Feature request: Applying a shape filter (circle, polygon) to a dataview via carto.js 4

[jdgodchaux]

Cross posting CartoDB/carto.js#2237 , which appears to be a Windshaft feature request and not a carto.js feature request. Here is the original issue for context:

Context

A customer would like to apply a shape filter (circle, polygon) to a dataview. The customer believes that we can extend bounding box filtering to irregular polygons and circles. See their comments here:

the problem I’m facing is to apply a shape filter (circle, polygon) to a dataview. I’m aware you can change the sql on the source, but this affects how the layer is displayed. We need to have the layer unmodified on screen, then the user draws a shape, and some data from a dataview is returned based on that shape, without affecting the source. I opened this question on SO:

https://gis.stackexchange.com/questions/334156/apply-a-polygon-filter-to-cartojs-4-dataview

There is a way to achieve this through the dataviews?

Checking the carto 4.1.12-1, the line 19290 is where the code for boundingbox is declared. Probably will not be a huge enterprise to extend this to accept an array on lat/lngs. It is possible for your team to add this poly support? Or at least someone can guide me a little bit, so I can write the code to support the polygons? This is something very important for us. Later in the future a support for a circle would be great too.

Support Issue and Zendesk tickets for more context

CartoDB/support#2202