SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 5)
   ExpressionList (children 2)
    Identifier CounterID
    Function uniq (children 1)
     ExpressionList (children 1)
      Identifier UserID
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier test.hits
   Function notEquals (children 1)
    ExpressionList (children 2)
     Literal UInt64_0
     Literal UInt64_0
   ExpressionList (children 1)
    Identifier CounterID
   Set