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org.apache.spark.sql.execution

ReplaceHashWithSortAgg

object ReplaceHashWithSortAgg extends Rule[SparkPlan]

Replace hash-based aggregate with sort aggregate in the spark plan if:

1. The plan is a pair of partial and final HashAggregateExec or ObjectHashAggregateExec, and the child of partial aggregate satisfies the sort order of corresponding SortAggregateExec. or 2. The plan is a HashAggregateExec or ObjectHashAggregateExec, and the child satisfies the sort order of corresponding SortAggregateExec.

Examples: 1. aggregate after join:

HashAggregate(t1.i, SUM, final) | SortAggregate(t1.i, SUM, complete) HashAggregate(t1.i, SUM, partial) => | | SortMergeJoin(t1.i = t2.j) SortMergeJoin(t1.i = t2.j)

2. aggregate after sort:

HashAggregate(t1.i, SUM, partial) SortAggregate(t1.i, SUM, partial) | => | Sort(t1.i) Sort(t1.i)

Hash-based aggregate can be replaced when its child satisfies the sort order of corresponding sort aggregate. Sort aggregate is faster in the sense that it does not have hashing overhead of hash aggregate.

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Rule[SparkPlan], Logging, SQLConfHelper, AnyRef, Any
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  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. def apply(plan: SparkPlan): SparkPlan
    Definition Classes
    ReplaceHashWithSortAgg → Rule
  5. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  6. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
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    @throws( ... ) @native()
  7. def conf: SQLConf
    Definition Classes
    SQLConfHelper
  8. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  9. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  10. def finalize(): Unit
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    protected[lang]
    Definition Classes
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  11. final def getClass(): Class[_]
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  12. def hashCode(): Int
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    @native()
  13. def initializeLogIfNecessary(isInterpreter: Boolean, silent: Boolean): Boolean
    Attributes
    protected
    Definition Classes
    Logging
  14. def initializeLogIfNecessary(isInterpreter: Boolean): Unit
    Attributes
    protected
    Definition Classes
    Logging
  15. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  16. def isTraceEnabled(): Boolean
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    protected
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    Logging
  17. def log: Logger
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    Logging
  18. def logDebug(msg: ⇒ String, throwable: Throwable): Unit
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  19. def logDebug(msg: ⇒ String): Unit
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  20. def logError(msg: ⇒ String, throwable: Throwable): Unit
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  21. def logError(msg: ⇒ String): Unit
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  22. def logInfo(msg: ⇒ String, throwable: Throwable): Unit
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  23. def logInfo(msg: ⇒ String): Unit
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  24. def logName: String
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    Logging
  25. def logTrace(msg: ⇒ String, throwable: Throwable): Unit
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    protected
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    Logging
  26. def logTrace(msg: ⇒ String): Unit
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  27. def logWarning(msg: ⇒ String, throwable: Throwable): Unit
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    Logging
  28. def logWarning(msg: ⇒ String): Unit
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  29. final def ne(arg0: AnyRef): Boolean
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    AnyRef
  30. final def notify(): Unit
    Definition Classes
    AnyRef
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    @native()
  31. final def notifyAll(): Unit
    Definition Classes
    AnyRef
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  32. lazy val ruleId: RuleId
    Attributes
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    Definition Classes
    Rule
  33. val ruleName: String
    Definition Classes
    Rule
  34. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
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  35. def toString(): String
    Definition Classes
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  36. final def wait(): Unit
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  37. final def wait(arg0: Long, arg1: Int): Unit
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  38. final def wait(arg0: Long): Unit
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Inherited from Rule[SparkPlan]

Inherited from Logging

Inherited from SQLConfHelper

Inherited from AnyRef

Inherited from Any

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