Vector Data visualize for Chat Data

[GITHUBear]

Description

Support chat data to visualize vector data:

1. Solve the NullType issue when OceanBase is used as the target database for chat data with vector tables
2. Use PCA to visualize vector data

How Has This Been Tested?

• Chat Data with OceanBase
• make test
• make mypy

Snapshots:

Include snapshots for easier review.

Checklist:

• My code follows the style guidelines of this project
• I have already rebased the commits and make the commit message conform to the project standard.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• Any dependent changes have been merged and published in downstream modules

[Aries-ckt]

meet some error when parse_vector_data_with_pca.
sample vector num =1

[GITHUBear]

Fix the error raised in parse_vector_data_with_pca, and enhance it with following test cases:

1. A vector table without vector rows -> 2d-scatter-plot will not be generated:

2. A table with 1d-vector (aka. scalar) -> 2d-scatter-plot will not be generated:

3. A table with 2d-vector, while only one record exists -> 2d-scatter-plot will not be generated:

4. A table with 2d-vector, and more than one records exist -> 2d-scatter-plot will be generated:

[Aries-ckt]

Test Success

[Aries-ckt]

LGTM

[csunny]

r+