feat(cdc): Add MongoDB CDC Source

[StrikeW]

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What's changed and what's your intention?

1. Add mongodb-cdc connector to support capturing cdc events from MongoDB
2. Extend the DebeziumMongoJsonParser to handle message key, because we need to extract the _id field for DELETE event
3. Refactor cdc split implementation
4. User can use following query to ingest and capture collections in the dev database

CREATE TABLE test (
   _id varchar PRIMARY KEY,
   payload jsonb
) WITH (
   connector='mongodb-cdc',
   mongodb.url='mongodb://localhost:27017/?replicaSet=rs0',
   collection.name='dev.*'
);

Unit test and e2e tests will be added in follow up #15003

#14759

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Release note

• Add mongodb-cdc connector to support capturing cdc events from MongoDB

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[neverchanje]

Good job!

• I wonder if we support multiple mongodb addresses? It'd be common to have multiple mongodb nodes in real cases.
• Is FORMAT DEBEZIUM_MONGO ENCODE JSON; still needed for the new source?

[StrikeW]

Good job!

• I wonder if we support multiple mongodb addresses? It'd be common to have multiple mongodb nodes in real cases.

I think we do. The underlying debezium connector can support replica set and shared cluster deployment. User just need to provide the corresponding connection string to us:

• replica set
  mongodb://user:[email protected]:27017,mongodb1.example.com:27017,mongodb2.example.com:27017/?replicaSet=myRepl

• sharded cluster
  mongodb://user:[email protected]:27017,mongos1.example.com:27017,mongos2.example.com:27017/

• Is FORMAT DEBEZIUM_MONGO ENCODE JSON; still needed for the new source?

Yeah, we can omit it from the sql.

[neverchanje]

Please forbid unnecessary attributes in the final syntax, since a direct mongodb source does not require them.

[neverchanje]

Tried my best reviewing the code. Still some code to refine, but overall LGTM. Please find engineers to approve this PR.

[fuyufjh]

Recommend parsing all possible values (mongodb-cdc, postgres-cdc, mysql-cdc) to enum and use equal conditions here. This code looks too lossy, and it's hard to say what will happen if I pass some strange values ending with -cdc.

[StrikeW]

leave to the PR that adding e2e tests.

[StrikeW]

@fuyufjh @hzxa21 @tabVersion PTAL again, I‘d like to get the basic functionality merge first.

[fuyufjh]

Any motivation for this change? In what situation will it failed with error == null?

[StrikeW]

For defensive of nullptr and match the implementation of the following create(DbzConnectorConfig config, long channelPtr) method.
Actually newCdcEngineRunner only used in unit test right now, since we replaced with embeded jvm.

[fuyufjh]

LGTM. Thanks!