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Log in CreatingSetsBlockInputStream always shows join build has empty result #5403

@windtalker

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@windtalker

Bug Report

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1. Minimal reproduce step (Required)

After #3638, log in CreatingSetsBlockInputStream always shows "join build has empty result", even if the join build does have input rows, taking the following log as an example:

[2022/07/19 10:50:17.323 +08:00] [DEBUG] [CreatingSetsBlockInputStream.cpp:284] ["CreatingSets:MPP<query:434686921824796673,task:7> Subquery has empty result."] [thread_id=2548]
[2022/07/19 10:50:17.323 +08:00] [DEBUG] [CreatingSetsBlockInputStream.cpp:156] ["CreatingSets:MPP<query:434686921824796673,task:7> Creating all tasks takes 5.199640496 sec. "] [thread_id=2421]

2. What did you expect to see? (Required)

3. What did you see instead (Required)

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