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object SchemaPruning

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  1. case class RootField(field: StructField, derivedFromAtt: Boolean, prunedIfAnyChildAccessed: Boolean = false) extends Product with Serializable

    This represents a "root" schema field (aka top-level, no-parent).

    This represents a "root" schema field (aka top-level, no-parent). field is the StructField for field name and datatype. derivedFromAtt indicates whether it was derived from an attribute or had a proper child. prunedIfAnyChildAccessed means whether this root field can be pruned if any of child field is used in the query.

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  1. final def !=(arg0: Any): Boolean
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  11. def identifyRootFields(projects: Seq[NamedExpression], filters: Seq[Expression]): Seq[RootField]

    Returns the set of fields from projection and filtering predicates that the query plan needs.

  12. final def isInstanceOf[T0]: Boolean
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  13. final def ne(arg0: AnyRef): Boolean
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  14. final def notify(): Unit
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  15. final def notifyAll(): Unit
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  16. def pruneDataSchema(dataSchema: StructType, requestedRootFields: Seq[RootField]): StructType

    Filters the schema by the requested fields.

    Filters the schema by the requested fields. For example, if the schema is struct<a:int, b:int>, and given requested field are "a", the field "b" is pruned in the returned schema. Note that schema field ordering at original schema is still preserved in pruned schema.

  17. final def synchronized[T0](arg0: ⇒ T0): T0
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  19. final def wait(): Unit
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