[FLINK-21998][hive] Copy more code from hive and move them to a dedicated package

[lirui-apache]

What is the purpose of the change

Copy more code from hive and move them to a dedicated package

Brief change log

• Move the copied hive classes to package org.apache.flink.table.planner.delegation.hive.copy
• Copy more hive code

Verifying this change

Existing tests

Does this pull request potentially affect one of the following parts:

NA

Documentation

NA

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Last check on commit 8f3bef8 (Sat Aug 28 11:08:38 UTC 2021)

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• ❓ 1. The [description] looks good.
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• ❓ 3. Needs [attention] from.
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• ❓ 5. Overall code [quality] is good.

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CI report:

• 8f3bef8 Azure: SUCCESS

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[twalthr]

@lirui-apache could you give the community more context about this change in the JIRA issue? I think most people in the Flink community would immediately reject copying more code from Hive to Flink unless there is a good reason for it.

[lirui-apache]

Hi @twalthr The copied code is used to support hive dialect for different hive versions. And also allows us to extend hive syntax to support more features in the future. It was discussed in the Support Multiple Hive Versions section of FLIP-152.

[twalthr]

@lirui-apache please always fill out the JIRA description. Even if it means copying the explanation from the FLIP. I got pinged to check this PR because it looks suspicious for people that are not familar with the topic.

[lirui-apache]

@twalthr Sure, will do.

[wuchong]

LGTM.