SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 2)
    Identifier CounterID
    Identifier dummy
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier merge_tree
   Function notEquals (children 1)
    ExpressionList (children 2)
     Identifier dummy
     Literal \'\'
   Literal UInt64_10