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org.apache.spark.sql.internal.connector

SupportsPushDownCatalystFilters

trait SupportsPushDownCatalystFilters extends AnyRef

A mix-in interface for FileScanBuilder. File sources can implement this interface to push down filters to the file source. The pushed down filters will be separated into partition filters and data filters. Partition filters are used for partition pruning and data filters are used to reduce the size of the data to be read.

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  1. abstract def pushFilters(filters: Seq[Expression]): Seq[Expression]

    Pushes down catalyst Expression filters (which will be separated into partition filters and data filters), and returns data filters that need to be evaluated after scanning.

  2. abstract def pushedFilters: Array[Predicate]

    Returns the data filters that are pushed to the data source via #pushFilters(Seq[Expression]).

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