WeichenXu123 commented on issue #24851: [SPARK-27303][GRAPH] Add Spark Graph API URL: https://github.com/apache/spark/pull/24851#issuecomment-536169402 @s1ck About the sealed trait, what about adding the possible interface into it and mark it sealed ? and non implemented method could throw unsupported operation exception. like ``` sealed trait CypherResult { def df: DataFrame def graph: Graph // throw unsupported operation exception for now. } ```
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