Mload - error treatment in DML label clause

Greetings Experts,
"When there are no expressions involved and at most one conversion required before
loading the data into the target table, the data conversion takes place in the acquisition
phase and the converted data is loaded into the worktable. This means that any errors with the data or with the conversion will be detected in the acquisition phase."
 
If there are expressions involved, which doesn't make conversion in acquisition phase, then will ET table be loaded with any rows at the end of acquisition phase?  If so, what kind of errors!
 
Does "IGNORE DUPLICATE ROWS" applicable to constraint violations or does we have error treatment options only to the entire DUPLICATE row.  Say, if I have a check constraint on a column abc to have only values 1,2,3.  If I update the column abc in the target that has a value of 3 with 55, will the record in the source be placed into UV table?
 
Also, does "IGNORE DUPLICATE ROWS" have effect on unique constraint violations (USI, primary key)?  Will the records that violate USI, primary key be logged into the UV table or ignored!