Packages

abstract class HashMapGenerator extends AnyRef

This is a helper class to generate an append-only row-based hash map that can act as a 'cache' for extremely fast key-value lookups while evaluating aggregates (and fall back to the BytesToBytesMap if a given key isn't found). This is 'codegened' in HashAggregate to speed up aggregates w/ key.

NOTE: the generated hash map currently doesn't support nullable keys and falls back to the BytesToBytesMap to store them.

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AnyRef, Any
Known Subclasses
RowBasedHashMapGenerator, VectorizedHashMapGenerator
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Instance Constructors

  1. new HashMapGenerator(ctx: CodegenContext, aggregateExpressions: Seq[AggregateExpression], generatedClassName: String, groupingKeySchema: StructType, bufferSchema: StructType)

Type Members

  1. case class Buffer(dataType: DataType, name: String) extends Product with Serializable

Abstract Value Members

  1. abstract def generateEquals(): String

    Generates a method that returns true if the group-by keys exist at a given index.

    Generates a method that returns true if the group-by keys exist at a given index.

    Attributes
    protected
  2. abstract def generateFindOrInsert(): String

    Generates a method that returns a row which keeps track of the aggregate value(s) for a given set of keys.

    Generates a method that returns a row which keeps track of the aggregate value(s) for a given set of keys. If the corresponding row doesn't exist, the generated method adds the corresponding row in the associated key value batch.

    Attributes
    protected
  3. abstract def generateRowIterator(): String
    Attributes
    protected
  4. abstract def initializeAggregateHashMap(): String
    Attributes
    protected

Concrete Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
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  2. final def ##(): Int
    Definition Classes
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  3. final def ==(arg0: Any): Boolean
    Definition Classes
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  4. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  5. val buffVars: Seq[ExprCode]
  6. val bufferValues: Seq[Buffer]
  7. def clone(): AnyRef
    Attributes
    protected[lang]
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    Annotations
    @throws( ... ) @native()
  8. final def eq(arg0: AnyRef): Boolean
    Definition Classes
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  9. def equals(arg0: Any): Boolean
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  10. def finalize(): Unit
    Attributes
    protected[lang]
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    Annotations
    @throws( classOf[java.lang.Throwable] )
  11. final def genComputeHash(ctx: CodegenContext, input: String, dataType: DataType, result: String): String
    Attributes
    protected
  12. def generate(): String
  13. final def generateClose(): String
    Attributes
    protected
  14. final def generateHashFunction(): String

    Generates a method that computes a hash by currently xor-ing all individual group-by keys.

    Generates a method that computes a hash by currently xor-ing all individual group-by keys. For instance, if we have 2 long group-by keys, the generated function would be of the form:

    private long hash(long agg_key, long agg_key1) {
  return agg_key ^ agg_key1;
  }
    Attributes
    protected
  15. final def getClass(): Class[_]
    Definition Classes
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    Annotations
    @native()
  16. val groupingKeySignature: String
  17. val groupingKeys: Seq[Buffer]
  18. def hashCode(): Int
    Definition Classes
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    Annotations
    @native()
  19. final def isInstanceOf[T0]: Boolean
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  20. final def ne(arg0: AnyRef): Boolean
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  21. final def notify(): Unit
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    @native()
  22. final def notifyAll(): Unit
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    @native()
  23. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
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  24. def toString(): String
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  25. final def wait(): Unit
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    @throws( ... )
  26. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
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    @throws( ... )
  27. final def wait(arg0: Long): Unit
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    @throws( ... ) @native()

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