Packages

trait Relation extends AnyRef

A relation in a catalog: either a Table or a View. This is the common type returned by RelationCatalog#loadRelation so a catalog that exposes both kinds can answer a single read in one round trip; callers discriminate with instanceof Table / instanceof View.

The two kinds are deliberately asymmetric, mirroring how Spark treats them: a Table is an object Spark reads from and writes to, while a View carries only metadata (Spark expands its query text at read time and never builds a view object). Modeling both as siblings of Relation -- rather than smuggling a view through the Table surface -- keeps table-only concepts (partitioning, constraints, scans, writes) off the view side.

In practice the only two kinds are Table and View. Relation is left un-sealed because Table is itself an open interface (so a closed hierarchy would add little) and because a sealed Java interface trips Scala's pattern-match analysis.

Annotations
@Evolving()
Source
Relation.java
Since

4.2.0

Linear Supertypes
AnyRef, Any
Known Subclasses
DelegatingTable, StagedTable, SupportsAtomicPartitionManagement, SupportsDelete, SupportsDeleteV2, SupportsMetadataColumns, SupportsPartitionManagement, SupportsRead, SupportsRowLevelOperations, SupportsSchemaEvolution, SupportsWrite, Table, TruncatableTable, View, SupportsIndex
Ordering
  1. Alphabetic
  2. By Inheritance
Inherited
  1. Relation
  2. AnyRef
  3. Any
  1. Hide All
  2. Show All
Visibility
  1. Public
  2. Protected

Abstract Value Members

  1. abstract def columns(): Array[Column]

    The columns of this relation.

  2. abstract def properties(): Map[String, String]

    The string map of properties of this relation.

Concrete Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##: Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  5. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.CloneNotSupportedException]) @IntrinsicCandidate() @native()
  6. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  7. def equals(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef → Any
  8. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
    AnyRef → Any
    Annotations
    @IntrinsicCandidate() @native()
  9. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @IntrinsicCandidate() @native()
  10. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  11. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  12. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @IntrinsicCandidate() @native()
  13. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @IntrinsicCandidate() @native()
  14. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  15. def toString(): String
    Definition Classes
    AnyRef → Any
  16. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  17. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()
  18. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])

Deprecated Value Members

  1. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.Throwable]) @Deprecated
    Deprecated

    (Since version 9)

Inherited from AnyRef

Inherited from Any

Ungrouped