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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 val SQL_CONF_UNBLOCK_ALL: String("allowSourceColumnRenameAndDrop")
5.  final val SQL_CONF_UNBLOCK_DROP: String("allowSourceColumnDrop")
6.  final val SQL_CONF_UNBLOCK_RENAME: String("allowSourceColumnRename")
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11.  def finalize(): Unit

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12.  def getCheckpointHash(path: String): Int
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18.  final def notifyAll(): Unit

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21.  def validateIfSchemaChangeCanBeUnblockedWithSQLConf(spark: SparkSession, metadataPath: String, currentSchema: PersistedMetadata, previousSchema: PersistedMetadata): Unit

    Given a non-additive operation type from a previous schema evolution, check we can process using the new schema given any SQL conf users have explicitly set to unblock.

    Given a non-additive operation type from a previous schema evolution, check we can process using the new schema given any SQL conf users have explicitly set to unblock. The SQL conf can take one of following formats: 1. spark.databricks.delta.streaming.allowSourceColumnRenameAndDrop = true -> allows all non-additive schema changes to propagate. 2. spark.databricks.delta.streaming.allowSourceColumnRenameAndDrop.$checkpointHash = true -> allows all non-additive schema changes to propagate for this particular stream 3. spark.databricks.delta.streaming.allowSourceColumnRenameAndDrop.$checkpointHash = $deltaVersion

    The allowSourceColumnRenameAndDrop can be replaced with: 1. allowSourceColumnRename to just allow column rename 2. allowSourceColumnDrop to just allow column drops

    We will check for any of these configs given the non-additive operation, and throw a proper error message to instruct the user to set the SQL conf if they would like to unblock.

    metadataPath

    The path to the source-unique metadata location under checkpoint

    currentSchema

    The current persisted schema

    previousSchema

    The previous persisted schema

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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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