Packages

t

org.apache.spark.sql.delta.perf

OptimizeMetadataOnlyDeltaQuery

trait OptimizeMetadataOnlyDeltaQuery extends Logging

Optimize COUNT, MIN and MAX expressions on Delta tables. This optimization is only applied when the following conditions are met: - The MIN/MAX columns are not nested and data type is supported by the optimization (ByteType, ShortType, IntegerType, LongType, FloatType, DoubleType, DateType). - All AddFiles in the Delta Log must have stats on columns used in MIN/MAX expressions, or the columns must be partitioned, in the latter case it uses partitionValues, a required field. - Table has no deletion vectors, or query has no MIN/MAX expressions. - COUNT has no DISTINCT. - Query has no filters. - Query has no GROUP BY. Example of valid query: SELECT COUNT(*), MIN(id), MAX(partition_col) FROM MyDeltaTable

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Logging, AnyRef, Any
Known Subclasses
PrepareDeltaScan, PrepareDeltaScanBase
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  1. OptimizeMetadataOnlyDeltaQuery
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Type Members

  1. case class DeltaColumnStat(min: Any, max: Any) extends Product with Serializable

    Min and max values from Delta Log stats or partitionValues.

Abstract Value Members

  1. abstract def getDeltaScanGenerator(index: TahoeLogFileIndex): DeltaScanGenerator
    Attributes
    protected

Concrete Value Members

  1. final def !=(arg0: Any): Boolean
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  2. final def ##: Int
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  3. final def ==(arg0: Any): Boolean
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  5. def clone(): AnyRef
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  8. def finalize(): Unit
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  9. final def getClass(): Class[_ <: AnyRef]
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  10. def hashCode(): Int
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  11. def initializeLogIfNecessary(isInterpreter: Boolean, silent: Boolean): Boolean
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    Logging
  12. def initializeLogIfNecessary(isInterpreter: Boolean): Unit
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  13. final def isInstanceOf[T0]: Boolean
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  14. def isTraceEnabled(): Boolean
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  15. def log: Logger
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  16. def logDebug(msg: => String, throwable: Throwable): Unit
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  17. def logDebug(msg: => String): Unit
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  18. def logError(msg: => String, throwable: Throwable): Unit
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  19. def logError(msg: => String): Unit
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  20. def logInfo(msg: => String, throwable: Throwable): Unit
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  21. def logInfo(msg: => String): Unit
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  22. def logName: String
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  23. def logTrace(msg: => String, throwable: Throwable): Unit
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  24. def logTrace(msg: => String): Unit
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  25. def logWarning(msg: => String, throwable: Throwable): Unit
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  26. def logWarning(msg: => String): Unit
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  27. final def ne(arg0: AnyRef): Boolean
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  28. final def notify(): Unit
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    @native()
  29. final def notifyAll(): Unit
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    @native()
  30. def optimizeQueryWithMetadata(plan: LogicalPlan): LogicalPlan
  31. final def synchronized[T0](arg0: => T0): T0
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  32. def toString(): String
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  33. final def wait(): Unit
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  34. final def wait(arg0: Long, arg1: Int): Unit
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  35. final def wait(arg0: Long): Unit
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    @throws(classOf[java.lang.InterruptedException]) @native()
  36. object MetadataOptimizableAggregate

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