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2: Convert  SqlTruncateTable to TruncateTableOperation in SqlToOperationConverter, in SqlToOperationConverter 

3: In method TableEnvironmentImpl#executeInternal, if the operation is  instance of TruncateTableOperation,  get the DynamicTableSink  of the table which should implement SupportsTruncate   and then call method SupportsTruncate#truncateTable  directly to truncate the table.

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