How and where the ElemDDLColDefault is converted into ElemDDLColDef ?

[Liu, Ming (Ming)]

Hi, Trafodion developers,

I am trying to figure out the code path of building the default value of column 
definition.

In the parser yacc file, the default value is treated as type 
ElemDDLColDefault, for example:

                      | builtin_function_user
                                {
                                  $$ = new (PARSERHEAP())
                                    ElemDDLColDefault(
                                       ElemDDLColDefault::COL_DEFAULT,
                                       $1 /*builtin_function_user*/);
                                }

And later in the code CmpSeabaseDDL::buildColInfoArray, it all uses 
ElemDDLColDef for a given column. I cannot find where the population of 
ElemDDLColDef is done.
I need to transfer some information from parser to later phases for semantic 
checking. Reading the code for a while, but no good progress, anyone know this 
will help me a lot.

I modified the ElemDDLColDefault with an error code which can easily detected 
at parse time. Later, in semantic checking can properly report this error, 
since in the parser production, it is very hard to know the column name, have 
to postpone the error report in later phases. But DDL is not DML, there is no 
clear Bind phase, so I am lost here.

Thanks,
Ming