THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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3) When a record is matched by RecordEvaluator::isEndOfStream(...), SourceReaderBase stops emitting records from this split and informs SplitFetcherManager to stop reading this split.
4) For SQL users, a new connector option 'scan.record.evaluator.class' is added to provide the custom RecordEvaluator class.
Similar workflow can be made to support this feature for PulsarSource.
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