SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function plus (alias d) (children 1)
     ExpressionList (children 2)
      Function grouping (children 1)
       ExpressionList (children 1)
        Identifier key_a
      Function grouping (children 1)
       ExpressionList (children 1)
        Identifier key_b
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 3)
           Function modulo (alias key_a) (children 1)
            ExpressionList (children 2)
             Function rand (children 1)
              ExpressionList
             Literal UInt64_10
           Function modulo (alias key_b) (children 1)
            ExpressionList (children 2)
             Function rand (children 1)
              ExpressionList (children 1)
               Function toLowCardinality (children 1)
                ExpressionList (children 1)
                 Literal UInt64_1
             Literal UInt64_5
           Identifier number
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Function numbers (children 1)
              ExpressionList (children 1)
               Literal UInt64_100
   ExpressionList (children 2)
    Identifier key_a
    Identifier key_b
 Identifier Null
