JingsongLi commented on issue #8086: [FLINK-12062][table-runtime-blink] Introduce bundle operator to streaming table runtime URL: https://github.com/apache/flink/pull/8086#issuecomment-479374880 Although we can send data in `close`, but we need to pay attention to the relationship with `endInput`. `endInput` is executed before `close`. If the upstream sends data in `close`, the downstream cleans up the state in the previous `endInput`, which will result in incorrect results. (endInput in https://github.com/apache/flink/pull/7959)
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