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From Roberta Marton <>
Subject RE: 答复: 答复: add a comment to a table
Date Fri, 01 Apr 2016 21:50:25 GMT
Thanks Ming for creating the JIRA.

There is a bit of work required to add this feature as Qifan pointed out
but overall fairly straight forward to implement.

It would be a good project for someone who wants to understand how
Trafodion DDL is implemented.

I have added some comments to the JIRA with my thoughts.


*From:* Liu, Ming (Ming) []
*Sent:* Friday, April 1, 2016 7:57 AM
*Subject:* 答复: 答复: 答复: add a comment to a table

Hi, Gunnar,

Yes, extend showddl will be a very good way to retrieve comments. QiFan is
proposing to write a UDF, Oracle seems to provide a system table with
comments, and user have to write a query to search in that system table.

Showddl will be a nice way, so we can add that capability as well.

I will update the jira and record this.

We can discuss more about the implementation and design in the JIRA. It is



*发件人**:* Gunnar Tapper [
*发送时间:* 2016年4月1日 21:58
*主题:* Re: 答复: 答复: add a comment to a table

Can you do the columns too while you're at it? Being able to embed
documentation is already a good thing. For example, we could document the
repository this way.

Also, do you plan to extend showddl to show the comments? Or, some other



On Fri, Apr 1, 2016 at 7:02 AM, Liu, Ming (Ming) <> wrote:

Very good plan QiFan.

Allow me file a JIRA then.

Compatibility will be important.



*发件人**:* Qifan Chen []
*发送时间**:* 2016年4月1日 18:31
*主题**:* Re: 答复: add a comment to a table

The implementation probably will be involving the following:

   1. add a new type for column TEXT_TYPE in meta-table
   2. allow COMMENT ON syntax in the parser;
   3. convert the content of COMMENT ON stmt into insertion/update of a
   row(s) in the TEXT meta-data table for the SQL object in question;
   4. write a UDF to show the comment easily for a SQL object, by hiding
   the join of the meta-data TEXT and OBJECTS table.

The task may be a little bit involving :-).

Thanks  --Qifan

On Fri, Apr 1, 2016 at 1:30 AM, Liu, Ming (Ming) <> wrote:

Shall we file a JIRA to track this requirement?



*发件人**:* Suresh Subbiah []
*发送时间**:* 2016年4月1日 11:54
*主题**:* Re: add a comment to a table


I do not think Trafodion currently supports Oracle's COMMENT ON syntax


*It will be a relatively simple feature to add but we do not have it today
as far as I know.*

*Thank you*


On Thu, Mar 31, 2016 at 9:56 PM, <> wrote:

Hi , all,

        I want to add a comment to a table,like the use of oracle"
comment on table tablename
is annotate", How to use jdbc way to implement it?



Regards, --Qifan




*If you think you can you can, if you think you can't you're right.*

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