Github user robertamarton commented on a diff in the pull request:

    https://github.com/apache/incubator-trafodion/pull/760#discussion_r83069409
  
    --- Diff: docs/messages_guide/src/asciidoc/_chapters/ddl_msgs.adoc ---
    @@ -3044,3 +3044,146 @@ statement.
     *Recovery:* Remove the creation of triggers from the CREATE SCHEMA
     statement and resubmit. Create triggers in separate statements.
     
    +<<<
    +[[SQL-1420]]
    +== SQL 1420
    +
    +```
    +Column <column-name> cannot be dropped or altered as it is part of the 
table's primary key.
    +```
    +
    +*Cause:* You attempted to drop a column that is a part of a primary key.
    +
    +*Effect:* The operation fails.
    +
    +*Recovery:* Correct the column name or table name as appropriate and 
resubmit.
    +
    +[[SQL-1421]]
    +== SQL 1421 
    +
    +```
    +Column <column-name> cannot be dropped or altered as it is used in the 
secondary index <index-name>.
    +```
    +
    +*Cause:* You attempted to drop a column, but that column is used by the 
secondary index named.
    +
    +*Effect:* The operation fails.
    +
    +*Recovery:* If the secondary index is no longer needed, drop it and 
resubmit. If the column
    +name or table name are incorrect, correct them and resubmit.
    +
    +[[SQL-1422]]
    +== SQL 1422 
    +
    +```
    +An invalid HBase name was specified in this DDL statement. A valid name 
can only contain these characters: [a-zA-Z_0-9-.]
    +```
    +
    +*Cause:* You attempted to use a name containing an invalid character for a 
{project-name} object that is
    +stored in HBase.
    +
    --- End diff --
    
    I assume {project-name} gets changed to Trafodion during document rendering.


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