case object MaxWatermark extends MultipleWatermarkPolicy with Product with Serializable
Policy to choose the *max* of the operator watermark values as the global watermark value. So the global watermark will advance if any of the individual operator watermarks has advanced. In other words, in a streaming query with multiple input streams and watermarks defined on all of them, the global watermark will advance as fast as the fastest input. So if there is watermark based state cleanup or late-data dropping, then this policy is the most aggressive one and may lead to unexpected behavior if the data of the slow stream is delayed.
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