THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!

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Code Block

language	java

@PublicEvolving
public interface CatalogTable extends CatalogBaseTable {
    /** Return the snapshot specified for the table. Return Optional.empty() if not specified. */
    default Optional<Long> getSnapshot() {
        return Optional.empty();
    }
}

Proposed Changes

Here is the poc of the FLIP: https://github.com/apache/flink/compare/master...hackergin:flink:FLIP-308

I will describe the necessary modifications from several stages of SQL compilation and parsing.

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