hstream-sql: code clean up

[alissa-tung]

PR Description

Type of change

• Bug fix
• New feature
• Breaking change
• Documentation updates required

Summary of the change and which issue is fixed

Main changes: TODO

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Checklist

• I have run format.sh under script
• I have commented my code, particularly in hard-to-understand areas
• New and existing unit tests pass locally with my changes

[alissa-tung]

I had already detected some bugs and some point to fix or inspect, let me push them further...

[alissa-tung]

left a undefined here cc @Commelina 690e594

[4eUeP]

Why turn off these warnings(e.g., name-shadowing) at the package level? Prefer to turn it off at the module level if you really want.

[Commelina]

left a undefined here cc @Commelina 690e594

Yes, it is acceptable. BTW, this type (window in tableref and group) is very delicate and misleading, and it will be refactored in the next version.
Also, I noticed that binaryAggOpOnValue has been set to undefined for a long time...

[Commelina]

Would you like to merge it now, or do you have more code to commit...? @alissa-tung

[alissa-tung]

i think there will not be more commits

Would you like to merge it now, or do you have more code to commit...? @alissa-tung

[Commelina]

i think there will not be more commits

Would you like to merge it now, or do you have more code to commit...? @alissa-tung

OK. It can be merged after passing checks.