Packages

object EliminateView extends Rule[LogicalPlan] with CastSupport

This rule has two goals:

1. Removes View operators from the plan. The operator is respected till the end of analysis stage because we want to see which part of an analyzed logical plan is generated from a view.

2. Make sure that a view's child plan produces the view's output attributes. We try to wrap the child by: 1. Generate the queryOutput by: 1.1. If the query column names are defined, map the column names to attributes in the child output by name(This is mostly for handling view queries like SELECT * FROM ..., the schema of the referenced table/view may change after the view has been created, so we have to save the output of the query to viewQueryColumnNames, and restore them during view resolution, in this way, we are able to get the correct view column ordering and omit the extra columns that we don't require); 1.2. Else set the child output attributes to queryOutput. 2. Map the queryOutput to view output by index, if the corresponding attributes don't match, try to up cast and alias the attribute in queryOutput to the attribute in the view output. 3. Add a Project over the child, with the new output generated by the previous steps.

Once reaches this rule, it means CheckAnalysis did necessary checks on number of columns between the view output and the child output or the query column names. CheckAnalysis also checked the cast from the view's child to the Project is up-cast.

This should be only done after the batch of Resolution, because the view attributes are not completely resolved during the batch of Resolution.

Linear Supertypes
CastSupport, Rule[LogicalPlan], Logging, AnyRef, Any
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Inherited
  1. EliminateView
  2. CastSupport
  3. Rule
  4. Logging
  5. AnyRef
  6. Any
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Visibility
  1. Public
  2. All

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. def apply(plan: LogicalPlan): LogicalPlan
    Definition Classes
    EliminateView → Rule
  5. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  6. def cast(child: Expression, dataType: DataType): Cast

    Create a Cast expression with the session local time zone.

    Create a Cast expression with the session local time zone.

    Definition Classes
    CastSupport
  7. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()
  8. def conf: SQLConf

    Configuration used to create a valid cast expression.

    Configuration used to create a valid cast expression.

    Definition Classes
    EliminateView → CastSupport
  9. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  10. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  11. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  12. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  13. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  14. def initializeLogIfNecessary(isInterpreter: Boolean, silent: Boolean): Boolean
    Attributes
    protected
    Definition Classes
    Logging
  15. def initializeLogIfNecessary(isInterpreter: Boolean): Unit
    Attributes
    protected
    Definition Classes
    Logging
  16. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  17. def isTraceEnabled(): Boolean
    Attributes
    protected
    Definition Classes
    Logging
  18. def log: Logger
    Attributes
    protected
    Definition Classes
    Logging
  19. def logDebug(msg: ⇒ String, throwable: Throwable): Unit
    Attributes
    protected
    Definition Classes
    Logging
  20. def logDebug(msg: ⇒ String): Unit
    Attributes
    protected
    Definition Classes
    Logging
  21. def logError(msg: ⇒ String, throwable: Throwable): Unit
    Attributes
    protected
    Definition Classes
    Logging
  22. def logError(msg: ⇒ String): Unit
    Attributes
    protected
    Definition Classes
    Logging
  23. def logInfo(msg: ⇒ String, throwable: Throwable): Unit
    Attributes
    protected
    Definition Classes
    Logging
  24. def logInfo(msg: ⇒ String): Unit
    Attributes
    protected
    Definition Classes
    Logging
  25. def logName: String
    Attributes
    protected
    Definition Classes
    Logging
  26. def logTrace(msg: ⇒ String, throwable: Throwable): Unit
    Attributes
    protected
    Definition Classes
    Logging
  27. def logTrace(msg: ⇒ String): Unit
    Attributes
    protected
    Definition Classes
    Logging
  28. def logWarning(msg: ⇒ String, throwable: Throwable): Unit
    Attributes
    protected
    Definition Classes
    Logging
  29. def logWarning(msg: ⇒ String): Unit
    Attributes
    protected
    Definition Classes
    Logging
  30. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  31. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  32. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  33. val ruleName: String

    Name for this rule, automatically inferred based on class name.

    Name for this rule, automatically inferred based on class name.

    Definition Classes
    Rule
  34. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  35. def toString(): String
    Definition Classes
    AnyRef → Any
  36. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  37. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  38. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()

Inherited from CastSupport

Inherited from Rule[LogicalPlan]

Inherited from Logging

Inherited from AnyRef

Inherited from Any

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