create view on Hive table: comment for each variable are lost - view

Question

I created a Hive table for which we added some description in the "comment" field for each variable as shown below:
spark.sql("create table test_comment (col string comment 'col comment') comment 'hello world table comment ' ")
spark.sql("describe test_comment").show()
+--------+---------+-----------+
|col_name|data_type| comment|
+--------+---------+-----------+
| col| string|col comment|
+--------+---------+-----------+
All is good and we see the comment "col comment" in the commennt field of the variable "col".
Now when I am creating a view on this table, the "comment" field is not propagated to the view and the "comment" column is empty:
spark.sql("""create view test_comment_view as select * from test_comment""")
spark.sql("describe test_comment_view")
+--------+---------+-------+
|col_name|data_type|comment|
+--------+---------+-------+
| col| string| null|
+--------+---------+-------+
Is there a way to keep the values of the comment field when created a view ? What is the reason of this "feature" ?
I am using:
Hadoop 2.6.0-cdh5.8.0
Hive 1.1.0-cdh5.8.0
Spark 2.1.0.cloudera1

Answer 1

What I have observed is that, comments are not inherited even when creating a table from another table. Looks like it is the default behaviour.
create table t1 like another_table
desc t1 //includes comments
+-----------+------------+------------------+--+
| col_name | data_type | comment |
+-----------+------------+------------------+--+
| id | int | new employee id |
| name | string | employee name |
+-----------+------------+------------------+--+
create table t1 as select * from another_table
desc t1 //excludes comments
+-----------+------------+----------+--+
| col_name | data_type | comment |
+-----------+------------+----------+--+
| id | int | |
| name | string | |
+-----------+------------+----------+--+
But there is a workaround. You can specify individual columns with comment when creating a view
create view v2(id2 comment 'vemp id', name2 comment 'vemp name') as select * from another_table;
+-----------+------------+------------+--+
| col_name | data_type | comment |
+-----------+------------+------------+--+
| id2 | int | vemp id |
| name2 | string | vemp name |
+-----------+------------+------------+--+