support delete

[veezhang]

Is your feature request related to a problem? Please describe.

Describe the solution you'd like

Describe alternatives you've considered

Additional context

[wey-gu]

delete was supported in last version with the label -, just in case it's not aware of.

cc @HarrisChu

[HarrisChu]

still doubt the user case...

[wey-gu]

still doubt the user case...

I actually had been seeing users asking about this(last night there is one, already).

I was thinking that you mentioned there are almost no users using it, but maybe not that few, and some users don't know it's possible as it's not highlighted enough in docs or so?

[veezhang]

The previous method required modifying the file, which is usually relatively large, and it is not suitable to modify it casually.
And now add mode in configuration file to support it now.
The default value is INSERT, optionally INSERT, UPDATE, DELETE.

[veezhang]

still doubt the user case...

This is what a customer delivery project needs, a temporary and urgent implementation.

[wey-gu]

This method(without needing modification on csv files)is more general to me,👍