liu ming created TRAFODION-1915:
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Summary: support adding/retrieving comments to SQL objects
Key: TRAFODION-1915
URL: https://issues.apache.org/jira/browse/TRAFODION-1915
Project: Apache Trafodion
Issue Type: New Feature
Reporter: liu ming
It is desired to have compatible capability of Oracle's syntax to add/get
comments to SQL objects, like tables and columns, etc.
QiFan give a very good initial design for this:
1. add a new type for column TEXT_TYPE in meta-table
TRAFODION."_MD_".TEXT, say COMMENT_TYPE;
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.
Can be done increamentally since there are a lot of SQL objects. And multiple
changes to different components.
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