[BitSail][Feature] Support generate constant value in FakeSource

[kyle-hawk]

Signed-off-by:

Pre-Checklist

Note: Please complete ALL items in the following checklist.

• I have read through the CONTRIBUTING.md documentation.
• My code has the necessary comments and documentation (if needed).
• I have added relevant tests.

Purpose

• close [BitSail][Feature] Support generate constant value in FakeSource. #244

Approaches

users can config constant value by defaultValue field, like this

      "columns": [
        {
          "name": "double_value",
          "type": "double",
          "defaultValue": "13.5"
        }
      ]

Related Issues

• close [BitSail][Feature] Support generate constant value in FakeSource. #244

New Behavior (screenshots if needed)

N/A

[lichang-bd]

It seems that the code is redundant. Why not combine fakeRawValue and constantRawValue into one function

[kyle-hawk]

thx for ur advice.
When I was writing, I also thought about whether to implement fakeRawValue and constantRawValue in one function, I thought fakeRawValue would be too long and hard to maintain for different logic mix together after combining, so I separated them, and the cost is that we got 2 functions that look similar

[lichang-bd]

After the merger, the code will be more concise, looking forward to your contribution @kyle-hawk

[kyle-hawk]

okay, thx for the guidance, I'll merge them

[kyle-hawk]

@lichang-bd I have merged them. please take a look. thx