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Model Apache Flink's RichFunction.open as an @Initializer method (#862)
From the [docs](https://nightlies.apache.org/flink/flink-docs-master/api/java/org/apache/flink/api/common/functions/RichFunction.html#open-org.apache.flink.api.common.functions.OpenContext-) here: `open(...)` should always be called before other methods, such as `filter(...)`, so it fits our definition of an `@Initializer` method.
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