SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 3)
    Function ifNull (children 1)
     ExpressionList (children 2)
      Literal NULL
      Function toNullable (children 1)
       ExpressionList (children 1)
        Function toDecimal32 (children 1)
         ExpressionList (children 2)
          Literal UInt64_4
          Literal UInt64_0
    Function ifNull (children 1)
     ExpressionList (children 2)
      Literal NULL
      Function toNullable (children 1)
       ExpressionList (children 1)
        Function toDecimal64 (children 1)
         ExpressionList (children 2)
          Literal UInt64_4
          Literal UInt64_0
    Function ifNull (children 1)
     ExpressionList (children 2)
      Literal NULL
      Function toNullable (children 1)
       ExpressionList (children 1)
        Function toDecimal128 (children 1)
         ExpressionList (children 2)
          Literal UInt64_4
          Literal UInt64_0