anchor.diff:      //| match_expr
       | caseExpr
       | intervalExpr
  -    | privateExprOfDb
       ;
   
   functionCall
  
positive.code:     ;
  
  subquery
      : matchNone
      ;
  
  orderByClause
  
negative.code: 
  intervalExpr
      : INTERVAL expr ignoredIdentifier_
      ;
  
  variable
  