sealed trait StreamWindowing extends AnyRef

Supported stream windowing types, that control how windows are build:

  • based on processing time: current timestamp when rows is processed;
  • based on event time: message creation timestamp. Following Kafka message structure, it always must be column with name 'timestamp'. Column should have LongType or TimestampType or other type with contents that can be converted to a LongType containing unix epoch (in seconds).
  • custom time: arbitrary timestamp column (or expression that evaluates to column) from message defined by user.
Note

When event time or custom time columns are selected for windowing then it is up to user to ensure timestamp correctness in the selected column.

,

this is not an enumeration since custom time type requires user-defined column name.

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AnyRef, Any
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CustomTime, EventTime, ProcessingTime
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  1. abstract val windowBy: String

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