sealed abstract class PreDowngradeTableFeatureCommand extends AnyRef
A base class for implementing a preparation command for removing table features. Must implement a run method. Note, the run method must be implemented in a way that when it finishes, the table does not use the feature that is being removed, and nobody is allowed to start using it again implicitly. One way to achieve this is by disabling the feature on the table before proceeding to the actual removal. See RemovableFeature.preDowngradeCommand.
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abstract
def
removeFeatureTracesIfNeeded(): Boolean
Returns true when it performs a cleaning action.
Returns true when it performs a cleaning action. When no action was required it returns false.
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