SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 1)
    Subquery (alias key_signed) (children 1)
     SelectWithUnionQuery (children 1)
      ExpressionList (children 1)
       SelectQuery (children 1)
        ExpressionList (children 1)
         Function currentDatabase (children 1)
          ExpressionList
   ExpressionList (children 2)
    Asterisk
    Function ignore (children 1)
     ExpressionList (children 1)
      Identifier key_signed
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function cluster (children 1)
       ExpressionList (children 4)
        Identifier test_cluster_two_shards
        Function currentDatabase (children 1)
         ExpressionList
        Identifier data_01756_signed
        Identifier key
   Function in (children 1)
    ExpressionList (children 2)
     Identifier key
     Literal Tuple_(Int64_-1, Int64_-2)
