org.apache.spark.sql.sources

BaseRelation

abstract class BaseRelation extends AnyRef

::DeveloperApi:: Represents a collection of tuples with a known schema. Classes that extend BaseRelation must be able to produce the schema of their data in the form of a StructType Concrete implementation should inherit from one of the descendant Scan classes, which define various abstract methods for execution.

BaseRelations must also define a equality function that only returns true when the two instances will return the same data. This equality function is used when determining when it is safe to substitute cached results for a given relation.

Annotations
@DeveloperApi()
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AnyRef, Any
Known Subclasses
CatalystScan, ParquetRelation2, PrunedFilteredScan, PrunedScan, TableScan
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Instance Constructors

  1. new BaseRelation()

Abstract Value Members

  1. abstract def schema: StructType

  2. abstract def sqlContext: SQLContext

Concrete Value Members

  1. final def !=(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef

  2. final def !=(arg0: Any): Boolean

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  3. final def ##(): Int

    Definition Classes
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  4. final def ==(arg0: AnyRef): Boolean

    Definition Classes
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  5. final def ==(arg0: Any): Boolean

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  6. final def asInstanceOf[T0]: T0

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  7. def clone(): AnyRef

    Attributes
    protected[java.lang]
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    @throws( ... )

  8. final def eq(arg0: AnyRef): Boolean

    Definition Classes
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  9. def equals(arg0: Any): Boolean

    Definition Classes
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  10. def finalize(): Unit

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    protected[java.lang]
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    @throws( classOf[java.lang.Throwable] )

  11. final def getClass(): Class[_]

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  12. def hashCode(): Int

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  13. final def isInstanceOf[T0]: Boolean

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  14. final def ne(arg0: AnyRef): Boolean

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  15. final def notify(): Unit

    Definition Classes
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  16. final def notifyAll(): Unit

    Definition Classes
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  17. def sizeInBytes: Long

    Returns an estimated size of this relation in bytes.

    Returns an estimated size of this relation in bytes. This information is used by the planner to decided when it is safe to broadcast a relation and can be overridden by sources that know the size ahead of time. By default, the system will assume that tables are too large to broadcast. This method will be called multiple times during query planning and thus should not perform expensive operations for each invocation.

  18. final def synchronized[T0](arg0: ⇒ T0): T0

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  19. def toString(): String

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  20. final def wait(): Unit

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    @throws( ... )

  21. final def wait(arg0: Long, arg1: Int): Unit

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    @throws( ... )

  22. final def wait(arg0: Long): Unit

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