Eric Marnadi created SPARK-55471:
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             Summary: Adding optimizer support for Sequential Union
                 Key: SPARK-55471
                 URL: https://issues.apache.org/jira/browse/SPARK-55471
             Project: Spark
          Issue Type: Task
          Components: Optimizer, Structured Streaming
    Affects Versions: 4.2.0
            Reporter: Eric Marnadi


We want to allow for nested sequential unions to be flattened and for 
projections to be pushed down to the Sequential Union children. 



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