jingshanglu edited a comment on issue #3290: fix g4 for assignmentValueNode get 
error by index
URL: 
https://github.com/apache/incubator-shardingsphere/pull/3290#issuecomment-542592442
 
 
   > That maybe not enough because the expression may `values(xx) + values(xx)`.
   > So `VALUES` should be a part of expr
   
   ```
   assignmentRight_
       : VALUES LP_ assignmentValue RP_ | assignmentValue
       ;
   
   setAssignmentsClause
       : SET assignment (COMMA_ assignment)*
       ;
   
   assignmentValues
       : LP_ assignmentValue (COMMA_ assignmentValue)* RP_
       | LP_ RP_
       ;
   
   assignmentValue
       : expr | DEFAULT | blobValue
       ;
   ```
   @terrymanu 
   assignmentValue may be expr

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