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  • package spark
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  • package sql
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  • package delta
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  • package stats
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  • trait PrepareDeltaScanBase extends Rule[LogicalPlan] with PredicateHelper with DeltaLogging

    Before query planning, we prepare any scans over delta tables by pushing any projections or filters in allowing us to gather more accurate statistics for CBO and metering.

    Before query planning, we prepare any scans over delta tables by pushing any projections or filters in allowing us to gather more accurate statistics for CBO and metering.

    Note the following - This rule also ensures that all reads from the same delta log use the same snapshot of log thus providing snapshot isolation. - If this rule is invoked within an active OptimisticTransaction, then the scans are generated using the transaction.

    Definition Classes
    stats
  • DeltaTableScan

object DeltaTableScan

This is an extractor object. See https://docs.scala-lang.org/tour/extractor-objects.html.

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  17. def unapply(plan: LogicalPlan): Option[DeltaTableScanType]

    This is an extractor method (basically, the opposite of a constructor) which takes in an object plan and tries to give back the arguments as a DeltaTableScanType.

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