Returning JSON into json.RawMessage reported error: unsupported Scan

[shelly-li-sl]

Returning JSON into JSON.RawMessage reports the following error:

===Error:
2025/10/23 01:11:00 /scratch/shulili/GORM/gorm-github/gorm-oracle/tests/json_edge_cases_test.go:189 sql: Scan error on column index 1, name "doc": unsupported Scan, storing driver.Value type godror.JSON into type *json.RawMessage
[1.007ms] [rows:1] SELECT * FROM "returning_records" WHERE "record_id" = 1
json_edge_cases_test.go:190: returning into RawMessage failed: sql: Scan error on column index 1, name "doc": unsupported Scan, storing driver.Value type godror.JSON into type *json.RawMessage

===Code snapshot:

type ReturnedRaw struct{ Doc json.RawMessage }
	var retRaw ReturnedRaw
	if err := DB.
		Clauses(clause.Returning{Columns: []clause.Column{{Name: "doc"}}}).
		Model(&ReturningRecord{}).
		Where(`"record_id" = ?`, record.ID).
		Update("doc", gorm.Expr(`JSON_TRANSFORM("doc", SET '$.n' = 3)`)).
		Scan(&retRaw).Error; err != nil {
		t.Fatalf("returning into RawMessage failed: %v", err)
	}

===Full test case can be found in json_bulk_2_test.go(TestJSONReturning)

[aarrasseayoub01]

For this, I'm not sure, but the only way I see is to implement a Value() function at the level of godror.JSON() and make sure it returns []byte. This way it can be converted to jsonRawMessages