anchor.diff:  // Common
   
   partition_extension_clause
  -    : (SUBPARTITION | PARTITION) FOR? '(' expressions_? ')'
  +    : (SUBPARTITION | PARTITION) FOR? '(' expressions? ')'
       ;
   
   column_alias
  
positive.code: 
  pivot_in_clause_elements
      : expression
      | '(' expressions_? ')'
      ;
  
  unpivot_clause
  
negative.code:    | ROUND '(' expression (',' UNSIGNED_INTEGER)?  ')'
     | AVG '(' (DISTINCT | ALL)? expression ')'
     | MAX '(' (DISTINCT | ALL)? expression ')'
     | LEAST '(' expressions ')'
     | GREATEST '(' expressions ')'
     ;
  
  other_function
  