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c

org.apache.spark.sql.execution.aggregate

RowBasedHashMapGenerator

class RowBasedHashMapGenerator extends HashMapGenerator

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.

We also have VectorizedHashMapGenerator, which generates a append-only vectorized hash map. We choose one of the two as the 1st level, fast hash map during aggregation.

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

Linear Supertypes
HashMapGenerator, AnyRef, Any
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  1. RowBasedHashMapGenerator
  2. HashMapGenerator
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Instance Constructors

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

Type Members

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

Value Members

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

    Generates a method that returns true if the group-by keys exist at a given index in the associated org.apache.spark.sql.catalyst.expressions.RowBasedKeyValueBatch.

    Generates a method that returns true if the group-by keys exist at a given index in the associated org.apache.spark.sql.catalyst.expressions.RowBasedKeyValueBatch.

    Attributes
    protected
    Definition Classes
    RowBasedHashMapGenerator → HashMapGenerator
  14. def generateFindOrInsert(): String

    Generates a method that returns a org.apache.spark.sql.catalyst.expressions.UnsafeRow which keeps track of the aggregate value(s) for a given set of keys.

    Generates a method that returns a org.apache.spark.sql.catalyst.expressions.UnsafeRow 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 org.apache.spark.sql.catalyst.expressions.RowBasedKeyValueBatch.

    Attributes
    protected
    Definition Classes
    RowBasedHashMapGenerator → HashMapGenerator
  15. 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
    Definition Classes
    HashMapGenerator
  16. def generateRowIterator(): String
    Attributes
    protected
    Definition Classes
    RowBasedHashMapGenerator → HashMapGenerator
  17. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  18. val groupingKeySignature: String
    Definition Classes
    HashMapGenerator
  19. val groupingKeys: Seq[Buffer]
    Definition Classes
    HashMapGenerator
  20. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  21. def initializeAggregateHashMap(): String
    Attributes
    protected
    Definition Classes
    RowBasedHashMapGenerator → HashMapGenerator
  22. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  23. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  24. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  25. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @HotSpotIntrinsicCandidate()
  26. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  27. def toString(): String
    Definition Classes
    AnyRef → Any
  28. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  29. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()
  30. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

Deprecated Value Members

  1. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] ) @Deprecated
    Deprecated

Inherited from HashMapGenerator

Inherited from AnyRef

Inherited from Any

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