SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function minIf (children 1)
     ExpressionList (children 2)
      Identifier str
      Function notEmpty (children 1)
       ExpressionList (children 1)
        Identifier str
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier min_if