Tracking issue for codec interface type assertion failed

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What did you do?

When creating a changefeed with Kafka sink, the codec will be used to encode RowChangedEvent into a message. At the moment, TiCDC support several different codec protocols, we should make sure all protocol can handle the content of RowChangedEvent correctly, especially the Column.Value field, which is an interface.

What did you expect to see?

All protocols can handle Column.Value field correctly, but some failed.

What did you see instead?

The server panic.

Versions of the cluster

Upstream TiDB cluster version (execute SELECT tidb_version(); in a MySQL client):

Most recent bug report happened in v5.4.0, but we should check all release branches.

Related issues

Canal-JSON / Canal

• cdc mounter encode default value for unsigned into string, cause canal-json panic. #4635
• canal_json don't support nil value for uint64 #4736

Open protocol

• json codec met panic: interface conversion: interface {} is string, not []uint8 #2758

test

• add unsigned to integration test #4787