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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 checkIfExprIdsAreGloballyUnique(plan: LogicalPlan): Boolean

   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.

6.  def checkIfSameExprIdNotReused(plan: LogicalPlan): Boolean

   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.

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): Boolean

    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.

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.  final def wait(): Unit

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

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

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

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

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