Debezium - Custom Payload - MySQL Connector

Question

Im using Debezium to sync data from MySQL to S3. Now I want to make some changes.

Sample insert:

create table new (id int);
insert into new (1);

1. Custom Payload

{
    "schema": {
        "type": "struct",
        bla bla bla
        "optional": false,
        "name": "_72.31.84.129.test.new.Envelope"
    },
    "payload": {
        "before": null,
        "after": {
            "id": 10
        },
        "source": {
            "version": "0.10.0.Final",
            "connector": "mysql",
            "name": "11.11.84.129",
            "ts_ms": 1576605998000,
            "snapshot": "false",
            "db": "test",
            "table": "new",
            "server_id": 1,
            "gtid": "3a7b90e9-207e-11ea-b3ed-121a0cbac3cb:51",
            "file": "mysql-bin.000003",
            "pos": 12770,
            "row": 0,
            "thread": 47,
            "query": null
        },
        "op": "c",
        "ts_ms": 1576605998231
    }
}

I want to only push the payload option with some custom changes. I need to include the source,op,ts_ms are inside the payload.after.

Expected output:

{
            "id": 10, 
            "source": {
            "version": "0.10.0.Final",
            "connector": "mysql",
            "name": "11.11.84.129",
            "ts_ms": 1576605998000,
            "snapshot": "false",
            "db": "test",
            "table": "new",
            "server_id": 1,
            "gtid": "3a7b90e9-207e-11ea-b3ed-121a0cbac3cb:51",
            "file": "mysql-bin.000003",
            "pos": 12770,
            "row": 0,
            "thread": 47,
            "query": null
        },
        "op": "c",
        "ts_ms": 1576605998231
        }

I don't want schema, payload.before. Im not sure how to get this output.

Answer 1

Check out the SMT for extracting the new record state. It will only propagate what's in after. Optionally, you can let it add chosen field from source, too.

...
transforms=unwrap
transforms.unwrap.type=io.debezium.transforms.ExtractNewRecordState
transforms.unwrap.add.source.fields=table,lsn
...

You cannot insert the op and ts_ms fields atm., but they can be propgated as message headers.