Add tests for filtered SortMergeJoin output size
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Description
Are you planning to add some tests to avoid someone breaking this coalescing behavior?
_Originally posted by @berkaysynnada in https://github.com/apache/datafusion/pull/14160#pullrequestreview-2566386674_
Its needed to prevent the regression and cover SMJ and probably other joins with tests showing that query execution with the join outputs the batches close to `batch_size`
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