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Rationale for this change
DO NOT MERGE. This draft tests one behavior: a test driver drains both input partitions behind a DataFusion
StageBoundarywhile Ballista's shuffle writer waits. Once both partitions report ready, the test releases the boundary and checks that the shuffle files contain the original batches.The plan runs through Ballista's default query-stage executor. The test calls
prime,is_ready, andrelease; Ballista's scheduler is unchanged. Related to DataFusion's AQE discussion.