SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 3)
    Function ifNull (children 1)
     ExpressionList (children 2)
      Literal NULL
      Function toDecimal32 (children 1)
       ExpressionList (children 2)
        Literal UInt64_3
        Literal UInt64_0
    Function ifNull (children 1)
     ExpressionList (children 2)
      Literal NULL
      Function toDecimal64 (children 1)
       ExpressionList (children 2)
        Literal UInt64_3
        Literal UInt64_0
    Function ifNull (children 1)
     ExpressionList (children 2)
      Literal NULL
      Function toDecimal128 (children 1)
       ExpressionList (children 2)
        Literal UInt64_3
        Literal UInt64_0