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1.  final def !=(arg0: Any): Boolean

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2.  final def ##: Int

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3.  final def ==(arg0: Any): Boolean

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4.  final def asInstanceOf[T0]: T0

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5.  def canGetOutputAttrs(p: LogicalPlan): Boolean
6.  def checkIfSameExprIdNotReused(plan: LogicalPlan): Option[String]

   This method checks if reference ExprIds are not reused when assigning a new ExprId.

   This method checks if reference ExprIds are not reused when assigning a new ExprId. For example, it returns false if plan transformers create an alias having the same ExprId with one of reference attributes, e.g., a#1 + 1 AS a#1. Returns the error message if the check does not pass.

7.  def clone(): AnyRef

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   @throws(classOf[java.lang.CloneNotSupportedException]) @native()

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

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9.  def equals(arg0: AnyRef): Boolean

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10.  def finalize(): Unit

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

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    @native()

12.  def hasUniqueExprIdsForOutput(plan: LogicalPlan): Option[String]

    Since some logical plans (e.g., Union) can build AttributeReferences in their output, this method checks if the same ExprId refers to attributes having the same data type in plan output.

    Since some logical plans (e.g., Union) can build AttributeReferences in their output, this method checks if the same ExprId refers to attributes having the same data type in plan output. Returns the error message if the check does not pass.

13.  def hashCode(): Int

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    @native()

14.  final def isInstanceOf[T0]: Boolean

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15.  final def ne(arg0: AnyRef): Boolean

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16.  final def notify(): Unit

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    @native()

17.  final def notifyAll(): Unit

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    @native()

18.  final def synchronized[T0](arg0: => T0): T0

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19.  def toString(): String

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20.  def validateExprIdUniqueness(plan: LogicalPlan): Option[String]

    This method checks if the same ExprId refers to an unique attribute in a plan tree.

    This method checks if the same ExprId refers to an unique attribute in a plan tree. Some plan transformers (e.g., RemoveNoopOperators) rewrite logical plans based on this assumption. Returns the error message if the check does not pass.

21.  def validateOptimizedPlan(previousPlan: LogicalPlan, currentPlan: LogicalPlan): Option[String]

    Validate the structural integrity of an optimized plan.

    Validate the structural integrity of an optimized plan. For example, we can check after the execution of each rule that each plan: - is still resolved - only host special expressions in supported operators - has globally-unique attribute IDs - has the same result schema as the previous plan - has no dangling attribute references

22.  final def wait(): Unit

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    @throws(classOf[java.lang.InterruptedException])

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

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    @throws(classOf[java.lang.InterruptedException])

24.  final def wait(arg0: Long): Unit

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    @throws(classOf[java.lang.InterruptedException]) @native()