[debezium] Improve convertToBinary for RowDataDebeziumDeserializeSchema

[gong]

dbzObj may be string when mysql cdc set with param 'debezium.binary.handling.mode' = 'base64'.
So add

if (dbzObj instanceof String) {
     String data = (String) dbzObj;
     return data.getBytes(StandardCharsets.UTF_8);
  } 

[gong]

@ruanhang1993 Hello, please help review it.

[gong]

The pipeline is TiDBE2eITCase exception. It is not relative with this PR.

[gong]

@leonardBang PTAL

[leonardBang]

Thanks @gong for the contribution, the change looks good to me, could you add a test for this change?

[gong]

Thanks @gong for the contribution, the change looks good to me, could you add a test for this change?
@leonardBang ok. I will add UT.

[gong]

@leonardBang I add an UT.

[leonardBang]

Thanks @gong for the explanation and ITCase, the code change part looks good to me.

Could you add parameter 'debezium.binary.handling.mode' = 'base64' to cdc connector option part of docs ? A short paragraph to describe the user case and parameter is recommended

[gong]

Thanks @gong for the explanation and ITCase, the code change part looks good to me.

Could you add parameter 'debezium.binary.handling.mode' = 'base64' to cdc connector option part of docs ? A short paragraph to describe the user case and parameter is recommended

@leonardBang Ok. I will add docs to decribe the user case

[leonardBang]

Thanks @gong for the update, LGTM . Will merge this PR once the CI green

[leonardBang]

The failed test is not related to current PR, merging.