[FEATURE] Derived data sources for selections and viewports

[philippjfr]

A ColumnDataSource has selection indices and ongoing work that @mattpap is doing will also allow masking a data source by the current viewport. It would be nice if these masks could be automatically reflected in a derived data source which can be used to generate another plot, which would then automatically reflect the current selection and/or viewport. In combination with a mechanism for expressing column transforms this could be a very powerful way of expressing linked selections entirely on the frontend without having to write custom Javascript.

[mytan310]

Hi, is anyone working on it? If not, I am interested and can complete it by the end of this month!

[bryevdv]

@mytan310 This is not a small task and intersects with many low-level aspects of BokehJS. Unless you already have a fleshed-out and detailed work-plan that you can share, this particular issue is better handled by the core team.

[mytan310]

Oh I see. This can be handled by the core team then. Thank you for the advice!