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https://issues.apache.org/jira/browse/SPARK-22017?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-22017:
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Assignee: Apache Spark
> watermark evaluation with multi-input stream operators is unspecified
> ---------------------------------------------------------------------
>
> Key: SPARK-22017
> URL: https://issues.apache.org/jira/browse/SPARK-22017
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 2.2.0
> Reporter: Jose Torres
> Assignee: Apache Spark
>
> Watermarks are stored as a single value in StreamExecution. If a query has
> multiple watermark nodes (which can generally only happen with multi input
> operators like union), a headOption call will arbitrarily pick one to use as
> the real one. This will happen independently in each batch, possibly leading
> to strange and undefined behavior.
> We should instead choose the minimum from all watermark exec nodes as the
> query-wide watermark.
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