Feng Zhu comments

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                                            Feng Zhu

[CALCITE-3513] Unify TableFunction implementor's NullPolicy and its behavior

@vlsi Thanks for review. Actually, I do not have a clear direction for this work now. Let me clarify it and look forward to hearing your advice. At the beginning,...

[CALCITE-3513] Unify TableFunction implementor's NullPolicy and its behavior

@34venu I'm not familiar with sqlline. The best option is to send email to the developers list (https://calcite.apache.org/community/#mailing-lists).

[CALCITE-3216] ClassCastException when running aggregate function and window function over Union

Could you make a conclusion on the topics below? 1) Legal type pairs that is assignable in validation but illegal in runtime. 2) Apart from Union, other SetOps (e.g., Intersect)...

[CALCITE-3216] ClassCastException when running aggregate function and window function over Union

> I have tried use EnumUtils.convert to take a cast for Union's child expression. CompileException was thrown during compiling generated code. It seems EnumUtils.convert can not handle with Enumerator. `EnumUtils.convert`...

[CALCITE-3468] JDBC adapter may generate casts on Oracle for varchar without the precision and for char with the precision exceeding max length of Oracle

Hi @wenhuitang, could you rebase the PR?

[CALCITE-3697] Implement BITCOUNT function

It's just a minor suggestion. This PR LGTM.

[CALCITE-3697] Implement BITCOUNT function

As Julian's comment in this JIRA, any consensuses on the function's name? I can see a discussion in [CALCITE-3732](https://issues.apache.org/jira/browse/CALCITE-3732).