SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 2)
    Identifier number (alias x)
    Function roundDown (children 1)
     ExpressionList (children 2)
      Identifier x
      Literal Array_[UInt64_0, UInt64_1, UInt64_2, UInt64_3, UInt64_4, UInt64_5]
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.numbers
   Literal UInt64_10