How to build multiple dynamic set fields

[elielr01]

This might be more a question rather than a bug or feature request.

I have an scenario where I have a struct with 3 pointers like:

type MyStruct struct {
 A *string `json:"a"`
 B *string `json:"b"`
 C *string `json:"c"`
}

And I wanted to update a table adding dynamic sets based on whether if such pointers have value or not (without setting them to null).

I tried:

// decoded a MyStruct into "ms"

query := goqu.Update("table").Set(
  goqu.Record{
    "a": ms.A,
    "b": ms.B,
    "c": ms.C
  }
)

In case A has a value, but B and C are nil, this will populate column "table.a", but will also populate with NULL the columns "table.b" and "table.c" which is not what I want. In this case I would expect only A to be updated.

I also tried:

// decoded a MyStruct into "ms"
query := goqu.Update("table")

if ms.A != nil {
  query = query.Set(goqu.Record{ "a": ms.A })
}
if ms.B != nil {
  query = query.Set(goqu.Record{ "b": ms.B })
}
if ms.C != nil {
  query = query.Set(goqu.Record{ "c": ms.C })
}

But in case B and C have values, only C gets updated (the latest Set overrides previous Set statements, instead of being aggregated).

Ultimately the question is how to write an update query, having a struct, so that only the non-nil pointers are set? Or am I going for the wrong approach? 🙃