of entities matching the molecule.

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

Apply max(n) to return Vector of the n biggest values.

Person.age(max(3)).get.map(_.head ==> Vector(37, 42, 70))
Source
Keywords.scala
Note

max/max(n) supports all value types (via comparators).
max(n) Can at most return the number of values that match.

Linear Supertypes
AggrKw, Kw, AnyRef, Any
Known Subclasses
max
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  3. final def ==(arg0: Any): Boolean
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  4. def apply(i: Int): maxs

    Maximum n values of attribute.

    Maximum n values of attribute.

    Apply max(n) to attribute to return Vector of the n biggest values of entities matching the molecule.

    for {
  _ <- Person.age.insert(25, 34, 37, 42, 70)
  _ <- Person.age(max(3)).get.map(_.head ==> List(37, 42, 70))
} yield ()
    returns

    List[attribute-type]

    Note

    max/max(n) supports all value types (via comparators).
    Can at most return the number of values that match.

  5. final def asInstanceOf[T0]: T0
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  6. def clone(): AnyRef
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Inherited from AggrKw

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