Packages

object TimeWindowing extends Rule[LogicalPlan]

Maps a time column to multiple time windows using the Expand operator. Since it's non-trivial to figure out how many windows a time column can map to, we over-estimate the number of windows and filter out the rows where the time column is not inside the time window.

Linear Supertypes
Rule[LogicalPlan], Logging, SQLConfHelper, AnyRef, Any
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  1. TimeWindowing
  2. Rule
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Type Members

  1. implicit class LogStringContext extends AnyRef
    Definition Classes
    Logging

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. def apply(plan: LogicalPlan): LogicalPlan

    Generates the logical plan for generating window ranges on a timestamp column.

    Generates the logical plan for generating window ranges on a timestamp column. Without knowing what the timestamp value is, it's non-trivial to figure out deterministically how many window ranges a timestamp will map to given all possible combinations of a window duration, slide duration and start time (offset). Therefore, we express and over-estimate the number of windows there may be, and filter the valid windows. We use last Project operator to group the window columns into a struct so they can be accessed as window.start and window.end.

    The windows are calculated as below: maxNumOverlapping <- ceil(windowDuration / slideDuration) for (i <- 0 until maxNumOverlapping) remainder <- (timestamp - startTime) % slideDuration lastStart <- timestamp - ((remainder < 0) ? remainder + slideDuration : remainder) windowStart <- lastStart - i * slideDuration windowEnd <- windowStart + windowDuration return windowStart, windowEnd

    This behaves as follows for the given parameters for the time: 12:05. The valid windows are marked with a +, and invalid ones are marked with a x. The invalid ones are filtered using the Filter operator. window: 12m, slide: 5m, start: 0m :: window: 12m, slide: 5m, start: 2m 11:55 - 12:07 + 11:52 - 12:04 x 12:00 - 12:12 + 11:57 - 12:09 + 12:05 - 12:17 + 12:02 - 12:14 +

    plan

    The logical plan

    returns

    the logical plan that will generate the time windows using the Expand operator, with the Filter operator for correctness and Project for usability.

    Definition Classes
    TimeWindowing → Rule
  5. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  6. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.CloneNotSupportedException]) @IntrinsicCandidate() @native()
  7. def conf: SQLConf

    The active config object within the current scope.

    The active config object within the current scope. See SQLConf.get for more information.

    Definition Classes
    SQLConfHelper
  8. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  9. def equals(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef → Any
  10. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
    AnyRef → Any
    Annotations
    @IntrinsicCandidate() @native()
  11. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @IntrinsicCandidate() @native()
  12. def initializeLogIfNecessary(isInterpreter: Boolean, silent: Boolean): Boolean
    Attributes
    protected
    Definition Classes
    Logging
  13. def initializeLogIfNecessary(isInterpreter: Boolean): Unit
    Attributes
    protected
    Definition Classes
    Logging
  14. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  15. def isTraceEnabled(): Boolean
    Attributes
    protected
    Definition Classes
    Logging
  16. def log: Logger
    Attributes
    protected
    Definition Classes
    Logging
  17. def logDebug(msg: => String, throwable: Throwable): Unit
    Attributes
    protected
    Definition Classes
    Logging
  18. def logDebug(entry: LogEntry, throwable: Throwable): Unit
    Attributes
    protected
    Definition Classes
    Logging
  19. def logDebug(entry: LogEntry): Unit
    Attributes
    protected
    Definition Classes
    Logging
  20. def logDebug(msg: => String): Unit
    Attributes
    protected
    Definition Classes
    Logging
  21. def logError(msg: => String, throwable: Throwable): Unit
    Attributes
    protected
    Definition Classes
    Logging
  22. def logError(entry: LogEntry, throwable: Throwable): Unit
    Attributes
    protected
    Definition Classes
    Logging
  23. def logError(entry: LogEntry): Unit
    Attributes
    protected
    Definition Classes
    Logging
  24. def logError(msg: => String): Unit
    Attributes
    protected
    Definition Classes
    Logging
  25. def logInfo(msg: => String, throwable: Throwable): Unit
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    protected
    Definition Classes
    Logging
  26. def logInfo(entry: LogEntry, throwable: Throwable): Unit
    Attributes
    protected
    Definition Classes
    Logging
  27. def logInfo(entry: LogEntry): Unit
    Attributes
    protected
    Definition Classes
    Logging
  28. def logInfo(msg: => String): Unit
    Attributes
    protected
    Definition Classes
    Logging
  29. def logName: String
    Attributes
    protected
    Definition Classes
    Logging
  30. def logTrace(msg: => String, throwable: Throwable): Unit
    Attributes
    protected
    Definition Classes
    Logging
  31. def logTrace(entry: LogEntry, throwable: Throwable): Unit
    Attributes
    protected
    Definition Classes
    Logging
  32. def logTrace(entry: LogEntry): Unit
    Attributes
    protected
    Definition Classes
    Logging
  33. def logTrace(msg: => String): Unit
    Attributes
    protected
    Definition Classes
    Logging
  34. def logWarning(msg: => String, throwable: Throwable): Unit
    Attributes
    protected
    Definition Classes
    Logging
  35. def logWarning(entry: LogEntry, throwable: Throwable): Unit
    Attributes
    protected
    Definition Classes
    Logging
  36. def logWarning(entry: LogEntry): Unit
    Attributes
    protected
    Definition Classes
    Logging
  37. def logWarning(msg: => String): Unit
    Attributes
    protected
    Definition Classes
    Logging
  38. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  39. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @IntrinsicCandidate() @native()
  40. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @IntrinsicCandidate() @native()
  41. lazy val ruleId: RuleId
    Attributes
    protected
    Definition Classes
    Rule
  42. val ruleName: String

    Name for this rule, automatically inferred based on class name.

    Name for this rule, automatically inferred based on class name.

    Definition Classes
    Rule
  43. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  44. def toString(): String
    Definition Classes
    AnyRef → Any
  45. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  46. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()
  47. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  48. def withLogContext(context: Map[String, String])(body: => Unit): Unit
    Attributes
    protected
    Definition Classes
    Logging
  49. def withSQLConf[T](pairs: (String, String)*)(f: => T): T

    Sets all SQL configurations specified in pairs, calls f, and then restores all SQL configurations.

    Sets all SQL configurations specified in pairs, calls f, and then restores all SQL configurations.

    Attributes
    protected
    Definition Classes
    SQLConfHelper

Deprecated Value Members

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

    (Since version 9)

Inherited from Rule[LogicalPlan]

Inherited from Logging

Inherited from SQLConfHelper

Inherited from AnyRef

Inherited from Any

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