SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 3)
    Identifier RegionID
    Function uniqExact (alias u1) (children 1)
     ExpressionList (children 1)
      Identifier UserID
    Function uniqUpTo (alias u2) (children 2)
     ExpressionList (children 1)
      Identifier UserID
     ExpressionList (children 1)
      Literal UInt64_10
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier test.visits
   ExpressionList (children 1)
    Identifier RegionID
   Function and (children 1)
    ExpressionList (children 2)
     Function lessOrEquals (children 1)
      ExpressionList (children 2)
       Identifier u1
       Literal UInt64_11
     Function notEquals (children 1)
      ExpressionList (children 2)
       Identifier u1
       Identifier u2