Packages

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
Ordering
  1. Alphabetic
  2. By Inheritance
Inherited
  1. RowBasedHashMapGenerator
  2. HashMapGenerator
  3. AnyRef
  4. Any
  1. Hide All
  2. Show All
Visibility
  1. Public
  2. Protected

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(classOf[java.lang.CloneNotSupportedException]) @native()
  8. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  9. def equals(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef → Any
  10. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.Throwable])
  11. final def genComputeHash(ctx: CodegenContext, input: String, dataType: DataType, result: String): String
    Attributes
    protected
    Definition Classes
    HashMapGenerator
  12. def generate(): String
    Definition Classes
    HashMapGenerator
  13. final def generateClose(): String
    Attributes
    protected
    Definition Classes
    HashMapGenerator
  14. 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
  15. 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
  16. 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
  17. def generateRowIterator(): String
    Attributes
    protected
    Definition Classes
    RowBasedHashMapGenerator → HashMapGenerator
  18. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  19. val groupingKeySignature: String
    Definition Classes
    HashMapGenerator
  20. val groupingKeys: Seq[Buffer]
    Definition Classes
    HashMapGenerator
  21. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  22. def initializeAggregateHashMap(): String
    Attributes
    protected
    Definition Classes
    RowBasedHashMapGenerator → HashMapGenerator
  23. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  24. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  25. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  26. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  27. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  28. def toString(): String
    Definition Classes
    AnyRef → Any
  29. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  30. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  31. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()

Inherited from HashMapGenerator

Inherited from AnyRef

Inherited from Any

Ungrouped