[Feature][Connector] Add connectors for these datasources

[davidzollo]

Based on analysis of market popularity, the following 9 database/storage connectors are suggested to be supported in SeaTunnel.

Database/Storage Connectors Tracking

Type	Connector	Contributer	Status	PR
Source/Sink	Azure Cosmos DB
Source/Sink	CockroachDB
Source/Sink	Amazon DocumentDB
Source/Sink	Firebase (Realtime Database)
Source/Sink	Couchbase
Source/Sink	Sybase
Source/Sink	Ingres
Source/Sink	SingleStore (MemSQL)
Source/Sink	Airtable

Context & Details

1. Azure Cosmos DB: Highly popular cloud-native database on Azure (NoSQL / Multi-model).
2. CockroachDB: Distributed SQL. Compatible with PostgreSQL wire protocol but dedicated connector allows optimized features.
3. Amazon DocumentDB: AWS managed document database (MongoDB-compatible).
4. Firebase (Realtime Database): distinct from the existing google-firestore connector.
5. Couchbase: Enterprise-grade NoSQL document store.
6. Sybase: Legacy RDBMS widely used in financial sectors.
7. Ingres: Heritage relational database system.
8. SingleStore (formerly MemSQL): High-performance real-time analytics database (HTAP).
9. Airtable: Low-code Database / Spreadsheet, popular as a data source.

[davidzollo]

If there is anybody who'd like to implement these connector features, please leave a related message like I'd like to implement XX and then you can submit your PR within four weeks.

A very kindly reminder: Other guys can pick it up if the related PR is not submitted within four weeks. ^-^

Here are some helpful resources to get started:

• Contribution Setup Guide
• Code Submission Guide

By the way, since this might be your first contribution, I think we can have a more in-depth communication to help you get familiar with SeaTunnel. Feel free to contact me on LinkedIn (David Zollo). When adding me, please let me know your GitHub ID. I'd be happy to assist you!

[DanielCarter-stack]

Thank you for the proposal. I've verified that these 9 connectors are indeed not currently present in the codebase:

Existing patterns that may help:

• Airtable: Can be built as an HTTP variant (similar to connector-http-feishu, connector-http-notion) by extending connector-http-base
• CockroachDB: Compatible with PostgreSQL wire protocol, so users can temporarily use the JDBC connector with PostgreSQL driver
• Sybase/Ingres: Generic JDBC connector (seatunnel-connectors-v2/connector-jdbc/) with corresponding drivers should work
• Amazon DocumentDB: May partially reuse MongoDB connector logic due to compatibility

Connectors requiring new implementations:

• Azure Cosmos DB, Firebase Realtime Database (different from existing connector-google-firestore), Couchbase, SingleStore

For community contributors, I suggest starting with Airtable (HTTP-based, lower complexity) or extending JDBC dialect support for CockroachDB/SingleStore. Please let us know which connector you'd like to prioritize, or if you need guidance on the implementation approach.

[kuleat]

I'd like to implement the Airtable connector.