InsertQuery   (children 2)
 Identifier summing_mt_aggregating_column
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 1)
    ExpressionList (children 4)
     Literal UInt64_1
     Literal UInt64_3
     Literal Array_[UInt64_555, UInt64_999]
     Function groupArrayArrayState (children 1)
      ExpressionList (children 1)
       Function array (children 1)
        ExpressionList (children 2)
         Function toUInt64 (children 1)
          ExpressionList (children 1)
           Literal UInt64_55
         Function toUInt64 (children 1)
          ExpressionList (children 1)
           Literal UInt64_99
