SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function nullIf (children 1)
     ExpressionList (children 2)
      Function toNullable (children 1)
       ExpressionList (children 1)
        Function toDecimal32 (children 1)
         ExpressionList (children 2)
          Literal UInt64_1
          Literal UInt64_0
      Function toDecimal32 (children 1)
       ExpressionList (children 2)
        Literal UInt64_1
        Literal UInt64_0
    Function nullIf (children 1)
     ExpressionList (children 2)
      Function toNullable (children 1)
       ExpressionList (children 1)
        Function toDecimal64 (children 1)
         ExpressionList (children 2)
          Literal UInt64_1
          Literal UInt64_0
      Function toDecimal64 (children 1)
       ExpressionList (children 2)
        Literal UInt64_1
        Literal UInt64_0