Implement struct scanner

[asmyasnikov]

https://github.com/ydb-platform/ydb-go-sdk/blob/master/internal/query/scanner_struct.go#L20

[flymedllva]

How do I scan to optional values?

migration: name Text

StructScan result:

• cannot cast 'Test' (type 'Utf8') to '**string' destination
• cannot cast 'Test' (type 'Utf8') to '*sql.NullString' destination (maybe support https://github.com/guregu/null)

It would still be cool to support scanning in aliases to types, for example in generating enum from protobuf type TestEnum int32and JSON types in Go structure

[asmyasnikov]

How do I scan to optional values?

migration: name Text

StructScan result:

• cannot cast 'Test' (type 'Utf8') to '**string' destination
• cannot cast 'Test' (type 'Utf8') to '*sql.NullString' destination (maybe support https://github.com/guregu/null)

It would still be cool to support scanning in aliases to types, for example in generating enum from protobuf type TestEnum int32and JSON types in Go structure

you can define a pointer to type such as

var v *string
err := row.Scan(&v)

[flymedllva]

How do I scan to optional values? migration: name Text StructScan result:

• cannot cast 'Test' (type 'Utf8') to '**string' destination
• cannot cast 'Test' (type 'Utf8') to '*sql.NullString' destination (maybe support https://github.com/guregu/null)

It would still be cool to support scanning in aliases to types, for example in generating enum from protobuf type TestEnum int32and JSON types in Go structure

you can define a pointer to type such as

var v *string
err := row.Scan(&v)

The question was about StructScan, it doesn't work like that with it.