Support for view feature

[AndrewDi]

Feature Request

Is your feature request related to a problem? Please describe:

No
Describe the feature you'd like:

MySQL view feature compatibility
From now on, I have complete following function:

1. Create or Replace viename AS select statement
   ref MySQL Document Create or Replace VIEW
   create or replace view v as select a+199*0.5 from t;
   
2. show full ables grammar support view
   ref MySQL Document Show full tables
   show full tables
   
   3.show create table grammar support view
   ref MySQL Document show create table
   show create table v
   

Teachability, Documentation, Adoption, Migration Strategy:

Design Doc:
https://docs.google.com/document/d/1fzWxn9eqi4qwhS5KmIgQd-AhNt1J1HZfc4jf7HTSAzo/edit?usp=sharing

[shenli]

@AndrewDi Thanks!

[ghost]

I am going to close this issue now, as views are now available. Known issues are being tracked in #9798

Thanks!