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## What changes were proposed in this pull request? Within the same streaming query, when one `StreamingRelation` is referred multiple times – e.g. `df.union(df)` – we should transform it only to one `StreamingExecutionRelation`, instead of two or more different `StreamingExecutionRelation`s (each of which would have a separate set of source, source logs, ...). ## How was this patch tested? Added two test cases, each of which would fail without this patch. Author: Liwei Lin <lwlin7@gmail.com> Closes #17735 from lw-lin/SPARK-20441. |
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