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The java sessionDataset's functions is somehow redundant
Given a column index, the data type is unique, so we should provide users with a single "Get" api instead of apis with type. Besides, getting timestamp can be done without making sure what the column is, and the current logic is false when users gives column names or indexes other than "Time" or 1
Besides, the column index starts form 1 currently, with the first being timestamp. Is this an intentional design?