danny0405 opened a new pull request #8850: [FLINK-12954] Supports watermark and 
create view for sql parser
URL: https://github.com/apache/flink/pull/8850
 
 
   ## What is the purpose of the change
   
   - Add watermark grammar like `WATERMARK watermark_name FOR col_name AS 
BOUNDED WITH DELAY 1000 SECOND`
   - Add create view grammar like `CREATE VIEW view_name(col1, col2) WITH(k1 = 
v1, k2 = v2) AS select col3, col4 from tbl`
   
   ## Brief change log
   
     - Add watermark for create table ddl
     - Add create/drop view
   
   
   ## Verifying this change
   See tests in FlinkSqlParserimplTest.
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): no
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: no
     - The serializers: no
     - The runtime per-record code paths (performance sensitive): no
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: no
     - The S3 file system connector: no
   
   ## Documentation
   
     - Does this pull request introduce a new feature? yes
     - If yes, how is the feature documented?  not documented
   

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