feature(planner): Introduce serializable physical plan

[leiysky]

I hereby agree to the terms of the CLA available at: https://databend.rs/dev/policies/cla/

Summary

Introduce a serializable physical plan, which is similar to PlanNode but without Expression inside.

Also support result set with duplicated column names as:

mysql> select 3 as a, 4 as a;
+------+------+
| a    | a    |
+------+------+
|    3 |    4 |
+------+------+
1 row in set (0.01 sec)
Read 1 rows, 1.00 B in 0.002 sec., 523.95 rows/sec., 523.95 B/sec.

Changelog

• New Feature

Related Issues

Close #6081

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Name	Status	Preview	Updated
databend	✅ Ready (Inspect)	Visit Preview	Jun 24, 2022 at 10:50AM (UTC)

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[leiysky]

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[mergify]

update

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