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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.  val FILE_NAME_COL: String
5.  val ROW_ID_COL: String
6.  val SOURCE_ROW_PRESENT_COL: String
7.  val TARGET_ROW_PRESENT_COL: String
8.  val TOUCHED_FILES_ACCUM_NAME: String

   Spark UI will track all normal accumulators along with Spark tasks to show them on Web UI.

   Spark UI will track all normal accumulators along with Spark tasks to show them on Web UI. However, the accumulator used by MergeIntoCommand can store a very large value since it tracks all files that need to be rewritten. We should ask Spark UI to not remember it, otherwise, the UI data may consume lots of memory. Hence, we use the prefix internal.metrics. to make this accumulator become an internal accumulator, so that it will not be tracked by Spark UI.

9.  final def asInstanceOf[T0]: T0

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10.  def clone(): AnyRef

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

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12.  def equals(arg0: Any): Boolean

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13.  def finalize(): Unit

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14.  final def getClass(): Class[_]

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15.  def hashCode(): Int

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16.  final def isInstanceOf[T0]: Boolean

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

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18.  final def notify(): Unit

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19.  final def notifyAll(): Unit

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

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21.  def toString(): String

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22.  final def wait(): Unit

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

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

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