feat: support tidb vector

[Weaxs]

Description

Close #4381

Support TiDB Vector for knowledge.

• add pymysql, pymysql 1.1.1 and tidb-vector 0.0.9

TiDB Vector doc: https://docs.google.com/document/d/15eAO0xrvEd6_tTxW_zEko4CECwnnSwQg8GGrqK1Caiw/edit

Fixes # (issue)

Type of Change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update, included: Dify Document
• Improvement, including but not limited to code refactoring, performance optimization, and UI/UX improvement
• Dependency upgrade

How Has This Been Tested?

VECTOR_STORE: tidb_vector
TIDB_VECTOR_HOST: xxxx.eu-central-1.xxxx.aws.tidbcloud.com
TIDB_VECTOR_PORT: 4000
TIDB_VECTOR_USER: xxxxxx.root
TIDB_VECTOR_PASSWORD: xxxxxx
TIDB_VECTOR_DATABASE: dify

Dify knowledge screenshot:

Tidb Cloud Chat2Qery screenshot:

• TODO
  update dify document for tidb vector https://github.com/langgenius/dify-docs

Suggested Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods
• optional I have made corresponding changes to the documentation
• optional I have added tests that prove my fix is effective or that my feature works
• optional New and existing unit tests pass locally with my changes

[JohnJyong]

pls add the TIDB deploy docker-compose file and the unit test for TIDB, thanks @Weaxs

[Weaxs]

pls add the TIDB deploy docker-compose file and the unit test for TIDB, thanks @Weaxs

TIDB vector feature is not open source currently, it will be opened at the end of year,
So it is only used by tidb cloud now and no mirrors for deploying. 🥲

[JohnJyong]

hi @Weaxs , sorry for replying to you so late, you can refer to tencent vector db’s unit test , commit below : https://github.com/langgenius/dify/pull/3568/files#diff-4c59736efdfdaff3b01f2ea5fe03ff75dbb1c5d767c16898d524e3d0d53467aa

[Weaxs]

hi @Weaxs , sorry for replying to you so late, you can refer to tencent vector db’s unit test , commit below : https://github.com/langgenius/dify/pull/3568/files#diff-4c59736efdfdaff3b01f2ea5fe03ff75dbb1c5d767c16898d524e3d0d53467aa

I have submitted api/tests/integration_tests/vdb/tidb_vector/test_tidb_vector.py in this PR.

Could you please review it when you have time, thx

[JohnJyong]

this will caused : TypeError: object of type 'NoneType' has no len()